All tools

Merge PDF

Combine two or more PDF files into one document in the order you choose.

Split PDF

Split one PDF into separate files by page or by the ranges you type.

Organize PDF Pages

Reorder, rotate, duplicate and delete the pages of one PDF, then download a copy.

PDF

Extract PDF Pages

Save the pages you pick from a PDF as their own new PDF file.

PDF

Rotate PDF

Turn every PDF page or just the pages you name, without changing their order.

Crop PDF

Preview a PDF page, adjust its crop box or use equal margins, and download a copy.

Multiple PDF Pages per Sheet

Place several PDF pages on one sheet in reading order and download the arranged copy.

PDF Page Size Converter

Rebuild every page of a PDF at a standard paper size and download the resized copy.

Remove Blank Pages from PDF

Review near-white page estimates, then remove only the flagged pages you explicitly select from a PDF copy.

PDF Bookmark Editor

Inspect supported PDF outlines and replace them with an entered page bookmark tree.

PDF to Images

Render PDF pages as PNG or JPG images at the resolution you pick.

PDF to Text

Read the text layer a PDF already stores and download it as a plain text file.

JPG

PDF to JPG

Render PDF pages as JPG images in your browser at the resolution you set.

Compare PDF and Word Text

Read the selectable text of two PDFs or Word documents and see what changed between them.

Extract Images from PDF

Export supported embedded raster images from a local PDF with a transparent compatibility report.

PDF to Markdown

Export readable PDF text to reviewable Markdown with approximate headings, lists and paragraph grouping.

PDF to HTML

Convert readable PDF text into an escaped offline HTML document with approximate reflowable structure.

PDF to Word Text Draft

Turn horizontal stored PDF text into editable DOCX paragraphs with explicit layout limits.

PDF Text Table to XLSX

Assign horizontal PDF text to user-defined column boundaries and export a reviewable XLSX table.

Images to PDF

Place JPEG, PNG or WebP images into one PDF, one image per page.

Word to PDF

Convert a DOCX document into a PDF using an isolated converter.

Text to PDF

Turn pasted text or a plain .txt file into a paginated PDF with your choice of page and font.

CSV to PDF

Lay a flat CSV table out as a PDF with the column names repeated on every page.

Invoice and Receipt Maker

Build an invoice or receipt from your own line items and tax rate, then download the PDF.

Resume Builder

Fill in your own sections and download a plain one to three page PDF resume built in your browser.

Printable Paper Generator

Make ruled, graph or dot-grid paper as a PDF, with the page size, spacing, margin and line color you choose.

Markdown to PDF

Render supported Markdown headings, lists, code and simple tables into a paginated PDF.

XLSX Sheet to PDF

Print a selected XLSX cell rectangle as a paginated PDF table using stored cell values.

EML Email to PDF

Save supported email headers and plain-text MIME content as a PDF without opening attachments or remote assets.

EPUB Text to PDF

Make a paginated PDF from supported unencrypted EPUB 3 spine text without running scripts or loading assets.

Photo Proof Sheet PDF

Arrange local photos as fitted thumbnails with captions on an A4 or Letter PDF proof sheet.

Add Page Numbers to PDF

Stamp page numbers onto the pages you choose and download a numbered copy.

Add Watermark to PDF

Draw a text or PNG watermark on the pages you choose and download a marked copy.

Sign PDF

Place a typed name, hand drawing or PNG signature on one PDF page in your browser.

PDF Metadata Editor

Read the title, author, subject, keywords and creator a PDF stores, then export a copy with the values you set.

Grayscale PDF

Render the pages you choose in grayscale and rebuild the document as a PDF of images.

Fill PDF Form

Type values into the fields of a standard PDF form and download a filled copy.

Flatten PDF Forms

Fix the values of a PDF form into the page and remove the interactive fields.

Add Header and Footer to PDF

Stamp running text above or below PDF pages with page, total-page and entered-date placeholders.

Add Bates Numbering to PDF

Add sequential Bates labels with a prefix, padded number and suffix to selected PDF pages.

PDF Inspector

Read supported PDF page dimensions, rotation, metadata and declared font or image resource counts.

PDF Attachment Manager

Inspect, add and extract supported document attachments without opening embedded files.

Annotate PDF

Add visual highlights, boxes, arrows and text notes to entered PDF page positions.

Compress PDF

Rebuild a PDF's internal structure to save space without re-encoding page content.

Image Compressor

Shrink JPEG, PNG and WebP files with quality and color settings you control.

Image Resizer

Resize JPEG, PNG and WebP images to fit, fill or exact dimensions.

JPG

Compress JPEG

Re-encode JPEG photos at the quality you choose, in your browser.

PNG

Compress PNG

Shrink PNG screenshots and graphics by reducing their color count.

Social Media Image Resizer

Fit a picture onto a square, portrait, story or widescreen frame in your browser.

Image Format Converter

Convert JPEG, PNG and WebP images between the three formats.

JPG

PNG to JPG

Convert PNG images to JPG and choose which color replaces the transparent pixels.

PNG

JPG to PNG

Convert JPG photos to PNG files without changing their pixel size.

JPG

WebP to JPG

Turn WebP images into JPG files for programs that do not open WebP.

HEIC to JPG

Convert HEIC and HEIF photos to JPG in your browser and choose the color behind transparent pixels.

PNG

WebP to PNG

Convert WebP images to PNG and keep their transparent areas.

WebP

Convert to WebP

Convert JPG and PNG images to WebP and compare both file sizes.

PNG

HEIC to PNG

Turn HEIC photos into PNG files in the browser without uploading them or creating an account.

SVG to PNG Converter

Turn one SVG drawing into a PNG at the width you choose, with a transparent or solid background.

Image to ASCII Art

Sample an image into a grid of ASCII characters with a chosen width and brightness direction.

GIF Frame Extractor

Extract selected GIF frames as PNG images with native browser decoding and disposal handling.

PSD Preview Converter

Decode a supported flattened PSD composite and export a PNG or JPEG preview locally.

Multi-page TIFF Converter

Extract selected pages from supported classic TIFF files into separate PNG images.

PNG to SVG Vectorizer

Trace selected dark or light PNG pixels into monochrome SVG paths while preserving holes and transparency.

Image Cropper

Crop an image with a movable rectangle, thirds grid, fixed ratio or print-size ratio.

Rotate and Flip Image

Turn or mirror one JPEG, PNG or WebP image and save the result.

Watermark Image

Draw one text or logo watermark across up to 20 images and download them.

Canvas Padding and Square Fit

Fit an image on a canvas and add solid, rounded or patterned frames with padding.

Image Splitter

Split an image into PNG grid tiles or a printable A4 or Letter poster PDF.

Image Stitcher

Join 2 to 10 images into one row or one column in the order you set.

Round Corners and Circle Crop

Give an image rounded corners or an elliptical mask and export it with a transparent outside.

Add Text to Image

Caption a photo, add an entered date stamp or create a text-only image card.

Meme Generator

Add a top and a bottom caption with an outline to a picture, then download the copy.

Trim Image Whitespace

Crop the empty border from a JPEG, PNG or WebP image and keep the part that has content.

Blur, Pixelate and Redact Image

Blur, pixelate or cover parts of a photo, and see which option replaces the pixels with an opaque colour.

Photo Collage Maker

Arrange two to ten photos in a square grid with crop or fit, gaps, a background colour and optional file-name captions.

Photo Filters and Effects

Adjust brightness, contrast, saturation and warmth, then apply grayscale, sepia or invert to one photo.

Image Comparison Tool

Place two images side by side and mark changed pixels in a third panel, including differences in transparency.

Image Sprite Sheet Builder

Pack two to twenty images into one unscaled PNG atlas and export matching JSON coordinates and CSS classes.

Image Sharpness Adjustment

Adjust edge contrast with bounded sharpness and threshold settings, then compare the original and output.

Image Overlay and Blend

Place a second image over a base with explicit opacity, blend mode and fit settings, then export PNG.

Signature Image Cleaner

Keep dark strokes from a signature image and replace its light background with white or transparency.

Screenshot Beautifier

Place a screenshot inside a plain or browser-style frame with an entered background and padding.

Device Mockup Generator

Fit an image into a simple phone or laptop frame and export the combined mockup as a PNG.

Image to Pixel Art

Sample an image into a coarse grid, then enlarge its square cells with your chosen colour palette.

