Which aspect ratios are available?

Free-form plus the common fixed ratios — 1:1 for avatars and Instagram, 4:3, 16:9 for video and Open Graph images, and 3:2 for standard photography. Locking a ratio constrains the drag so you cannot accidentally end up a few pixels off.

Does cropping reduce quality?

The pixels you keep are untouched — cropping removes area, it does not re-sample. The only quality change comes from the output format if you export a lossless source as JPG.

Can I crop a very large photo?

Yes. The whole image is decoded in the tab, so a 50-megapixel file will use real memory and may take a moment on a phone, but there is no server-side size cap to run into.

Image Cropper

Drag a selection over the image, zoom in for precision, or lock the box to a fixed ratio like 1:1 or 16:9, then export just the region you selected. The crop is performed on a canvas inside your browser, so the full-resolution original never leaves your device.

Runs in your browser — nothing is uploaded

Questions

Which aspect ratios are available?: Free-form plus the common fixed ratios — 1:1 for avatars and Instagram, 4:3, 16:9 for video and Open Graph images, and 3:2 for standard photography. Locking a ratio constrains the drag so you cannot accidentally end up a few pixels off.
Does cropping reduce quality?: The pixels you keep are untouched — cropping removes area, it does not re-sample. The only quality change comes from the output format if you export a lossless source as JPG.
Can I crop a very large photo?: Yes. The whole image is decoded in the tab, so a 50-megapixel file will use real memory and may take a moment on a phone, but there is no server-side size cap to run into.