Deskew PDF
Straighten skewed scanned pages automatically or by a manual angle.
Drag & drop your files here
or pick from your device
Supported formats: PDF
How to use
- 1
Upload your scanned PDF file.
- 2
Leave auto-detection on, or set a manual angle.
- 3
Click "Convert" and download the straightened file.
About the Deskew PDF tool
Scanned documents rarely come out perfectly straight: a sheet enters the scanner at a slight angle, and you get a file tilted a few degrees that tires the eye and confuses OCR tools. This tool detects each page's skew angle automatically and redraws it straight — or lets you set the angle manually when you want precise control.
Auto-detection analyzes text-row alignment to estimate the skew, then each page is redrawn straight on a white background. The tool runs in your browser with no upload. Deskewing before running OCR noticeably improves text-extraction accuracy, and we recommend it as a prep step for tilted documents.
When do you need this tool?
Preparing documents for OCR
Straighten scan skew before running OCR to sharply improve text-recognition accuracy.
Cleaning up archived documents
Straighten tilted documents in your archive so they look professional and consistent when viewed and printed.
Improving readability
Spare your eyes with straight documents instead of tilted pages that are hard to follow on screen.
Why ToolsRio?
Real privacy
All processing happens inside your browser. Your files are never uploaded to any server, and nobody can see them — not even us.
Free without limits
No watermark, no file-count limits, and no hidden paid tiers.
Instant speed
No waiting for uploads and downloads to a remote server — processing starts immediately on your device.
No sign-up
No account, no email, no annoying ads. Open the tool and use it right away.
Frequently asked questions
How is the skew detected automatically?+
The tool analyzes the text distribution across different angles and picks the one where text rows align most horizontally — a standard method in scanned-document processing.
What if auto-correction isn't accurate?+
You can override auto-detection and enter a manual correction angle in half-degree steps until the skew is exactly right.