Photo Mosaic Maker

Match uploaded tile photos to regions of a target picture to create a bounded photo mosaic.

Screenshot Annotation Tool

Add and edit ordered arrow, box, text and blur annotations on a local screenshot.

Image Perspective Warp

Map an image into four entered corners using a bounded perspective transform.

Image Seamless Tile Preview

Preview neighboring repeats of a texture and export a bounded tiled sample.

Camera Lens Distortion Corrector

Adjust a manual radial distortion model and review the resampled image before export.

Document Scanner

Rectify four entered document corners and apply a grayscale or threshold finish.

Image Noise Reduction

Apply a bounded median filter and blend amount while reviewing image detail loss.

US Passport Photo Crop and Print

Position a manual square photo crop with head guides and download a clean PNG plus a US passport-size print sheet.

Colour Picker from Image

Read the color of any pixel in an image and copy its HEX, RGB, HSL and alpha values.

Image Metadata Manager

Inspect the camera, date and GPS fields a JPEG carries, then remove, replace or correct them.

JPG

Remove EXIF Metadata

Remove the listed JPEG metadata, including GPS, without re-encoding the picture.

Image Palette Extractor

Extract representative image colors and download a palette as JSON, CSS variables or a PNG strip.

Image Colour Replacement

Replace pixels near a chosen colour with a new RGB colour, keeping their original transparency.

Image Histogram and Exposure Inspector

Count image colour and approximate luma bins, with transparency handling and endpoint observations.

Image Transparency Inspector

Inspect alpha groups and supported hidden PNG colour values, with light and dark background previews.

Change Image DPI

Set a PNG print-density value, or resize an image to an entered print width while keeping its proportions.

Duplicate Photo Finder

Compare local photos for exact-byte matches and bounded perceptual similarity pairs.

Image Quality and Blur Checker

Measure a bounded blur estimate and dark/light pixel fractions for manual image review.

PDF to Images

Render PDF pages as PNG or JPG images at the resolution you pick.

Images to PDF

Place JPEG, PNG or WebP images into one PDF, one image per page.

Color Picker and Converter

Pick a color or enter a HEX, RGB or HSL value, then copy the equivalent formats.

Contrast Checker

Check text and background colors against WCAG 2.2 contrast thresholds.

Favicon Generator

Make favicon files and a web app icon from one image, ready to add to your site.

Word Counter

Count words and characters, or compare a draft with a character length guide.

Readability Score

Estimate the English reading level of your text with six formulas.

Typing Speed Test

Type a passage against a real timer and read your gross and net words per minute and character accuracy.

Abbreviation Glossary Builder

Build a glossary from supplied definitions and review abbreviation uses and unexplained uppercase tokens in a document.

Unicode Code Point Inspector

Inspect Unicode code points, encoded bytes and pinned names, blocks and scripts locally.

Syllable Counter

Count syllables from recorded pronunciations and show alternate counts and unknown words separately.

Remove Duplicate Lines

Remove repeated lines from a list while keeping the order you pasted.

Find and Replace Text

Replace literal text throughout a document, with whole-word matching and case control.

Remove Extra Spaces and Line Breaks

Clean text copied from a PDF, email or web page by fixing repeated spaces, broken lines and stray tabs.

Online Notepad

Write a note that stays in this browser, then export or delete it.

Line Numbering Tool

Add line numbers, remove a matching number prefix or renumber pasted text with a chosen starting value.

Column Aligner for Text

Pad delimiter-separated text into readable columns using an explicitly selected separator.

Text Encoding Fixer

Repair supported UTF-8 mojibake by explicitly reinterpreting Latin-1 or Windows-1252 characters.

Text Cleaner

Apply selected text cleanup operations while keeping a visible record of the choices you made.

Hard Wrap Text

Insert line breaks at an entered character width, with an explicit choice for long words.

Text Alignment and Justification Tool

Wrap plain-text paragraphs to a chosen width, then align them left, right, center or with full justification.

Dialogue Script Formatter

Arrange entered speaker lines and stage directions into a readable script with plain-text and printable PDF exports.

Markdown Preview and Formatter

Preview supported Markdown structures and normalize their source formatting locally.

Text Case Converter

Change the capitalization of your text to any of thirteen case styles.

Sort Lines

Sort lines by alphabetical, numeric or length order, with control over case, blanks and direction.

Reverse Text

Reverse text by visible character, whole word or whole line.

Morse Code Translator

Encode or decode International Morse code, then play it on demand.

Text Splitter and Line Joiner

Split text at a delimiter or by character count, or join lines.

Fancy Text Generator

Turn Latin letters into decorative Unicode styles for short labels and bios.

Word Search Puzzle Generator

Turn your own word list into a printable word search PDF, with a chosen grid, direction set and optional answer key.

NATO Phonetic Alphabet Converter

Spell letters as NATO alphabet words while keeping word and line breaks in the converted text.

Text Cipher Tool

Explore ROT13, Caesar and Vigenere transformations using ASCII letters and an entered shift or key.

Word Prefix and Suffix Tool

Add an entered prefix, suffix or both to each line while keeping the list order and explicit empty-line choices.

DOCX to Markdown

Convert supported DOCX text structures to Markdown and extract supported embedded image bytes.

Text to Handwriting Converter

Render supported text in the bundled Caveat handwriting font as bounded lined PNG pages.

HTML to Markdown Converter

Convert supported HTML headings, paragraphs, lists and links to Markdown without loading page resources.

Text Compare

Compare two pieces of text and see exactly what was added or removed.

Lorem Ipsum Generator

Generate placeholder Latin text by paragraph, sentence or word.

Numbers to Words Converter

Write a number in English words, with the US or British wording for and.

Text Repeater

Repeat entered text with a chosen separator and optional sequence numbers, within a checked output limit.

Text Footnote and Endnote Builder

Renumber entered footnote references by first appearance and export matching Markdown or escaped HTML.

Special Character and Symbol Picker

Find a named symbol in a curated Unicode subset, append it to your text and copy the exact character.

Word Cloud Generator

Count words in entered text and arrange a bounded word cloud with color and size controls.

Random Name Generator

Combine original name components into character names, usernames or labeled placeholders.

ASCII Banner Text Generator

Render supported text using an original bitmap alphabet with filled or outline banner styles.

Crossword Puzzle Generator

Arrange entered answers and clues into a connected printable crossword with a separate answer key.

Word Finder and Unscrambler

Find anagrams, rack words or pattern matches in a pinned US English pronunciation vocabulary.

Rhyme Finder

Find pronunciation-based rhymes and clearly labeled near-rhyme candidates in a pinned CMU vocabulary.

Citation Draft Generator

Build APA 7 or MLA 9 reference drafts for a book or webpage from the metadata you enter.

Mail Merge DOCX Letters

Fill a plain-text letter template from CSV rows and download one DOCX letter per row in a ZIP.

Text to PDF

Turn pasted text or a plain .txt file into a paginated PDF with your choice of page and font.

Compare PDF and Word Text

Read the selectable text of two PDFs or Word documents and see what changed between them.

Subtitle Converter

Convert supported plain-text SRT, WebVTT and ASS cues with explicit timing and loss rules.

Subtitle Editor and Sync Shifter

Edit supported subtitle cue text and timing, then shift the sequence by an explicit offset.

Subtitle Quality Checker

Flag subtitle overlaps, ordering and entered readability thresholds in a local SRT or WebVTT file.

Audio Trimmer and Cutter

Trim a bounded PCM WAV by entered times, preview its waveform and export a new WAV.

Audio Joiner

Join ordered compatible PCM WAV files with an optional bounded crossfade.

Audio Volume Booster and Normalizer

Adjust WAV gain or sample-peak normalization with explicit clipping prevention.

Audio Speed and Pitch Changer

Change a supported WAV playback rate with linked duration and pitch, then export PCM WAV.

Local Video Audio Extractor

Record the confirmed audio track from a short supported local video into browser-generated WebM audio.

Audio to PCM16 WAV

Decode supported short local audio and save a real 48 kHz PCM16 WAV with mono or stereo channel handling.

MP3 ID3 Metadata Editor

Inspect supported MP3 text tags or replace them with a small ID3v2.3 tag while retaining audio frame bytes.

Audio Spectrogram Analyzer

Plot a WAV recording by time and frequency, then export the selected view and amplitude data.

Audio Loudness and True-Peak Meter

Measure integrated and short-term loudness and estimated true peak in a 48 kHz WAV.

