Drop an image above, drag the rectangle to frame your crop, and download the result at the exact pixel size shown in the readout. Lock a ratio with the presets (1:1 for avatars, 16:9 for thumbnails, 9:16 for vertical video) or type a custom one. Cropping happens entirely on your device — the image is never uploaded to a server.
Output keeps the original format: crop a JPG, get a JPG. iPhone HEIC photos are accepted too and download as JPG. To change dimensions without cutting anything off, use the image resizer; to shrink the file afterwards, the image compressor; to switch formats, the format converter.