Image Cropper - Crop Photos Online with Custom Ratios

Cropping is the fastest way to improve a photo: it removes distractions at the edges, recomposes the subject, and — just as often — it is simply required, because the destination demands a specific shape. Social profiles want squares, video thumbnails want 16:9, classic prints want 4:3. This image cropper cuts JPG, PNG, and WebP images to any rectangle you choose, entirely inside your browser. The file is decoded locally, drawn to a canvas, trimmed to your crop box, and re-encoded on your own device; it is never uploaded, so private photos stay private. There are two ways to define the crop. The quickest is an aspect ratio preset: choose Free for an unconstrained rectangle, 1:1 for a square, 4:3 for the classic photo shape, or 16:9 for widescreen. Selecting a preset immediately places the largest possible centered crop of that shape on your image, which is almost always the starting point you want — it keeps the maximum number of pixels while guaranteeing the exact ratio. From there you can fine-tune with the numeric fields: X and Y set the top-left corner of the crop box in pixels measured from the image's top-left corner, and width and height set its size. The live preview dims everything outside the crop box so you can see exactly what will be kept before you commit. When the box is right, one click renders the cropped area to a new image and downloads it as a lossless PNG. Numeric, pixel-exact cropping is deliberately different from drag-only croppers. When a spec says "crop to 1200 × 630 starting 60 pixels from the top," dragging handles is guesswork; typing four numbers is exact and repeatable across a whole batch of images. It also makes the math transparent: for a ratio of r, the widest crop that fits is the image width or the image height multiplied by r, whichever is smaller. If you only need those numbers — say you are writing CSS, configuring a thumbnail pipeline, or preparing instructions for someone else — the crop calculator below skips the file entirely. Enter the original dimensions, pick a preset, and it returns the size and position of the largest centered crop. Everything on this page is free, requires no sign-up, adds no watermark, and works offline once loaded, because the whole tool is client-side JavaScript and canvas.