How to use Code Beautifier
- Choose the language of your source code.
- Paste a source file or selection, then set indentation and preferred line width.
- Select Format, review the result, and copy it or download the source file.
Example: Code Beautifier
Make a short JavaScript object readable.
You add
JavaScript, two spaces, width 80: const x={a:1};
You get
const x = { a: 1 }; followed by a newline. Download: formatted.js.
Supported inputs and limits
Up to 1,000,000 characters and 50,000 lines; browser jobs stop after 10 seconds. Prettier 3.9.9 formats JavaScript/JSX, TypeScript/TSX, JSON, CSS/SCSS, HTML, Markdown and YAML. Embedded code blocks stay unchanged. This does not compile, execute, lint or prove that code is correct. PHP, Python, C/C++ and Java are not supported here. Long strings can exceed the preferred line width.
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Review formatting before saving
Formatting rewrites whitespace and may change quotes or punctuation according to the selected language. Keep the original source, compare the result and run your own tests before replacing a file.
Questions about Code Beautifier
Does this run my JavaScript?
No. The formatter parses and prints source text in a browser worker. It does not execute your program.
Why does a line exceed my width setting?
Line width is a wrapping preference. The formatter can keep a string, identifier or other unbreakable expression longer than that width.
Can I format SQL or XML?
Use the separate SQL Formatter or XML Formatter pages. Each page names the formats and checks it supports.