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Deskew PDF Online Free — PrivaTools

TL;DR: Upload a tilted scan and download a deskewed copy — angle detected automatically and corrected.

Deskew scanned PDF pages online for free. Automatically detect and correct the tilt angle of scanned documents so text appears perfectly straight and readable. Ideal for fixing wonky scans.

Deskew PDF runs on the same privacy-first stack as every PrivaTools utility: files enter an isolated Docker container, are processed in temporary memory, and are unlinked the moment your download begins. No account, no watermark, no daily quota.

How to Deskew PDF with PrivaTools

  1. Upload a scanned PDF — Drop a scanned PDF up to 500 MB. Works best on documents where text lines are visible.
  2. PrivaTools detects skew per page — The algorithm analyses the text line angle on each page and computes the rotation needed to straighten it.
  3. Download the deskewed PDF — Each page is rotated by its detected angle (typically -5° to +5°) and the corners are cropped to fit. Result: text rows are perfectly horizontal.

Frequently Asked Questions

My scans look fine — should I run deskew?

If the text appears tilted by more than ~0.5°, deskew helps OCR accuracy noticeably. For perfectly straight scans it's a no-op.

Will deskew add white margins?

Yes — rotated pages need a slightly larger canvas. PrivaTools fills the margins with the surrounding background color (usually white).

Should I deskew before or after OCR?

Always before. OCR engines are much more accurate on straight-line text.

Last reviewed 2026-05-01 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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