Select four corner points on any planar surface in the image and transform it to a front-facing rectangle. Perfect for straightening documents, whiteboards, signs.
Apply perspective transform with 4-point selection — straighten documents and planar surfaces instantly.
All processing runs locally in your browser. Your files never leave your device — no upload, no server, no signup required.
Frequently Asked Questions
What is a perspective transform?
A perspective transform (also called a homography) maps a quadrilateral region in an image to a rectangle, correcting for viewing angle. It is widely used for document scanning, sign reading, and augmented reality.
How do I select the four corners?
Click or tap the four corner points of the planar surface you want to straighten, in order (top-left, top-right, bottom-right, bottom-left). The tool will compute the transform and produce a corrected front-facing view.
Does the output size adjust automatically?
Yes. The tool estimates the natural aspect ratio of the selected region and produces an output rectangle that preserves proportions, so text and shapes remain undistorted.
Is my image uploaded to a server?
No. All processing runs locally in your browser using WebAssembly. Your image never leaves your device — no upload, no server, no signup required.