Multitrack Audio Mixer

Mix ordered WAV tracks with individual offsets, gains and mute controls into one WAV.

Stereo Channel Splitter and Router

Split a stereo WAV into two mono files or map either input channel to a new stereo output.

Reviewed Audio Silence Remover

Find quiet WAV regions, review their cut IDs and render only the cuts you approve.

Audio Gain Envelope Editor

Shape WAV volume over time with a reviewed list of time and gain points.

Parametric Audio Equalizer

Apply named peaking EQ bands to a WAV and inspect the combined response before saving it.

Audio Dynamics Processor

Apply a linked-channel gate and compressor to a WAV, then review the gain-reduction report.

Monophonic Pitch and Tuner Analyzer

Estimate note pitch and cents from a mono WAV containing one clear note at a time.

Audio Loop-Point Finder

Compare sample-boundary loop candidates around entered markers and audition the chosen region.

CUE Audio Track-Sheet Builder

Build a CUE sheet and reviewed track timeline that reference one local WAV recording.

Video Frame Extractor

Extract local video frames at entered times and download bounded PNG stills.

Browser Video to WebM

Re-record a short supported local MP4, MOV-family or WebM clip as a bounded WebM video.

Browser Video Compressor

Re-record a video with chosen dimensions and requested bitrate, then compare the actual file sizes.

Browser Video Trimmer

Re-record a selected short interval from a local supported video and download the resulting WebM clip.

Images to Video Slideshow

Turn an ordered set of local images into a short silent WebM slideshow with a chosen fit and background.

Browser Video Joiner

Re-record two or three supported local clips in order as one short WebM video with bounded output dimensions.

Video Resize and Crop

Resize or center-crop a short local supported video into a bounded WebM with explicit output dimensions.

Video Speed Changer

Re-record a short local clip at a supported playback rate and download a WebM with explicit timing limits.

Video Rotate and Flip

Rotate or mirror decoded frames of a local video and save a re-recorded WebM output.

Remove Audio from Video

Re-record a short supported local video as a WebM containing a video track and no audio track.

Subtitle Burn-In Composer

Burn reviewed plain subtitle cues into a local video and save a captioned WebM.

Video Soundtrack Replacement and Mixer

Replace, mix or remove short-video sound using a local WAV with a reviewed offset and gain.

Picture-in-Picture Video Composer

Place a timed inset video over a short base clip and choose one source for the output sound.

Timestamped Video Storyboard

Sample local video frames at entered intervals and export a timestamped sheet and frame list.

Media Container and Codec Inspector

Inspect declared tracks and codec identifiers in a bounded media container without playing it.

Bilingual Subtitle Alignment Workbench

Review timed matches between two subtitle languages before exporting paired captions.

Video Calibration Clip Generator

Generate a short flash-and-beep WebM with a disclosed event schedule for manual playback checks.

Animated Title-Card Composer

Render timed local text layers with selected entrance effects into a short WebM title sequence.

Audio and Video Event-Offset Measurer

Compare manually entered visible and audible event markers with frames and a decoded waveform.

Browser Audio Recorder

Record a short microphone clip after an explicit Start action and save the browser recording locally.

CSV Viewer

Filter CSV rows with conditions, sort by several columns and download every matching row.

CSV Cleaner

Apply chosen cleanup rules to a CSV and download the result.

CSV Merge and Join

Join two CSV, TSV or Excel tables on one or more key columns and download the combined rows.

CSV Diff and Change Report

Compare two CSV versions by a key column and report added, removed and changed rows.

Dataset Profiler

Describe each column of a CSV file with a guessed type, blanks, unique values and samples.

Pivot Table Builder

Group a CSV by one column and sum, average, count, or take the smallest or largest value of another.

CSV Splitter

Split one CSV into several files by row count or by a column value, and download the parts.

Chart Builder from Data

Turn a pasted or uploaded CSV or TSV table into a bar, line or pie chart and save it as a PNG.

Column Split and Combine

Split one CSV column into several by a separator or a fixed width, or join columns into one.

Dataset Unpivot Tool

Turn a wide table into a long one by repeating the identifier columns and moving chosen value columns into rows.

Transpose Rows and Columns

Flip a CSV table so columns become rows and rows become columns, with the first line of the result explained.

Data Quality Rule Checker

Check a CSV against required, unique, range, length and pattern rules, then download the rows that fail.

Multi-File CSV Concatenation

Stack selected CSV records in file order, align their headers and review the row count from every input file.

Dataset Row Sampler and Splitter

Select rows reproducibly or split a CSV into disjoint parts, preserving source order within each exported table.

Data Reconciliation Report

Compare unique key sets and selected control totals across two CSV tables, without row-level differences.

Row Upsert Between Two Datasets

Replace matching CSV records from an update table, append new keys and export an action record alongside the result.

Person Name Splitter and Normalizer

Split supplied names using an explicit token or comma rule, optionally adjust capitalization and export a review table.

Number Column Formatter

Format one selected numeric CSV column with explicit source separators, output locale and decimal or currency settings.

Text Encoding and Delimiter Inspector

Inspect a local text file for supported encoding evidence, line endings and quote-aware delimiter candidates.

Dataset Column Mapper

Map source columns to an explicit target schema and export a reordered CSV with a reusable mapping profile.

Duplicate Records Across Files

Compare two CSV datasets for exact keys and separately labeled similarity candidates.

Synthetic Test Dataset Generator

Generate repeatable, explicitly fake rows from an entered bounded test-data schema.

Contact Field Validator and Formatter

Review contact columns in CSV while retaining originals and marking syntax or normalization issues.

CSV Date Format Converter

Rewrite dates in one named CSV column using explicit input and output date formats.

CSV/JSON Converter

Convert a flat table between delimited text, JSON, XML and an Excel workbook.

Table Format Converter

Convert tables between CSV, TSV, Markdown, HTML and JSON, with escaped text and alignment controls.

Bulk File Renamer

Rename copies of several files from one pattern and download them as a ZIP.

Nested JSON to Flat Table

Flatten nested JSON into a CSV table with one row per record and a column for every field it finds.

Fixed-Width File to CSV Parser

Extract typed column ranges from fixed-width text and inspect unmapped content before exporting a delimited table.

CSV to vCard Contact Converter

Map contact CSV columns to a UTF-8 vCard 4 file with escaped values and byte-aware line folding.

Table to SQL Insert Generator

Turn a bounded table into quoted SQL insert or upsert statements using explicit column types and a selected dialect.

SQL Schema to Data Dictionary

Inspect supported CREATE TABLE statements and export column types, defaults and constraints as a data dictionary.

Spreadsheet Formula Generator

Build a spreadsheet formula from plain controls for the operation, A1 ranges and conditions.

Spreadsheet Formula Error Decoder

Explain a recognized spreadsheet error and review general causes and next checks.

Excel Workbook Inspector

Inspect XLSX sheets, formulas, merged ranges, hidden cells and defined names without evaluation.

Spreadsheet Formula Dependency Visualizer

Map supported static XLSX formula references and report cycles and unresolved references.

Spreadsheet Formula to Pandas Converter

Translate a bounded scalar spreadsheet formula into inspectable Pandas code using entered column mappings.

Country, Currency and Language Code Lookup

Search pinned ISO country, currency and language code tables without inferring relationships.

CSV and XLSX Converter

Convert one CSV table to XLSX or export stored values from a selected worksheet rectangle as CSV.

YAML and JSON Converter

Convert one YAML document to JSON, or turn JSON into YAML, in your browser.

CSV to PDF

Lay a flat CSV table out as a PDF with the column names repeated on every page.

JSON to TypeScript

Generate TypeScript, Zod, Go, Python or PHP models from a JSON or CSV sample.

JSON Formatter and Validator

Validate, format or minify JSON, and explore objects with collapse and depth controls.

XML Formatter

Format, minify or check one XML document using the browser's XML parser.

YAML and JSON Converter

Convert one YAML document to JSON, or turn JSON into YAML, in your browser.

SQL Formatter

Reformat SQL text with a selected dialect and keyword case in your browser.

JSON to TypeScript

Generate TypeScript, Zod, Go, Python or PHP models from a JSON or CSV sample.

Code Beautifier

Format JavaScript, TypeScript, JSON, CSS, HTML, Markdown or YAML with your choice of indentation and line width.

JSON Diff and Patch

Compare two JSON documents and get the RFC 6902 patch that turns the first into the second.

