What kind of skew can it fix?

It targets small scanner alignment errors up to five degrees in either direction, not pages rotated by 90 degrees.

Why can auto-detection be wrong?

Pages with few horizontal text lines, illustrations or unusual layouts provide less alignment evidence. Use the manual slider in that case.

Will text remain selectable?

No. Corrected pages are rendered as images to apply the arbitrary rotation accurately.

PDF Tools

Deskew PDF

Detect and correct small rotation angles in scanned PDF pages.

Free foreverRuns in your browserNo sign-up

Drop a PDF here, or click to choose

Processed locally in your browser.

About the Deskew PDF

Deskew PDF corrects small scan angles between minus five and plus five degrees. Auto-detection analyses horizontal text-line alignment on the first page, while the slider provides precise manual control.

The chosen correction is applied consistently to every page and the output is rebuilt as clean page images with white backgrounds.

Key features

Automatic angle estimation
Fine 0.1-degree slider
Live first-page preview
Apply correction to every page

How to use

1Upload a scanned PDF.
2Run auto-detection, then fine-tune the angle while watching the preview.
3Deskew all pages and download the corrected PDF.

Examples

Straighten a tilted scan

Input: Scan leaning 1.5 degrees clockwise

Output: All pages corrected near -1.5 degrees

Use auto-detect as a starting point and verify vertical page edges in the preview.

Frequently asked questions

What kind of skew can it fix?: It targets small scanner alignment errors up to five degrees in either direction, not pages rotated by 90 degrees.
Why can auto-detection be wrong?: Pages with few horizontal text lines, illustrations or unusual layouts provide less alignment evidence. Use the manual slider in that case.
Will text remain selectable?: No. Corrected pages are rendered as images to apply the arbitrary rotation accurately.