Deskew Scanned PDF Pages
Correct slight skew in scanned or image-based PDFs with automatic detection or manual angles. Use draggable guides and a live preview to check alignment.
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Deskew Pages
📌 How it works:
1️⃣ Open a scanned or image-based PDF to straighten pages automatically or manually. The preview shows the output.
2️⃣ Auto-detect: projection histograms find the best angle within ±10° (demonstrated on the first page).
3️⃣ Coarse Rotation: if the page is off by 90°/180°/270°, click ↪️/↩️ to orient it first, then fine-tune.
4️⃣ Manual Adjustment: use the slider or input to adjust in 0.1° increments. Use ↑↓ for fine adjustments.
5️⃣ After deskewing, dark/white margins are cropped and the page is centered. The output filename ends with
⚠️ Text on deskewed image-based pages is not selectable (rasterized).
1️⃣ Open a scanned or image-based PDF to straighten pages automatically or manually. The preview shows the output.
2️⃣ Auto-detect: projection histograms find the best angle within ±10° (demonstrated on the first page).
3️⃣ Coarse Rotation: if the page is off by 90°/180°/270°, click ↪️/↩️ to orient it first, then fine-tune.
4️⃣ Manual Adjustment: use the slider or input to adjust in 0.1° increments. Use ↑↓ for fine adjustments.
5️⃣ After deskewing, dark/white margins are cropped and the page is centered. The output filename ends with
_deskewed.⚠️ Text on deskewed image-based pages is not selectable (rasterized).
Click or drop a local PDF
Usually a scanned or image-based PDF
Deskew Mode
Coarse Rotation
Current coarse rotation: 0°
Detection Result:—
Apply To
Output ResolutionOutput QualityOnly affects rasterization resolution
Preview (matches output)
Page 1 / 1
Guides (drag to check alignment):
A preview appears after you open a PDF
How to use this tool
- Open a scanned or image-based PDF.
- Correct any 90-, 180- or 270-degree orientation error, then detect skew or adjust the fine angle manually.
- Choose the current page or all pages, plus output resolution and quality.
- Check the preview guides, then click Deskew and Save.
Frequently asked questions
What does automatic detection measure?
It uses projection histograms to search for a suitable deskew angle within plus or minus 10 degrees. Manual adjustments are available in 0.1-degree increments.
Will the output keep selectable text?
This tool rasterizes the processed pages. Text on the resulting image-based pages is not selectable or searchable.