PDF tool · 100% free

Deskew PDF

Scanned pages are rarely perfectly straight, and even a degree or two of tilt makes a document harder to read and noticeably worse to OCR. This tool detects the skew angle and rotates each page back to level. It is free, needs no account, and adds no watermark to your result.

Built for: deskew pdf

Deleted as soon as you download itFree · fair-use only

Drop PDF files herePDF output · up to 100 files

Included in this tool

Automatic angle detectionScan straighteningPage-by-page correctionOCR-ready output

When you need this

What people use it for.

Straightening pages from a flatbed scanner or a phone photo of a document

Improving OCR accuracy before extracting text from a scan

Tidying an archive of scanned records so pages line up consistently

How it works

What happens to your file.

The dominant text-line angle on each page is estimated and the page is rotated by the correction needed to bring it level, keeping the content within the page bounds.

Where it stops: This corrects small rotations, not perspective distortion. A photo taken at an angle, where the page is trapezoidal rather than tilted, needs perspective correction instead.

What this tool includes

Everything you need, without a paywall.

Automatic angle detection

Scan straightening

Page-by-page correction

OCR-ready output

Questions

Common questions.

Does straightening improve OCR results?

Usually yes, and often substantially. OCR engines assume roughly horizontal text lines, so even a couple of degrees of tilt raises the error rate.

Will it rotate pages that are upside down?

No. This corrects small skew angles. For 90 or 180 degree corrections, use Rotate PDF.

Can it fix a photo of a page taken at an angle?

Only partly. Deskewing corrects rotation, not the keystone effect from shooting at an angle. Photograph the page square-on for the best result.

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