Can it fix 90-degree rotation?

No. Use Rotate PDF for quarter-turn corrections.

Why can automatic detection be wrong?

Sparse text, photographs, or non-horizontal layouts provide weak alignment evidence.

Can each page use a different angle?

No. The chosen correction applies to every page.

Does text remain selectable?

No. Pages are rendered and rebuilt as images.

What happens at rotated corners?

The rotated page is placed on a white canvas, which can add white triangular areas.

PDF Tools

Deskew PDF

Detect and correct small rotation angles in scanned PDF pages.

Free browser toolRuns in your browserNo sign-up

PDF scan alignment studio

Straighten slightly rotated scanned pages

Estimate a correction from the first page, fine-tune it visually and rebuild every page with one consistent angle.

±5°

correction range

Auto + manual

controls

Local

processing

Drop a PDF here, or click to choose

Processed locally in your browser.

About the Deskew PDF

Deskew PDF corrects small scan alignment errors between minus five and plus five degrees. Automatic analysis estimates an angle from horizontal ink patterns on the first page, and a 0.1-degree slider supports manual correction.

The chosen angle is applied consistently to every page. Each page is rendered, rotated on a white canvas, and rebuilt as JPEG-backed PDF content.

Output is rasterized, so selectable text, links, and forms are lost. Auto-detection is only a starting point and can be unreliable for sparse pages, photographs, vertical writing, or unusual layouts.

Key features

First-page automatic skew estimation
Manual range from -5 to +5 degrees
Fine 0.1-degree adjustment
Live corrected first-page preview
One correction applied to every page
White canvas fill
Rasterized local output

How to use

1Upload a scanned PDF.
2Run automatic detection on the first page.
3Fine-tune the angle with the slider while watching text lines and page edges.
4Apply the correction to every page.
5Inspect the rasterized result, especially pages with different skew.

Examples

Straighten a batch scan

Input: Pages leaning about 1.5 degrees clockwise

Output: Rasterized PDF corrected near -1.5 degrees

Frequently asked questions

Can it fix 90-degree rotation?: No. Use Rotate PDF for quarter-turn corrections.
Why can automatic detection be wrong?: Sparse text, photographs, or non-horizontal layouts provide weak alignment evidence.
Can each page use a different angle?: No. The chosen correction applies to every page.
Does text remain selectable?: No. Pages are rendered and rebuilt as images.
What happens at rotated corners?: The rotated page is placed on a white canvas, which can add white triangular areas.

Open a related tool to prepare your files or refine the finished result.