Perspective Correction Online

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

1. Add the photo. Drag in the angled photo, choose a file, or paste it. Edge-detection runs automatically.
2. Check the corners. Make sure the four handles sit exactly on the object's corners; drag any that are off.
3. Apply. The tool warps the quadrilateral into a flat rectangle. Add an enhance filter if you like.
4. 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.