Streaming NDJSON Validator

Check a JSON Lines file line by line in the browser and report the physical line of every broken record.

Unified Patch Inspector

Inspect unified patch files and preview exact-context application to supplied source without running commands.

Dockerfile and Compose Linter

Check Dockerfile or Compose text with a bounded static rule set and line references for review.

GraphQL Query Formatter and Validator

Parse and format GraphQL syntax locally without contacting a schema or server.

JSON Schema Validator and Sample Generator

Check JSON against a supported schema subset or generate a sample that passes those same checks.

Kubernetes and CI YAML Checker

Review selected Kubernetes resources or GitHub workflow structures with explicit coverage limits.

Base64 Encoder and Decoder

Encode text or a file as Base64, or decode an image data URI with a preview.

URL Encoder, Decoder and Query Editor

Encode, decode and edit the parts of a web address, including query values with repeated keys.

HTML Entity Encoder and Decoder

Write ampersands and angle brackets as character references, or turn known references back into characters.

Multi-Codec Text Encoder and Decoder

Encode UTF-8 text or decode supported Base32, Base58, Ascii85 and byte-number representations.

String Escape and Unescape Tool

Quote or recover a string using the explicitly selected JSON, JavaScript, SQL, shell, CSV or regex context.

SVG to Data URI Converter

Encode a bounded, supported SVG as a percent-encoded or Base64 data URI and a copyable CSS background declaration.

Regex Tester

Test a JavaScript regular expression against sample text and inspect its matches.

Cron Expression Explainer

Build or explain a five-field cron schedule and preview the next runs in local time.

XML XPath Query Tester

Run a native XPath 1.0 expression against pasted XML and inspect bounded node or scalar results.

JSONPath Query Tester

Select values and their paths from pasted JSON using a documented JSONPath query subset.

HAR Viewer and Redactor

Inspect a local network HAR and export a reduced copy without bodies, cookies, query values or token headers.

JWT Decoder and Claims Inspector

Read the header and payload of a JWT and see its time-based claims as dates.

Number Base Converter

Convert a signed whole number between bases 2 and 36.

Subnet and CIDR Calculator

Work out the network, host range and mask for an IPv4 or IPv6 prefix.

Chmod Calculator

Turn read, write and execute choices into chmod octal and symbolic modes.

MIME Type and File Signature Checker

Look up extension and MIME names, then compare file headers with their extensions to find mismatches.

Semver Comparator and Range Explainer

Compare semantic versions, sort them with the specification's prerelease rules, and test each one against a range.

HTTP Status Code Reference

Look up HTTP status names and registry references in a dated, bundled IANA snapshot.

SPDX License Metadata Lookup

Find SPDX identifiers, names, canonical references and supplied flags in a pinned license-list snapshot.

Snowflake and Prefixed ID Decoder

Decode a 64-bit snowflake using an explicit epoch and bit layout, or split a prefixed identifier at a separator.

ZIP Archive Extractor and Creator

Inspect or extract supported ZIP entries, or create a ZIP from selected local files.

User-Agent and Client Hints Explainer

Explain recognizable user-agent and supplied client-hint fields with explicit heuristic limits.

Browser Feature Support Lookup

Look up selected browser API and CSS compatibility records from a pinned MDN snapshot.

SQL DDL to ER Diagram

Turn supported CREATE TABLE declarations into a reviewable relationship diagram and Mermaid source.

OpenAPI Specification Inspector

Review supported OpenAPI document structures and list operations, parameters and response codes.

Font File Metadata Inspector

Read names, font metrics and selected character-map details from a local TTF or OTF file.

Dotenv Inspector and Example Builder

Check environment-variable keys and duplicate rows, then build an example file with every value replaced.

UUID, ULID and NanoID Generator and Validator

Create test identifiers in four formats and check whether a value matches one of them.

cURL Command Builder

Write a cURL command for an HTTP request and get the same request as fetch, Python and PHP code.

Conventional Commit Message Builder

Build a Conventional Commits message from a type, scope, description, body and footers, or check a pasted one.

Regex to Code Snippet Generator

Create a regex code example with language-specific string quoting and supported flag choices.

gitignore Generator

Combine selected curated ignore rules with your own lines and review bounded static observations.

HTML Boilerplate Generator

Generate a semantic HTML starting page with language, viewport, metadata, a skip link and an optional canonical URL.

Responsive Table Generator

Export an escaped semantic table with scroll, stacked-label or card-style responsive CSS.

HTML Form Builder

Generate labeled form markup from a bounded field schema with supported validation attributes and help text.

Web Server Rule Generator

Generate bounded nginx or Apache redirect and static-cache snippets from explicit entered choices.

SVG Sprite Builder

Combine supported static SVG icons into a symbol sprite with prefixed internal identifiers.

Color Picker and Converter

Pick a color or enter a HEX, RGB or HSL value, then copy the equivalent formats.

Contrast Checker

Check text and background colors against WCAG 2.2 contrast thresholds.

CSS Gradient Generator

Build a linear, radial or conic gradient with up to eight color stops, preview it and copy the CSS.

Box Shadow Generator

Build up to eight box-shadow layers with offsets, blur, spread, opacity and inset, then copy their CSS.

Aspect Ratio Calculator

Find a missing dimension or calculate widths and heights across the breakpoint sizes you supply.

CSS Unit Converter

Convert px, rem, em, percent, vw, vh and pt using the font, reference and viewport sizes you enter.

CSS Grid Layout Generator

Set columns, rows, gap and a stacking breakpoint, watch the grid update, then copy the CSS and HTML.

CSS Named Color Reference

Search CSS color keywords by name or hex value, or find the nearest named color using a stated RGB distance.

CSS Text Shadow Generator

Build bounded layers of CSS text shadows, add an optional outline and compare the result at three font weights.

CSS Filter and Backdrop Filter Generator

Combine CSS filter settings in a fixed order and copy filter or backdrop-filter declarations with a local sample.

CSS Transform and 3D Playground

Combine bounded translate, rotate, skew, scale and perspective settings, then copy CSS and the equivalent matrix.

CSS Flexbox Playground

Adjust Flexbox direction, wrapping, alignment, gaps and shared item sizing with a live sample and copyable CSS.

Typography Scale and Line Height Calculator

Build a modular type scale with pixel and rem sizes, suggested line heights and copyable CSS variables.

Web Font Stack Generator

Build a system, serif or monospace font stack with optional custom family names and an available-font sample.

Spacing Scale Generator

Generate a bounded linear or geometric spacing scale and copy pixel or rem CSS custom properties.

Color Palette Generator

Generate hue-based color harmonies and bounded tints or shades from an opaque base color.

CSS Theme Token Builder

Create CSS custom properties for light and dark themes from a bounded set of validated token values.

CSS Spinner and Skeleton Generator

Export fixed spinner or skeleton templates with chosen dimensions, colors and reduced-motion behavior.

CSS Animation and Keyframe Generator

Build validated animation steps, timing and playback settings with a controlled native preview.

CSS Specificity Calculator

Inspect selector specificity as an ordered tuple, with contributions and explicit comparison assumptions.

CSS Clip-Path and Shape Generator

Create polygon, circle, ellipse or inset clip shapes using validated percentage coordinates.

SVG Path Data Explainer and Editor

Inspect SVG path commands and nudge a selected endpoint or control point with a native path preview.

Color Blindness Simulator

Compare a palette with named approximate full-deficiency color simulations and pair distances.

Font Pairing Preview

Preview heading and body combinations with the site’s bundled fonts and explicit fallback stacks.

SVG Optimizer and Cleaner

Clean a restricted SVG subset and compare optional numeric precision changes before download.

CSS to Tailwind Reference

Map a finite CSS declaration subset to pinned Tailwind defaults and look up supported utilities.

CSV/JSON Converter

Convert a flat table between delimited text, JSON, XML and an Excel workbook.

Password Generator

Generate random passwords or word passphrases in your browser.

Colour Picker from Image

Read the color of any pixel in an image and copy its HEX, RGB, HSL and alpha values.

Hash and Checksum Generator

Compute SHA, CRC32 or legacy MD5 checksums for text or files and compare a supplied digest.

Unix Timestamp Converter

Convert Unix timestamps or inspect and construct ISO calendar timestamps with explicit offsets.

GCD and LCM Calculator

Find the greatest common divisor and least common multiple of whole numbers.

Digital Storage Converter

Convert bits and bytes with named decimal or binary storage units.

