About the Perspective Crop
Perspective Crop turns a slanted photo of a flat thing, such as a page, a receipt, a whiteboard, a sign or a painting, into a straight, rectangular picture. You drag four handles onto the four corners of the object and the tool stretches that four-sided area into a rectangle, correcting the perspective that made the edges lean. A live preview shows the result as you drag. Three looks are available: the original colours, grey, and Clean scan, which evens out shadows and pushes paper to white and ink to black, like a scanner would. The result is saved as a JPG or PNG at up to 4,096 pixels on its longest side. The photo is processed in your browser and is never uploaded. The page cannot fix curved paper or blur, and the output shape is taken from the lengths of the edges you mark, so it may not match the exact paper size.
Updated September 2026
How to use the Perspective Crop
- 1Choose Select photo, or drop a picture of a page, receipt or whiteboard on the page.
- 2Drag the four round handles onto the four corners of the page. You can also select a handle and use the arrow keys.
- 3Check the straightened preview and choose Colour, Grey or Clean scan.
- 4Pick JPG or PNG and choose Download straightened image.
How to take a photo that straightens well
Put the page on a flat, plain surface and stand over it so the whole page is in view with a little space around each side. Good, even light matters more than the camera: avoid casting your own shadow on the paper. The tool can correct the lean of the edges but it cannot recover text that is out of focus or cut off at the edge of the photo.
Placing the corners
- Go clockwise from the top-left: top-left, top-right, bottom-right, bottom-left. The corners may not cross over.
- Put the handle on the outer corner of the paper, where two edges meet. Zoom your screen if you need to be precise.
- On a phone, use a fingertip and look at the preview on the right rather than at the handle under your finger.
- If the page is curved, for example in a thick book, place the handles on the curved edge as closely as you can. A slight bend stays.
Choosing a look
Colour keeps the picture as it is, which suits signs, paintings and whiteboards. Grey removes colour to save space. Clean scan compares each spot with the brightness around it, so a shadow over one side of a page disappears, paper turns white and ink turns black. It works well for printed pages and receipts, and less well for photos or colour drawings on the page, which it turns into high-contrast grey.
From picture to PDF
If you want a PDF, straighten each page here, save it as JPG, and then put the pictures together with JPG to PDF. For a very small file, run the result through Compress Image first. The size shown under the preview is the real size of the file you will get, so you can check it before downloading. When the page is already flat, a normal Crop Image is enough, and a stack of pages becomes one file with Scan to PDF.
Features
- Four draggable corner handles that work with mouse, finger and arrow keys
- Live straightened preview
- Output size worked out from the edges, up to 4,096 px
- Colour, grey or clean scan look
- Warning when the corners cross over
- JPG or PNG download
- Runs in your browser: photos are never uploaded
Frequently asked questions
What does perspective crop do?
It cuts out a four-sided area of a photo and stretches it into a rectangle, so a page photographed at an angle looks as if it was scanned straight on. The four corners you place decide which area is used.
Can I straighten a photo of a document on my phone?
Yes. Open the page in your phone browser, pick the photo, and drag the four handles with your finger. The controls are large enough for touch, and the preview updates as you move.
Why is my result not the exact size of an A4 page?
The tool takes the shape from the edges you mark, so it depends on where you placed the corners and on the camera angle. If you need an exact paper ratio, crop or resize the result afterwards.
What does Clean scan do?
It turns the picture grey, evens out uneven lighting and pushes paper to white and ink to black. It suits text pages. It is not meant for photographs, which lose their tones.
Is my photo uploaded?
No. The photo is read and processed in your browser, and the result is saved directly to your device.
Why does it say the corners cross over?
The four handles must go around the page in a loop: top-left, top-right, bottom-right, bottom-left. If you drag one past another, the shape twists and cannot be straightened. Drag it back.
How large can the photo be?
Up to 8,192 pixels on a side and about 16.7 million pixels in all, which covers most phone photos. The result is limited to 4,096 pixels on its longest side.