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Mofumi PDF

Manual Deskew

Straighten pages by hand with an alignment grid and fine angle control down to 0.1°.

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About this tool

Automatic deskewing struggles with pages that have little text, tables at odd angles or photos. Manual Deskew lets you set the angle yourself: the page rotates live beneath a fixed alignment grid, so you can line up text, table rules or the edge of a form exactly.

Adjust each page with the slider or the ±0.1° buttons, or type an angle. Apply one angle to every page when a whole batch went through the scanner the same way. Pages are rotated as vectors and keep their size, so text layers stay selectable.

In workflows, set a default angle or list angles per page, for example “1: 1.5” and “3: -0.8”.

Engines: pdf-lib

How to use

  1. 1

    Drop a scanned PDF.

  2. 2

    Go through the pages and rotate each until its lines follow the grid.

  3. 3

    Click Apply angles and download the straightened PDF.

Use cases

  • Tricky scans

    Fix pages with diagrams or photos where automatic detection can't find text lines.

  • Precise alignment

    Line up a form's boxes exactly before adding text fields on top.

  • Consistent batches

    Apply the same small correction to every page of a batch scan.

Frequently asked questions

Which way does a positive angle turn?

Positive angles rotate clockwise, negative angles counter-clockwise.

Will the corners be cut off?

Pages keep their original size, so at large angles the very corners may fall outside. For scans this is usually blank margin.

Can I fix many pages at once?

Yes. Set an angle and click Apply to all pages, then fine-tune individual pages.

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