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Straighten a scan auto-deskew

Last updated: July 2026

Is your scan tilted or shot at an angle? ScanReviver squares it up: perspective correction for angled photos, small-angle deskew so text runs level, and 90° rotation, then a clean download.

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Two kinds of crooked, both fixed

A crooked scan is usually one of two things: the whole page was shot at an angle (perspective), or it is only slightly rotated so the text tilts (skew). ScanReviver handles both, detecting the page corners for perspective and levelling small tilts so lines of text run horizontally.

How to straighten a scan

  1. Upload the photo or scan (JPG, PNG, WebP or HEIC).
  2. Check the detected corners and drag them onto the page if needed.
  3. Use Rotate left/right for a sideways or upside-down page.
  4. Preview to confirm the text runs level, then download JPG, PNG or PDF.

Straighten, then clean

Straightening pairs naturally with cleanup: once the page is square, evening out the lighting and whitening the background makes a much bigger difference. Continue with clean a scanned document or enhance a scan. To flatten a page shot at a steep angle, the same corner-drag does the work.

ScanReviver improves readability; it does not use generative AI and never rewrites text, changes numbers, edits dates or recreates signatures or stamps. Very dark shadows, text hidden under a finger, glossy glare and severe blur can still look imperfect, so always check the result before you rely on it.

Common questions

Does it straighten automatically?

It detects the page and corrects perspective and small tilts automatically, and you can drag the four corners to fine-tune before downloading.

Can it rotate a sideways page?

Yes. Use Rotate left or Rotate right to turn a sideways or upside-down page in 90° steps.

What if auto-detection misses the page?

You place the four corners yourself by dragging them onto the page; the crop and straighten then follow your corners.

Is it free?

Yes: no account, no watermark, no daily cap. Your upload is deleted right after processing.