Password Strength Checker

Get a local, dictionary-based estimate of a password's strength.

Image Palette Extractor

Extract representative image colors and download a palette as JSON, CSS variables or a PNG strip.

Length Converter

Convert a length between metric, imperial and nautical units.

Area Converter

Convert a land or surface area between metric and international units.

Volume Converter

Convert a volume between metric, cubic, US liquid and imperial units.

Scale Drawing Calculator

Convert between real and drawing lengths using an entered drawing-to-real ratio and compatible length units.

Ring Size Converter

Compare ring measurements with a dated Tiffany size reference while keeping measurement and fit limits clear.

Mass and Weight Unit Converter

Convert a mass between metric and imperial units, naming each ton.

Speed Converter

Convert speed units or a running pace and see the reciprocal measure.

Temperature Converter

Convert a temperature reading or change between Celsius, Fahrenheit and Kelvin.

Digital Storage Converter

Convert bits and bytes with named decimal or binary storage units.

Data Transfer Rate Converter

Convert bit and byte transfer rates with explicit decimal SI and binary IEC prefixes, keeping their factors distinct.

File Transfer Time Calculator

Estimate file transfer duration from size, rate and an explicit usable-rate percentage, with SI and IEC units separated.

Cooking Measurement Converter

Estimate cooking volume or mass using an ingredient density you supply.

Recipe Scaler

Scale measured ingredients from the recipe's current servings to the servings you want.

Energy Converter

Convert joules, kilowatt-hours, calories and BTU, with each calorie and BTU definition named.

Fuel Economy Converter

Convert km/L, mpg and liters per 100 km, with US and imperial gallons named and the reciprocal shown.

Power Converter

Convert watts, kilowatts and the three named horsepower units, with each definition stated.

Angle Converter

Convert degrees, radians, turns, gradians and arc units, and read the result in degrees, minutes and seconds.

Pressure Converter

Convert pascals, bar, atmospheres, torr and psi on an absolute or gauge basis you choose.

Frequency and Period Converter

Convert a positive frequency or cycle period using reciprocal relationships and explicit time-unit scales.

Trip Fuel Cost Calculator

Estimate trip fuel and cost from entered distance, consumption and price, with US and imperial gallons kept distinct.

Force Converter

Convert force between newtons, pound-force and other named units using a stated standard-gravity convention.

Torque Converter

Convert torque between newton-metres, pound-force feet and other supported moment-of-force units.

Density Converter

Convert mass density between kilograms per cubic metre, grams per cubic centimetre and supported customary units.

Viscosity Converter

Convert dynamic or kinematic viscosity, supplying density explicitly when moving between the two quantities.

Acceleration Converter

Convert acceleration units, including standard gravity, metres per second squared and feet per second squared.

Flow Rate Converter

Convert volume or mass flow rates, requiring an entered density when changing between volume and mass.

Electric Charge Converter

Convert electrical charge between coulombs, ampere-hours and supported decimal scales.

Electric Current Converter

Convert electrical current between amperes and supported SI prefix scales while retaining its sign.

Voltage Converter

Convert voltage between volts and supported SI prefix scales without altering the measurement convention.

Resistance and Conductance Converter

Convert resistance or conductance scales and take their reciprocal when the entered value is positive.

Capacitance Converter

Convert capacitance scales and decode supported three-digit numeric capacitor markings in picofarads.

Inductance Converter

Convert inductance between henries, millihenries, microhenries and supported smaller scales.

Magnetic Flux Density Converter

Convert magnetic flux density between tesla, gauss and supported tesla prefix scales.

Illuminance Converter

Convert illuminance between lux and foot-candles without converting it into surface luminance.

Luminance Converter

Convert luminance between candelas per square metre, nits and supported traditional luminance units.

Radiation Unit Converter

Convert radiation units within the same physical quantity using documented fixed conversion factors.

Concentration Converter

Convert compatible concentration units with explicit molar-mass or solution-density inputs when needed.

Office Text Format Converter

Convert supported plain paragraphs between DOCX, ODT, RTF and TXT without carrying advanced formatting.

Shoe Size Reference Converter

Compare measured foot length or listed sizes against a dated adidas adult shoe chart with explicit missing ranges.

Percentage Calculator

Work out a percentage of a number, a change, or a difference between values.

Fraction Calculator

Add, subtract, multiply, divide or simplify exact fractions.

Ratio and Proportion Calculator

Simplify a ratio of 2 to 12 terms, or solve one missing value in a proportion.

GCD and LCM Calculator

Find the greatest common divisor and least common multiple of whole numbers.

Scientific Calculator

Work out brackets, powers, roots, trigonometry and logarithms, then copy the rounded answer.

Prime Factorization Calculator

Factor a bounded positive integer into exact primes and exponents, with the multiplication shown for checking.

Permutations and Combinations Calculator

Count ordered arrangements or unordered selections with explicit repetition rules and exact integer results.

Set Calculator

Compare literal line-based sets with union, intersection, differences or a bounded Cartesian product.

Rounding and Significant Figures Calculator

Round a bounded decimal to chosen decimal places or significant figures using an explicit rounding rule.

Arithmetic and Geometric Sequence Calculator

Calculate an arithmetic or geometric nth term and finite sum, with a bounded list of terms and explicit indexing.

Linear Interpolation Calculator

Estimate a value between supplied points using piecewise linear interpolation, with extrapolation only when selected.

Coordinate Geometry Calculator

Calculate distance, midpoint, slope and a line equation from two points, including vertical and coincident cases.

Modular Arithmetic Calculator

Calculate Euclidean remainders, modular powers or multiplicative inverses using bounded exact integer arithmetic.

Ohm’s Law Calculator

Calculate voltage, current, resistance and power from two supplied values in a simple resistive DC model.

Resistor Color Code Calculator

Decode or generate supported four- and five-band resistor codes with nominal resistance and tolerance.

Complex Number Calculator

Add, subtract, multiply or divide rectangular complex numbers and inspect the result’s magnitude and phase.

Matrix Calculator

Calculate bounded matrix arithmetic, transpose, determinant, inverse or rank with explicit numeric limitations.

Vector Calculator

Calculate two- or three-dimensional vector dot products, magnitudes, angles and projections, plus 3D cross products.

Solid Geometry Calculator

Calculate volume and total surface area for a cube, cuboid, sphere, cylinder, right circular cone or square pyramid.

Linear Equation System Solver

Solve a bounded linear system and report a unique solution, inconsistency or an underdetermined numerical result.

Polynomial Root Finder

Find bounded-degree approximate real root candidates and inspect their normalized residuals.

Descriptive Statistics Calculator

Summarize a list of numbers with count, sum, mean, median, mode and range.

Standard Deviation Calculator

Calculate population or sample variance and standard deviation for a list.

Weighted Average Calculator

Average value and weight pairs and show each row's share of the total.

Percentile and Quartile Calculator

Calculate a chosen percentile and quartiles using a named interpolation or nearest-rank method on entered numbers.

Moving Average Calculator

Smooth an entered numeric series with a simple or exponential moving average and an explicit starting convention.

Outlier Detector

Flag possible numeric outliers with an explicit IQR or z-score method while retaining every observation and its order.

Conditional Probability Calculator

Calculate a conditional probability from a joint event, or update an entered prior using Bayes’ rule.

Effect Size Calculator

Calculate pooled-SD Cohen’s d and an approximate Hedges correction, or square a supplied Pearson correlation.

Correlation and Regression Calculator

Fit a straight line to paired numbers and inspect Pearson correlation, predictions and residuals.

Probability Distribution Explorer

Evaluate binomial, Poisson and normal probabilities and inspect a bounded distribution plot.

Confidence Interval Calculator

Calculate named mean or proportion confidence intervals from entered sample summaries.

Sample Size Calculator

Estimate sample counts for mean or proportion precision under entered assumptions.

Statistical Hypothesis Test Calculator

Run supported summary-based t, z and chi-square tests with explicit assumptions and tails.

GPA Calculator

Calculate a course-credit GPA on a US 4.0 scale and compare optional weighted grades.

Quadratic Equation Solver

Solve ax² + bx + c = 0 and read the discriminant, the roots and the steps.

Shape Area Calculator

Calculate shape areas, solve triangles, measure circle sectors and find polygon areas from vertices or equal sides.

Derivative Calculator

Differentiate a bounded real expression grammar and evaluate the derivative at an entered point.

