Deskew PDF (Straighten Scanned Pages)

How to do it

1. 1
   Choose your settings

   Fill in the details or pick the options you need.

2. 2
   See the result

   The preview updates right away as you change things.

3. 3
   Download or save it

   Save the result to your device. Nothing is sent to or stored on a server.

About this tool

Add a scanned PDF whose pages are slightly tilted and the tool finds the angle of the text lines on each page and rotates the page to make it straight. The result is a new PDF made of the straightened pages. Everything runs on your device.

Why scans are crooked

A page that is fed at a small angle or placed unevenly on a flatbed comes out tilted. Straight text is easier to read, looks professional and gives better results when you run OCR afterwards.

How it works

Each page is drawn as a picture, the dark text pixels are analysed for the angle that makes the text lines most horizontal, and the page is rotated by that angle on a white background. Angles up to ten degrees are corrected.

Good to know

The output pages are pictures, so selectable text is not kept. Run OCR PDF on the result if you need searchable text. Pages with very little text, photos or handwriting may be left almost unchanged because there is no clear line direction.

Privacy

The PDF never leaves your browser.

Tips for best results

Take a moment to read the options before you start, and try the tool with a small sample first. Everything runs in your browser on your own device, so nothing you type or add is uploaded, and closing the tab clears it. If something does not look right, reload the page and try again, or use the report link on this page to tell us what went wrong so we can fix it. If a result still looks wrong, change one value at a time to see which box matters most. Bookmark this page if you will need the tool again.