Document Dewarp (Book Pages)

Flatten photographed book and notebook pages with curved lines, keeping colour. Flat pages use normal perspective correction.

In the browser

Processed in your browser — not uploaded

Photo of a page

Processed in your browser — not uploaded

The document is read and processed on this device. The first OCR run downloads a language model into the browser; the document itself is not sent to 1CLIK.

Your current limits

Maximum image size (megapixels): 12

Examples

Open book on a desk — Lines that bend towards the spine are pulled straight so the page reads like a flat scan.
Notebook page with a hand shadow — Even out lighting removes most of the shadow while keeping ink colours.
Flat letter photographed at an angle — Drag the corners and use the free perspective correction.

Limitations

Dewarp needs several lines of text to model the curve. Photos, drawings and very short pages fall back to perspective correction.
A two-page spread works best one page at a time: crop to one page with the corners.
Text is never cropped silently; the output keeps the full corrected page.

Troubleshooting

"Could not confidently model this page": Too few clear text lines were found. Use flat-page perspective instead, or take the photo straighter.
Lines bend the other way after dewarp: Lower the intensity slider until the lines look straight.

About this tool

Straighten photos of documents: fix the tilt of a page shot at an angle and flatten curved book pages so the lines run straight.

First the photo is measured. The tool follows the lines of text across the page and estimates how much they bend. A page that is already flat only needs perspective correction, and the tool says so instead of distorting it.

Perspective correction maps the four corners of the page to a straight rectangle. Curved dewarping models each text line, fits the bend and moves the pixels back onto straight lines, with an intensity slider for gentle or strong curves. Colours, stamps and signatures are kept; an optional illumination step evens out shadows.

The before and after views use the same measurement, so you can see the curvature drop. When confidence is low, for example a page with few text lines, the tool falls back to perspective correction and tells you why.

Quick steps

Choose a photo of a page.
Read the measurement: flat or curved, and the confidence.
Apply perspective correction or curved dewarp and adjust intensity.
Compare before and after, then download JPG or PNG.

The photo is processed in your browser and is not uploaded to 1CLIK.

FAQ

Will this make text readable on a blurry photo?

No. Dewarping fixes geometry, not focus. Retake blurry photos with more light.

Why did it say the page is flat?

The measured bend was very small. Curved dewarping would only add distortion, so perspective correction is suggested.

Does it change colours?

No, unless you turn on illumination correction, which brightens shadowed areas evenly.

Should I use this before OCR?

Yes. Straight lines improve OCR in Table Extractor and the receipt extractor.