Straighten & Clean Scanned PDF (Deskew)
Automatically straighten crooked scanned pages and whiten the paper background — fix tilted scans, remove gray noise and shrink the file with grayscale. Runs in your browser.
How to use
- 1Upload a scanned PDF.
- 2Choose quality, background cleaning and the tilt threshold.
- 3Download the straightened PDF — the note shows how much each page was rotated.
Frequently asked questions
How is the tilt detected?
Text lines are found automatically: the page is tested at angles up to ±6° and the angle where lines line up best is used, to within 0.05°.
Will the text stay selectable?
Pages are re-created as images. Run OCR afterwards to make the text searchable again.
Is my PDF uploaded?
No — it's processed on your device.