Integral Calculator

Compute polynomial antiderivatives or bounded numerical definite integrals with explicit assumptions.

Function Graph Plotter

Plot a supported real expression on an entered range and export SVG plus sampled CSV values.

Loan Payment Calculator

Estimate the fixed payment, total paid and total interest on a loan.

Compound Interest Calculator

Estimate how a balance grows with compound interest and contributions.

Mortgage Calculator

Estimate a fixed-rate mortgage with entered tax, insurance, HOA dues, upfront fees and extra principal.

Simple Interest Calculator

Calculate simple interest on one principal using a fixed annual rate and term.

Savings Goal Calculator

Find the monthly contribution needed to reach a savings target using an entered interest rate and deadline.

CAGR Calculator

Find the constant annual growth rate connecting starting and ending values using the entered duration.

Net Present Value Calculator

Discount equal-period cash flows and inspect each present value, starting with the first flow at time zero.

Debt Payoff Planner

Compare balance-first and rate-first repayment orders using the same entered debts and monthly budget.

Credit Card Payoff Calculator

Estimate payoff using a fixed monthly payment or a stated percentage-and-floor minimum-payment rule.

Loan Refinance Comparison

Compare an existing loan with replacement terms and fees, including costs and balances at the same horizon.

Loan Fee and Effective Rate Calculator

Find a modeled monthly borrowing yield from net proceeds and equal monthly repayments, then annualize it.

Retirement Savings Projection

Illustrate saving and withdrawal phases using entered return and inflation assumptions, including depletion.

Internal Rate of Return Calculator

Find approximate return-rate candidates for entered periodic cash flows within a bounded range.

Rent or Buy Scenario Calculator

Compare modeled buyer equity and a renter investment account using entered constant assumptions.

Discount Calculator

Calculate a sale price, the discount amount and any tax.

Tip Calculator

Calculate a tip and split a tax-inclusive bill equally or by entered share weights.

Sales Tax Calculator

Add sales tax to a price or find the tax included in a total using a rate you enter.

Margin and Markup Calculator

Find margin and markup from an item's cost and selling price, with both formulas shown.

Purchasing Power Calculator

Model future cost and the purchasing power of unchanged money with an entered inflation rate.

Unit Price Comparison

Compare two pack prices on a compatible mass, liquid-volume or item-count basis.

Subscription Cost Calculator

Convert entered weekly, monthly, quarterly and yearly charges into comparable annual totals and monthly equivalents.

Currency Converter

Convert an amount using a rate you enter, with a clear direction and an optional source date.

Break-even Calculator

Work out the units and revenue needed to cover fixed costs at a given price and variable cost.

Salary to Hourly Calculator

Turn an annual gross salary into an hourly rate, or an hourly rate into annual pay, from paid hours and weeks.

Return on Investment Calculator

Calculate net gain and simple ROI from investment cost, additional expenses and total proceeds.

Payback Period Calculator

Find when periodic net receipts recover an initial outlay, or see the amount still unrecovered.

Cost of Goods Sold Calculator

Calculate periodic cost of goods sold from opening inventory, net purchases and closing inventory.

Inventory Turnover Calculator

Calculate inventory turns and inventory days from COGS, opening and closing stock, and period days.

Business Liquidity Calculator

Calculate working capital, current ratio and quick ratio, excluding entered inventory and prepayments.

Freelance Rate Calculator

Estimate a freelance hourly rate from annual gross income, business costs and expected billable time.

Overtime Pay Calculator

Split entered hours into regular and overtime pay using your chosen threshold, base rate and overtime multiplier.

Commission Calculator

Calculate flat commission or marginal tiers, applying each tier rate only to the amount in that band.

Depreciation Calculator

Build a straight-line or entered-rate declining-balance schedule from asset cost, salvage value and useful life.

Economic Order Quantity Calculator

Calculate classical EOQ from period demand, ordering cost and holding cost, with a cost breakdown.

Budget Planner

Total entered monthly income and expense rows by category and export a local budget.

Shared Expense Settlement

Split entered expenses among named people and calculate transfers that settle their exact cent balances.

Cash Drawer Reconciliation

Compare counted cash denominations with the expected drawer balance from opening cash and entered cash movements.

Percentage Calculator

Work out a percentage of a number, a change, or a difference between values.

Date Difference Calculator

Find the interval between two calendar dates in days, weeks and months.

Age Calculator

Calculate an exact age on a chosen date, with the next birthday.

Add or Subtract Dates

Move a date forward or back by whole years, months, weeks and days.

Business Day Calculator

Count workdays in a date range or move a date by a set number of workdays.

Duration Calculator

Add or subtract elapsed time and convert it into hours, minutes and seconds.

Hours Worked Calculator

Add up clock-in and clock-out times, subtract unpaid breaks, and read the total in hours, minutes and decimal hours.

Day of Year Calculator

Convert a Gregorian calendar date to its day-of-year number, or convert a year and ordinal day back to a calendar date.

Recurring Date Generator

List daily, weekly or monthly calendar dates, with an explicit rule for dates absent from short months.

Deadline Backplanner

Work backward from an exclusive finish date through calendar-day task durations and predecessor links.

Shift Roster Builder

Build an entered shift roster, resolve its clock times and report overlaps for the same worker.

CSV to Calendar File

Create an ICS calendar file from CSV rows with explicit UTC times or all-day dates.

Merge and Deduplicate Calendars

Combine supported ICS event files and resolve duplicate event identifiers using an explicit policy.

Time Zone Converter

Convert one local time into another named time zone, with both offsets shown.

Journey Arrival Time Calculator

Find local arrival date and time from a zoned departure and elapsed journey, including offset changes.

Meeting Time Planner

Find shared meeting starts within entered working windows across named time zones.

Daylight Saving Transition Explorer

Inspect yearly clock-offset changes for a named zone, including skipped and repeated local ranges.

Unix Timestamp Converter

Convert Unix timestamps or inspect and construct ISO calendar timestamps with explicit offsets.

ISO Week Number Calculator

Find the ISO week-year, week number and weekday for a date.

Printable Calendar Generator

Build monthly or yearly printable calendars with a selected first weekday and entered dated labels.

Calendar Event File Generator

Create one finite iCalendar event from entered dates, text and an explicit timezone.

Calendar File Viewer

Inspect supported local ICS event details and report unresolved or unsupported calendar features.

Calendar Conflict Checker

Compare finite local calendar events for overlaps under an explicit timezone policy.

Online Timer

Count down from a time you set, with pause, reset, a finish sound and a full screen display.

Stopwatch

Time an activity with start, pause and lap controls, and read every lap beside the running total.

Countdown to a Date

Count down to a date and time you choose, with a live display and an optional finish sound.

Pomodoro Timer

Run focus and break sessions in turn, with start, pause and reset. The timer catches up when you return to the tab.

Interval Timer

Run a named sequence of intervals with repetitions, pause/resume controls and current/next status.

BMI Calculator

Calculate adult BMI from height and weight in metric or imperial units, including feet and inches.

Daily Calorie Needs Calculator

Estimate adult resting energy use and rough daily energy use from measurements and an activity assumption.

Nutrition Label Comparer

Scale supplied nutrition labels to entered amounts, keeping missing nutrients and different mass or volume bases clear.

Recipe Nutrient Totals

Combine ingredient amounts and supplied label values into recipe totals, with optional arithmetic per entered serving.

Caffeine Intake Worksheet

Total caffeine from entered product-label amounts and consumption events, while keeping unknown label values visible.

Running Pace Calculator

Turn a distance and elapsed time into average pace per kilometer and mile, plus average speed.

Heart Rate Zone Calculator

See approximate moderate and vigorous activity heart-rate ranges from an adult age.

Strength Workout Log

Record exercise sets, repetitions and external weights, then compare session totals using an explicit weight convention.

Weekly Adult Activity Summary

Group entered adult activity minutes and strengthening dates into Monday-start weeks, with portable summaries.

Running Split Planner

Plan unequal route segments with individual paces and compare completed elapsed splits without hiding missing records.

Cycling Gear and Cadence Planner

Compare bicycle gears and cadence from entered sprockets and wheel circumference, with a theoretical speed matrix.

Personal Mobility Routine Planner

Arrange your own movements, sides, repetitions and rests into a reusable routine and printable instruction cards.

Indoor Rowing Pace and Power Calculator

Compare rowing time, distance, split and watts using the stated Concept2 indoor-rower relationship.

