Free · runs in your browser · nothing is uploaded · works offline
Scan Cleanup Online — Deskew, Trim and Black-and-White, No Upload
Tilted, grey phone scans → straight, clean pages, on your device.
Tilted, grey phone scans → straight, clean pages, on your device.
Private by design: processing happens on your device with open-source libraries served from this site (licences). Nothing is uploaded, and once loaded the tool keeps working offline. Need other tools? All tools are on the homepage.
Free, no ads, no upsell. If it saved you a trip to a paid converter, you can buy the developer a coffee — it funds new tools and keeps this one free. ☕ Buy me a coffee
Runs on your deviceTested on Pixel 7 & MacBook Air M2Open-source engines · licences
About this tool
Phone photos of documents are tilted, grey and surrounded by desk. This tool measures the tilt (±10°) from the text lines and rotates the page straight, crops the background away, then either auto-enhances contrast, converts to grayscale, or thresholds to crisp black-and-white (Otsu). Output as JPG, PNG or a ready PDF.
Cleaning before OCR noticeably improves recognition; run OCR PDF on the resulting PDF to make it searchable.
How it works
- Step 1. Choose or drop the scan(s) or photos.
- Step 2. Pick mode (auto, grayscale, black & white), deskew, trim and output.
- Step 3. Press Clean up and download.
Questions
How accurate is the deskew?
It corrects tilt up to 10° in 0.1° steps; the note reports the angle applied (e.g. "deskewed 1.8°").
It cropped my margins — why?
Trim crops to the content box. Turn Trim off if you want the original margins kept.
Can it fix a photo, not a document?
It is tuned for dark text on light paper; photos (lots of dark area) are left unrotated.
Good to know
- Deskew assumes dark text on a light page.
- Trim cannot remove edge lines spanning the whole width.