What happens to pages that are already straight?

They are left alone and copied through unchanged.

Does the page size change?

No. Only the content of a corrected page is scaled down by a few percent, so the rotated corners still fit the sheet.

All tools

Straighten Scan

Put crooked scanned pages back on the level.

Drop your PDF hereor click to browsePDF only, up to 250 MB each.

Files stay in your browser. Nothing is uploaded.

What this tool does

Measures crooked scanned pages and straightens them. Pages are not turned into images: the scan and the text layer on top of it are left as they are, so a document you could search stays searchable.

How to use it

Drop the scanned PDF.
Wait while the skew is measured.
Download the corrected file.

Common questions

What happens to pages that are already straight?: They are left alone and copied through unchanged.
Does the page size change?: No. Only the content of a corrected page is scaled down by a few percent, so the rotated corners still fit the sheet.