Cropping an image by dragging a selection
Upload an image, then click and drag directly on the preview to mark the area you want to keep. Click "Crop selection" to extract exactly that region at full original resolution, and download the result as a PNG. Everything happens locally in your browser using canvas - your image is never uploaded anywhere.
Why the crop preserves full resolution
The selection you drag is scaled from the on-screen preview size back to the image's true original pixel dimensions before cropping, so the extracted region comes out at full original quality rather than at whatever smaller size the preview happened to display at - useful since preview images are often shown smaller than their actual file dimensions simply to fit on screen.
Common reasons to crop before using an image
Removing distracting background from a product photo, pulling a square section out of a landscape photo for a social media profile picture, or isolating one person from a group photo - cropping is often the single most useful edit for making an image fit a specific use case without needing full photo-editing software.
Redoing or adjusting your selection
A new click-and-drag on the same uploaded image replaces whatever selection you drew previously, so you can try several different crop areas on the same source image and download each result separately before settling on the one you want.