Upload an image, then drag the four corners onto the object
Straightened image
Your straightened image will appear here
Straighten angled photos by dragging four corners — flatten documents, whiteboards, and signs into a clean, straight-on view.
Free online tool
Upload an image, then drag the four corners onto the object
Your straightened image will appear here
Follow these 4 simple steps to get a flat, straightened result
Click "UPLOAD IMAGE" to select a photo from your device, or click "Use demo image" to try the tool right away. Every crop happens locally in your browser — your image is never uploaded anywhere.
Drag each of the four green handles onto the actual corners of the document, whiteboard, sign, or object you want to straighten - the red outline shows the quadrilateral that will be flattened.
Click the red "STRAIGHTEN IMAGE" button. The tool warps that quadrilateral into a flat rectangle and shows the result on the right.
Click "DOWNLOAD IMAGE" to save your straightened photo as a PNG, ready to use anywhere.
Perspective crop is a free, browser-based tool for correcting perspective distortion - the skewed, keystoned look you get when you photograph something flat from an angle instead of straight-on. Drag the four corners onto a document, whiteboard, painting, sign, or any other flat object, and the tool flattens it into a straight-on view, just like a document scanner. It supports JPG, PNG, and WEBP images, and because everything runs locally in your browser, straightening is fast, private, and never consumes any upload bandwidth.
Drag each corner handle precisely onto the object's edges - not a simple rectangle crop, a real perspective dewarp.
Every output pixel is computed directly from an exact perspective transform, so the result is smooth with no visible seams or tearing.
Choose Auto to estimate the shape from your corners, or force A4, Square, or 16:9 output.
Drag the corner handles with a mouse on desktop or your finger on mobile - both work identically.
Every feature is free, with no hidden fees, sign-ups, or watermarks. Straighten as many images as you like.
All processing happens locally in your browser. Your images are never uploaded to, stored on, or seen by any server.
Perspective crop (also called perspective correction or dewarping) fixes the distortion you get when you photograph something flat - like a document, whiteboard, or sign - at an angle instead of straight-on. It warps the tilted quadrilateral back into a flat, front-on rectangle, rather than simply cutting out a rectangular region like a normal crop.
Click "UPLOAD IMAGE" to choose a photo (or "Use demo image" to try it instantly), drag each of the four green handles onto the actual corners of the document, then click "STRAIGHTEN IMAGE". The tool warps that quadrilateral into a flat rectangle and shows the result on the right, ready to download.
The straightened output's size is estimated from the quadrilateral you draw (or reshaped to a preset like A4 or 16:9 while keeping roughly the same pixel area), and every pixel is sampled directly from your original photo's full resolution, so detail stays sharp rather than being blown up or needlessly shrunk.
No. The tool computes the exact mathematical perspective transform for your four corners and samples every output pixel individually and smoothly from the source photo, rather than stitching together separate warped pieces — so the result is a single, clean, seam-free image.
Yes. The corner handles respond to touch as well as mouse input, and the tool runs entirely in your browser — you can upload a photo from your phone's gallery and drag the corners with your finger.