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.
Deskew PDF
Add your files. Recommended settings are ready, so you can process in one click.
PDF, Word, images, audio, video, archives and more
Up to 100 files · 250 MB · No account- 1Add files
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What people use it for.
What happens to your file.
Each scanned page is measured by trying angles until its lines of text line up, and a tilted page is re-rendered at 300 DPI and turned level, keeping the page size. Pages that are not scans, or are already straight, are copied into the result untouched, so their text and sharpness survive.
Where it stops: This corrects tilts of up to 15 degrees, not perspective distortion: a photo taken at an angle, where the page is trapezoidal rather than tilted, needs perspective correction instead. A straightened page is an image, so run PDF OCR afterwards if you need searchable text.
Everything you need, without a paywall.
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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