Deskew Scanned PDF
Free deskew scanned PDF tool — straighten crooked, rotated scans page by page with auto-estimate or a manual angle slider, then rebuild a tidy PDF.
About the Deskew Scanned PDF
Documents scanned on a flatbed or phone often come out slightly tilted, which looks unprofessional and hurts OCR accuracy. This free deskew tool renders each page of your scanned PDF, detects the skew angle and rotates the page so text sits straight again.
You can let the tool auto-estimate the angle or fine-tune it with a manual slider, then rebuild a clean, straightened PDF. All rendering and correction happens in your browser, so your document is never uploaded.
How to Use the Deskew Scanned PDF
- 1Upload your scanned PDF, or drag it onto the drop zone.
- 2Let the tool auto-estimate the skew, or set the angle manually.
- 3Preview the straightened pages to confirm the correction.
- 4Download the deskewed PDF, or reset to try another file.
Frequently Asked Questions
How does automatic deskew work?
The tool rasterizes each page and analyses the dominant text lines to estimate how far the page is tilted, then rotates it back to level. You can override the estimate with the manual slider if needed.
Will deskewing reduce the scan quality?
Rotation involves re-sampling the page image, so there can be a very slight softening. Keeping the correction angle small and the render resolution high preserves clarity.
Does this improve OCR results?
Yes. OCR engines read straight text far more reliably, so deskewing a crooked scan before running text recognition usually improves accuracy.
Is my PDF uploaded to a server?
No. The pages are rendered and rebuilt entirely in your browser, so your document stays on your device.