Deskew scanned PDF
Automatically detect and straighten tilted pages in scanned PDFs. Free, private, processed in your browser.
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- ✓ 100% free
- ✓ No sign-up
- ✓ No limits
- 🔒 Files never leave your device
How to: Deskew PDF
- Select your scanned PDF.
- Optionally set the maximum angle.
- Click Start and download the straightened PDF.
Pages fed into a scanner or photographed by phone are often slightly crooked, which looks unprofessional and lowers OCR accuracy. Deskew measures the tilt of each page and rotates it straight.
Common uses
- Straighten pages from a sheet-fed scanner.
- Clean up scanned books and archives.
- Improve OCR results by straightening pages first.
Tips for best results
- Deskew before running OCR for better recognition.
- For pages that are sideways or upside down, use Rotate PDF.
Why straight pages matter
Even a 1–2° tilt makes documents look careless and can confuse OCR software, reducing recognition accuracy and causing lines of text to merge. Deskewing corrects the angle by analysing text lines on each page.
Best workflow for scans
Deskew first, then crop margins, then run OCR PDF, and finally compress the file. Following this order gives a clean, searchable and small document.
Why use FreePDF for Deskew PDF?
| FreePDF | Typical upload-based sites | |
|---|---|---|
| Files uploaded to a server | No – processed on your device | Yes |
| Sign-up required | Never | Often for bigger jobs |
| Hourly / daily task limits | None | Common on free plans |
| Watermark on output | Never | Sometimes |
| Works offline after loading | Yes, for most tools | No |
Frequently asked questions
Are straight pages changed?
No. Pages that are already straight are kept exactly as they are.
Are straight pages changed?
No. Pages that are already straight are kept exactly as they are.
Is Deskew PDF really free?
Yes. Every tool on FreePDF is 100% free with no file limits, no sign-up and no watermarks. The site is supported by unobtrusive ads.
Are my files uploaded to a server?
No. FreePDF processes your files directly in your browser using JavaScript. Your documents never leave your device, so they stay completely private.
Does it work on mobile?
Yes. FreePDF works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.