Barbell Plate Loading Planner

Find symmetric exact or nearest barbell loading from entered bar, collar and plate inventory weights.

Workday Movement-Break Itinerary

Place user-chosen breaks inside work windows, report busy-period clashes and export a printable day itinerary.

Swim Interval Set Builder

Build a poolside set card from entered repetitions, distances, paces, rests and send-offs, with checked totals.

Body Measurement Journal

Keep dated body measurements and compare changes for each measurement, with reusable records and a printable summary.

Sleep Diary

Record sleep intervals, naps and awake minutes with explicit UTC offsets, then export an entered sleep diary.

Hydration Intake Diary

Total entered drinks by day, convert volume units and optionally compare with a daily amount you choose.

Period Record Diary

Keep entered period start and end dates and review historical intervals without predicting future dates.

Symptom and Trigger Timeline

Put entered symptoms and separate context events on a timestamped timeline for later discussion.

Appointment Question Packet

Collect appointment goals, concerns, questions and observations into an editable preparation packet you can print.

Food and Reaction Diary

Keep meal events and separately entered reactions on one chronology without inferring an allergy or cause.

User-Defined Sleep Schedule Planner

Place a sleep opportunity you choose against dated commitments, with explicit UTC offsets and overlap reports.

UTM Builder

Add UTM campaign tags to any web link and copy the result.

Slug Generator

Generate one URL slug or a list from titles, with separator controls and duplicate checks.

WhatsApp Link Generator

Build a click-to-chat WhatsApp link with an optional pre-filled message.

Tracking Parameter Stripper

Remove selected utm, click id and other tracking parameters while leaving other query values and fragments in place.

Mailto Link Builder

Turn addresses, a subject and a message into one encoded mailto link you can copy into a page.

UTM Taxonomy Auditor

Audit campaign URLs against entered UTM naming rules and export normalization while preserving other query pairs.

Favicon Generator

Make favicon files and a web app icon from one image, ready to add to your site.

SERP Snippet Preview

Preview how a page title, URL and description may appear in a search result.

Open Graph Preview

Preview a social link card using your title, description, site name and image.

Meta Tags Analyzer

Paste page HTML to check the title, description, canonical link, robots meta and social tags, with repeats called out.

Meta Robots Tag Generator

Draft a robots meta tag or X-Robots-Tag from selected indexing and snippet rules.

Email Signature Generator

Build a simple HTML or plain-text email signature from your contact details.

Social Post Length Checker

Count a social draft against an X, LinkedIn or custom length guide and suggest a shorter cut.

Keyword Density Checker

Count words, phrases and letters in pasted text, and highlight repeated words where they appear.

Internal and External Link Analyzer

Paste HTML and a base address to sort every link into internal, external, email, phone and on-page anchors.

Schema Markup Generator and Validator

Build JSON-LD for ten named types, or paste a block and check its context, type, identifiers, addresses and dates.

Heading Structure Analyzer

Paste page HTML to see the heading outline, the count for each level and the places where the order skips a level.

Search Console Export Analyzer

Summarize one Search Console CSV or compare two periods by item, with metric changes and a CSV report.

HTML Accessibility Hints Checker

Paste page HTML to check nine accessibility hints, from missing alt text to repeated id values, with a sample of each.

Email HTML Preview and Safety Checks

Preview a sanitized email HTML approximation in an isolated frame and review selected removed elements and attributes.

Local Site Reference Auditor

Check supplied HTML pages for absent link targets, missing fragments, repeated IDs and pages unreachable from an entry.

Canonical and Indexability Matrix

Compare supplied canonical, robots and response declarations, keeping missing evidence separate from observed conflicts.

Hreflang Cluster Auditor

Check language alternates for missing return references, repeated language labels and unavailable target evidence.

Redirect Migration Map Auditor

Review exact URL mappings for redirect chains, loops, many-to-one destinations and absent final-target evidence.

HTTP Cache Freshness Simulator

Calculate current cache age and explicit freshness from supplied response headers and ordered UTC scenario times.

Multi-Run HAR Asset Budget Analyzer

Compare HAR runs by redacted request identity, known transfer bytes, recorded overlap and an entered asset budget.

Responsive Image Markup Planner

Prepare width-based image markup from entered candidate widths, viewport slots and a declared device pixel ratio.

Source Map Inspector

Look up positions in a flat version-3 source map and report source inventory without exporting embedded source text.

HTML Form Serialization Tester

Inspect successful controls in supplied form HTML and export local URL-encoded and multipart text test bodies.

Stylesheet Compatibility Auditor

Scan literal CSS features against a small pinned browser-support subset, with recorded conditions and unassessed syntax.

Newsletter HTML Template Builder

Compose entered newsletter sections into responsive email HTML, a plain-text alternative and a link inventory.

HTTP Content Negotiation Tester

Rank offered representations against entered Accept, language and encoding fields under a declared offline model.

JSON-LD Reference Graph Auditor

Inspect identities and reference edges across supplied JSON-LD documents using a bounded local context subset.

HTTP Multipart Body Inspector

Inspect supplied multipart body bytes as bounded parts, with boundary findings and local extracted test copies.

Font-Stack Text Coverage Checker

Compare text code points with entered coverage ranges or supported font cmaps, showing fallback and missing characters.

HTML Microdata to JSON-LD Extractor

Extract supported microdata from inert supplied HTML into a JSON-LD draft with a property map and omission findings.

Static Unused CSS Selector Report

Compare supported CSS selectors with a supplied HTML snapshot, separating unmatched candidates from unknown states.

Robots.txt Generator and Path Tester

Build a robots.txt from pasted rules and test one path against the supported Google-style subset.

Sitemap XML Generator and Validator

Build a sitemap XML file from a list of addresses, or check a pasted sitemap for problems.

Hreflang Tag Generator

Make reciprocal hreflang tags or a sitemap from language codes and full page URLs.

Web App Manifest Validator

Check a manifest.json pasted or chosen from your device: name, start_url, scope, display, colours and icon entries.

RSS and Atom Feed Validator

Review pasted RSS or Atom XML structures and read entry previews without fetching links or content.

RSS Feed Builder

Build an RSS 2.0 XML file from entered channel details and a CSV list of dated article links.

PWA Cache Scenario Planner

Model entered asset revisions and cache strategies across declared online, offline and update scenarios.

Offline Static-Site Bundle Packager

Package supplied static HTML, CSS and assets into a reviewed ZIP with local references and an omissions report.

Digital Marketing Metrics Calculator

Calculate campaign metrics and optional stage-by-stage funnel conversion and drop-off.

Campaign Budget Pacing Calculator

Compare campaign spend with a straight-line budget pace and calculate the remaining daily allowance.

Ad Copy Length Checker

Estimate entered Google responsive search ad field lengths using dated limits and explicit Unicode cautions.

QR Code Generator

Create a static QR code you can download as a PNG or SVG image.

URL Encoder, Decoder and Query Editor

Encode, decode and edit the parts of a web address, including query values with repeated keys.

Password Generator

Generate random passwords or word passphrases in your browser.

Password Strength Checker

Get a local, dictionary-based estimate of a password's strength.

Hash and Checksum Generator

Compute SHA, CRC32 or legacy MD5 checksums for text or files and compare a supplied digest.

HMAC Calculator

Sign a message with HMAC using SHA-256, SHA-384 or SHA-512, and verify a signature another system published.

Subresource Integrity Generator

Hash exact local script or stylesheet bytes and generate an escaped HTML tag with an SRI attribute.

Checksum Manifest Verifier

Compare local files with SHA-256 or SHA-512 entries from a checksum manifest and report missing or mismatched files.

Directory Snapshot Integrity Comparer

Hash two local file collections and compare paths and exact content changes using SHA-256 snapshots.

Local Merkle Proof Workbench

Build an ordered SHA-256 Merkle tree from local files and verify an inclusion proof against an explicitly supplied root.

CSP Generator and Pasted-Policy Checker

Draft a Content Security Policy from a strict baseline, or check a pasted policy for structural problems.

Security Headers Builder and Checker

Inspect pasted HTTP headers by group, check security fields or draft a non-CSP header block.

Email Header Analyzer

Paste a message's full headers to unfold them, list the Received hops and read its SPF, DKIM and DMARC claims.

CORS Header Builder and Explainer

Draft CORS response headers and compare a supplied request with an explicit teaching policy.

