Deskew PDF Online — Free & Secure
Straighten crooked scanned pages automatically. Each page is measured, tilted pages are rotated back into line, and text and images stay sharp — the page is not turned into a picture.
- 1 Upload
- 2 Choose Settings
- 3 Download
Step 1 of 3: Upload your PDF
Drop your PDF file here
or choose a file from your device
PDF only • Up to 50 MB
Drag & drop • Click to browse • No signup required
Your file is processed securely and is automatically removed after processing. Your original is never changed.
- 1 Upload your scanned PDF
- 2 Choose how sensitive to be
- 3 Confirm and straighten
- 4 Download straight pages
Reading your PDF…
- Sent over an encrypted HTTPS connection
- Deleted automatically, normally within 60 minutes
- No registration needed · Privacy Policy
Deskew PDF
Set how much tilt to correct, then download straightened pages.
- 1 Upload
- 2 Choose Settings
- 3 Download
Step 2 of 3: Choose how to straighten
- Tip: try Standard first. Use Sensitive if a page still looks crooked.
- Tip: use Custom Pages to fix only the pages that are tilted.
Measuring and straightening your pages…
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Uploading your file…
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Result Summary
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Useful Tips
- The result screen lists which pages were straightened and by how many degrees.
- If a page is still crooked, run it again with Sensitive from your original.
- Pages that are upside down or sideways need Rotate PDF, not Deskew.
✨ Did you know? You can also compress, crop, merge and more — all in one place!
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Straighten tilted scans automatically.
Getting started
- Upload your scanned PDF.
- Choose the sensitivity and largest correction.
- Confirm and download the straightened PDF.
Key concepts
- How it works
- Each page is rendered at low resolution and its text lines are measured to find the tilt. The page is then rotated by the opposite amount.
- Sensitivity
- Tilts smaller than your setting are ignored, so already-straight pages are not touched.
- Shrink to fit
- A rotated page is shrunk slightly so its corners stay on the paper.
- Your original
- It is never changed.
Tips & shortcuts
- Deskew fixes small tilts. For sideways or upside-down pages use Rotate PDF.
- Pages without much content are skipped.
- Enter confirms · Esc closes a dialog · ? opens this panel.
Did you know? Switching to another tool in the sidebar carries your file over automatically — no need to re-upload.
Still stuck? Read the questions below or contact support and we'll help.
What Is Deskew PDF?
Deskew PDF straightens pages that were scanned or photographed at a slight angle. Each page is rendered at a low resolution, the direction of its text lines is measured, and tilted pages are rotated back into line.
Because the page is rotated rather than re-drawn as a picture, the text of a searchable scan stays searchable and images stay sharp. The result screen lists which pages were straightened and by how much. Pages that are already straight, or have too little content to measure, are left exactly as they were.
When to Use It
- Fix a stack of documents that went through the scanner at a slight angle
- Straighten pages photographed with a phone
- Tidy a PDF before cropping, printing or archiving
- Straighten only the few pages that are crooked
- Prepare scans before running text recognition elsewhere
Step-by-Step Guide
Upload your scanned PDF.
Choose the sensitivity, the largest correction and which pages.
Confirm and straighten.
Download the PDF and check the pages.
Tips
- Standard sensitivity suits most scans
- Pages with little text or lots of graphics may not be measurable
- Use Custom Pages if only some pages are crooked
- Sideways or upside-down pages need Rotate PDF
- To trim the borders afterwards, use Crop PDF
Troubleshooting
Problem: A page was not straightened
Solution: It may be too empty to measure, or its tilt was under your sensitivity setting. Try Sensitive, or raise the largest correction.
Problem: The corner of a page is cut off
Solution: Tick Shrink slightly so corners are not cut off.
Problem: A page got worse
Solution: Photos and drawings with strong diagonal lines can fool the measurement. Run it again from your original with Custom Pages that leave that page out.
Problem: My file will not upload
Solution: Confirm it is a real PDF under 50 MB. Unlock password-protected files first with Unlock PDF.
Deskew PDF FAQ
Does deskewing turn my pages into images?
No. Pages are rotated, not re-drawn, so searchable text stays searchable and images stay sharp.
How does it know how much to rotate?
It measures the direction of the text lines on each page and rotates by the opposite amount.
Can it fix upside-down or sideways pages?
No. Deskew fixes small tilts. Use Rotate PDF for 90 or 180 degree turns.
What is the largest tilt it can fix?
You can set up to 15 degrees. Larger tilts are not corrected.
Why were some pages skipped?
Blank pages and pages with very little content cannot be measured reliably, so they are copied through unchanged.
Are my files kept?
No. Your uploads and the result are deleted automatically a short time after processing.
Privacy & Security
Your files are handled securely
Uploads are transferred over an encrypted connection and processed in an isolated job folder. Your original files are never modified — the result is always a new, separate file. Files are deleted automatically a short time after processing. For very sensitive documents, read our Privacy Policy.
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