Image cropper

The frame is described by three numbers: how far it is zoomed in, and where it sits in the room it has left to move, across and down. Both positions run from 0 to 1, so the frame is inside the picture by construction rather than by clamping after the fact.

At a zoom of 1 the frame is as large as your chosen ratio allows inside the picture, so one of the two sliders is locked because there is nowhere to move in that direction. Zoom in and both unlock. It is also the reason an exported crop can never contain a transparent edge or a strip of background: the frame cannot leave the image.

1:1 for profile pictures and grid posts. 4:5 as a custom ratio is the tallest a feed post usually allows. 9:16 for stories and reels. 16:9 for video thumbnails, slide backgrounds and page banners.

3:2 matches most photo prints, and 4:3 matches the classic camera and projector shape, which is still what a lot of presentation software expects.

For a printed size that is quoted in inches or centimetres, put the two numbers into the custom boxes. A 5 by 7 print is just a 5:7 ratio.

The crop keeps its own pixels. Take a square out of a 12 megapixel photo and you get roughly 3000 x 3000, not a thumbnail, which is what you want if the file will be printed or edited again. Set a limit on the longest side when you want something smaller for the web.

Cropping itself is lossless, since it only discards what is outside the frame. Quality is lost in the re-encode, so PNG output keeps every pixel exactly and JPEG output depends on the quality slider. If the file is going to be edited again later, keep the quality high or use PNG.

How do I crop an image to a square?

Pick the 1:1 ratio, then drag the frame over the part you want to keep and pinch or use the zoom slider to tighten it. The frame is locked to the ratio you chose, so the export is exactly square without any manual measuring.

Can I crop to a ratio that is not in the list?

Yes. Choose Custom and type the two numbers, for example 5 and 7 for a 5:7 print, or 21 and 9 for an ultrawide banner. The frame reshapes immediately and stays inside the picture whatever you type.

Does cropping reduce the quality of the picture?

Cropping itself only discards the area outside the frame, so the pixels you keep are the originals. Quality is lost only in the re-encode, so PNG output is lossless and JPEG output depends on the quality slider. Leave it high if the file will be edited again later.

What resolution does the cropped file come out at?

By default it is the exact pixel size of the region you selected, so a 1:1 crop from a 12 megapixel photo comes out around 3000 x 3000. You can cap the longest side if you want a smaller file, and the tool reports the final dimensions and byte count before you download.

Does it keep transparency?

Only if you export as PNG. JPEG has no alpha channel at all, so transparent areas are filled with white before encoding. The preview sits on a checkerboard so you can see which parts of your image are actually transparent.

Is the image uploaded to crop it?

No. Everything runs in your browser with the Canvas API. The picture is never sent to a server, never stored, and no account is needed.