Perspective Correction Online
Fix a photo shot at an angle — map the slanted, trapezoid-shaped page back to a flat, square-on rectangle, free and in your browser.
Suelta una foto de un documento
Arrastra y suelta, pega o selecciona un archivo
JPG · PNG · WebP — escaneado en tu dispositivo
What perspective correction does
When you photograph a flat object from an angle, parallel edges appear to converge — a rectangle becomes a trapezoid. This is called keystone or perspective distortion. Perspective correction reverses it by mapping the four corners of the object back to the corners of a true rectangle.
It's the core trick behind every document scanner, but it's just as useful for whiteboards, posters, slides, paintings, and signage. This page opens with auto edge-detection so the four corners are placed for you; nudge them for a pixel-perfect fit.
How to correct perspective
- Add the photo. Drag in the angled photo, choose a file, or paste it. Edge-detection runs automatically.
- Check the corners. Make sure the four handles sit exactly on the object's corners; drag any that are off.
- Apply. The tool warps the quadrilateral into a flat rectangle. Add an enhance filter if you like.
- Download. Save the corrected image as a PNG, or as a PDF.
Precise corners, precise result
The accuracy of the correction depends entirely on the four corner points. Zoom in mentally on each corner and place the handle right on the tip — a few pixels off at a corner is the most common cause of a slightly skewed result.
More ways to scan & correct
Preguntas frecuentes
What is perspective (keystone) distortion?
It's the way a flat rectangle photographed at an angle looks like a trapezoid, with parallel edges appearing to converge. Correction maps it back to a true rectangle.
Does it only work on documents?
No. It works on any flat surface you can mark four corners on — whiteboards, posters, slides, paintings, packaging, and signs.
Is it the same as deskewing?
They overlap: deskew usually means fixing a small rotation, while perspective correction handles the full four-corner warp. This tool does both via the four corner points.
Where is my image processed?
The scan is created in your browser, so the new file is created on your own device. How any data associated with the tool is handled is described in our privacy policy.
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