Cookie Header Explainer

Inspect separate cookie header lines with masked values and explain their stated scope, expiry and attributes.

OAuth and OIDC Client Configuration Audit

Review declared OAuth or OIDC client redirects, flow settings and PKCE choices as an offline configuration worksheet.

Referrer-Policy Disclosure Simulator

Show the modeled referrer for entered source and destination URLs under a selected policy without browsing.

Permissions-Policy Delegation Simulator

Model selected feature delegation for one iframe using top-page policy, its allow attribute and child restrictions.

CSP Violation-Report Analyzer

Group supplied CSP violation reports by directive and disposition while omitting URL details and samples.

Email Authentication Configuration Audit

Review supplied SPF, DKIM and DMARC structure and declared domain alignment without DNS or message checks.

SSH Client Configuration Audit

Review supported SSH client settings for a named target and explain selected first-obtained values offline.

Access Permission Matrix Auditor

Evaluate an entered role-resource-action permission model and report effective grants, denials and contradictory rules.

SBOM Inventory Comparator

Compare supported CycloneDX or SPDX JSON inventories for component identities, versions and declared licences.

Sensitive Text Redactor

Mask known sensitive patterns in text or selected CSV columns and download a redacted table.

Dataset Pseudonymizer

Replace selected CSV identifiers with local pseudonyms and optionally export their mapping.

Suspicious URL and Homograph Inspector

Inspect URL syntax, normalized hosts and limited lookalike-character facts without visiting a link.

OAuth Flow Helper and PKCE Explainer

Generate local PKCE test values and inspect an authorization URL’s supported parameters.

TOTP Code Generator

Generate a time-based code from an entered Base32 secret, with explicit algorithm, time step and validity bounds.

Local File Encryptor

Encrypt one local file into a password-protected .uftenc container and restore it with the same password.

Offline Credential Reuse Audit

Find exact repeated passwords in a local account CSV and export account-only reuse groups without password values.

Redaction Verification Report

Check proposed redacted text for listed sensitive terms and export residual counts without the terms.

Local Multi-File Secret-Pattern Scanner

Scan selected local UTF-8 files for documented credential patterns or literal terms with value-free findings.

PGP Public Key Inspector

Inspect bounded version 4 public OpenPGP packets, fingerprints and unverified user IDs locally.

PEM Certificate and CSR Decoder

Decode public certificate, CSR and public-key metadata from a bounded strict DER/PEM structure.

Public JWK and JWKS Inspector

Inspect supported public JWK or JWKS keys, calculate SHA-256 thumbprints and export supported public key formats.

Certificate Inventory and Expiry Report

Inventory supplied public certificates, group duplicate fingerprints and compare validity dates at an entered time.

OpenSSH Public-Key and Authorized-Keys Inspector

Inspect supported public OpenSSH key records, fingerprints and declared authorized_keys restrictions offline.

Known-Hosts Change Comparer

Compare supplied known_hosts snapshots and report added, removed or changed public key pins without contacting hosts.

WebAuthn Public Response Inspector

Decode supplied WebAuthn public response fields and supported authenticator or attestation metadata.

JWS Signature Verifier

Verify a compact RS256 or ES256 JWS against a separately supplied public key and inspect explicit claim-policy checks.

Detached Public-Key Signature Verifier

Verify exact local file or UTF-8 message bytes and a detached signature against a supplied public key.

JWT Decoder and Claims Inspector

Read the header and payload of a JWT and see its time-based claims as dates.

QR Code Generator

Create a static QR code you can download as a PNG or SVG image.

PNG

Wi-Fi QR Code

Make a scannable code for a Wi-Fi network name and password.

PNG

vCard QR Code

Put contact details in a QR code that a phone can scan.

Barcode Generator

Make a Code 128, EAN-13 or UPC-A barcode and download it as SVG or PNG.

Procedural Tessellation SVG Maker

Create a bounded repeating geometric SVG with chosen tile shape, motif, size and palette.

Packaging Dieline Generator

Draw a dimensioned cut-and-fold pattern for the supported paper-box scope, with distinct cut, fold and tab markings.

Scaled Room and Furniture Planner

Draw an entered rectangular room and measured furniture, reporting overlaps and objects outside the room.

Knitting Chart and Stitch-Count Builder

Turn entered stitch-symbol rows into a repeat-aware chart with a legend, row directions and stitch counts.

Parametric Solid STL Builder

Export a bounded cuboid or polygonal cylinder as binary STL, with dimensions and mesh-integrity checks.

Checklist Maker

Turn a short item list into a printable PDF checklist with one empty box beside each item.

Habit Tracker Chart Maker

Build a printable monthly habit chart with one row per habit and a blank box for each day.

Meeting Agenda and Notes Builder

Turn timed agenda topics into a printable meeting sheet with notes, decisions and action lines.

Flashcard Maker and Quiz Player

Make printable question-and-answer cards and test yourself with a one-card-at-a-time quiz.

Tournament Bracket Generator

Build a printable single or double elimination bracket for two to sixteen entrants, with byes and a reset final.

Job Application Tracker

Turn entered application details, statuses and follow-up dates into a local table and printable tracker.

Meal Planner Maker

Lay out seven entered days of meals and grocery notes as a reviewed table and printable weekly plan.

Printable Name Tag and Badge Maker

Arrange entered names and subtitles into measured printable badge boxes on A4 or Letter sheets.

Decision Matrix and Priority Board

Compare entered options with named criteria, disclosed weights and higher-is-better ratings.

Printable Address Label Templates

Arrange entered addresses on a generic A4 or Letter label grid and export a measured PDF sheet.

Certificate and Award Maker

Create a landscape certificate from the recipient, award, issuer and signatory details you enter.

Printable Card and Invitation Maker

Lay out entered recipients and invitation wording as two or four cards on a printable sheet.

Kanban Task Board

Arrange entered tasks in Todo, Doing and Done, with keyboard move controls and explicit exports.

Mind Map Builder

Build a bounded tree diagram from entered parent relationships, with an accessible outline and SVG export.

Round-Robin Fixture Scheduler

Build all-pairs fixtures from entered entrants, with numbered rounds, venue slots and an optional shuffled order.

Swiss Tournament Pairing Helper

Propose a next round from entered scores and opponent history, avoiding rematches under a stated informal rule set.

Constrained Seating Chart

Arrange entered guests at tables while checking together, apart and fixed-table rules within a bounded search.

Secret Santa Assignment Maker

Create one-to-one gift assignments with no self-draw and entered exclusions, then download organizer-visible results.

Bingo Card and Calling-Set Maker

Generate distinct bingo layouts from your entered terms, with numbered printable cards and a matching caller list.

Unique-Solution Sudoku Generator

Generate a standard Sudoku puzzle, check that it has one solution, and export the puzzle and answer sheet.

Maze and Solution-Sheet Generator

Build a connected rectangular maze with a declared entrance and exit, plus a separate solution drawing.

Cryptogram Puzzle Worksheet

Make an A–Z substitution puzzle from supplied text, with frequent-letter hints and optional PDF answer pages.

Arithmetic Practice Worksheet

Make arithmetic practice questions and checked answers from your selected ranges, operations and repetition settings.

Cloze Reading Worksheet

Blank selected words in supplied text, preserving other wording and adding numbered answers and an optional word bank.

Chord Chart Transposer and Songbook

Transpose supported bracketed chord symbols while keeping your supplied sections and lyric text in a printable chart.

Serial Raffle Ticket Sheet

Lay out sequential numbered tickets and matching tear-off stubs, with a printable pack and serial ledger.

Restaurant Menu Builder

Arrange supplied sections, dishes, prices and declared tags into a printable menu and static HTML download.

Board-Game Scorecard Builder

Build a round-by-round scorecard from entered players and scores, using a visible total and winner rule.

Decision Flowchart Builder

Draw a labeled directed flow from entered nodes and edges, with a readable outline and supported loops.

Random Number Generator

Draw whole numbers inside a range, allow repeats or not, and sort the result before you copy it.

Wheel Spinner and Random Name Picker

Spin a wheel built from your own list, keep the list in this browser, and share it through a link when you choose.

Coin Flip

Flip one or more virtual coins and read each heads-or-tails result.

Dice Roller

Roll one or more virtual dice and see each face and the total.

Random Team Generator

Assign entered names to random teams by team count or maximum team size, with team sizes differing by at most one.

Lorem Ipsum Generator

Generate placeholder Latin text by paragraph, sentence or word.