How to use Document Scanner
- Choose a document photo with all needed page detail visible.
- Enter its four convex corners in order, output size and appearance.
- Inspect the exported image for distorted or missing text before sharing.
Example: Document Scanner
A local worked example using the inputs and settings below for document scanner.
You add
Document photo: ["sample.png (348 bytes)"]
Document corners: x,y percentages: "0,0\n100,0\n100,100\n0,100"
Output width (px): "80"
Output height (px): "60"
Document appearance: "grayscale"
Black and white threshold: "180"
You get
Straightened the chosen document area into a 80 by 60 grayscale PNG.
scanned-document.png (80 × 60 pixels)
Options
- Corner order
- Enter four valid convex corners around the supplied document. Cropped-off text cannot be restored by adjusting them.
- Grayscale and threshold
- Grayscale retains tonal variation; threshold converts supported pixels to light or dark. Small text and faint marks can disappear.
Supported inputs and limits
JPEG, PNG and WebP within 24 megapixels of input and 2 megapixels of output. Enter four valid convex corners. Perspective and tonal treatment do not recover cropped text, remove glare reliably or perform OCR. Review fine text and threshold loss before sharing.
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.
Check the complete document after rectification
The export changes perspective and tone without recognizing text. Inspect page edges, fine print and glare before sharing. Keep the original photograph when the processed copy omits a mark or alters legibility.
Questions about Document Scanner
Does the scan contain selectable text?
No. This is an image correction tool without OCR.
Can it recover a clipped page corner?
No. It uses only the uploaded pixels.
When should I use threshold mode?
Use it when a high-contrast black-and-white result helps, and inspect faint text because thresholding can remove detail.