Crop Image

Cropping trims the edges of a picture to frame the subject or to meet a required shape — a square profile photo, a 4:5 Instagram post, a 16:9 thumbnail or a 9:16 story. This cropper works with exact numbers rather than dragging: choose a ratio and which part to keep, or type a box in pixels or percent, and apply it to one image or a whole batch. It runs in your browser, so the files are not uploaded.

How to use this tool

1. Choose your images.
2. For a shape, pick “Aspect ratio”, a ratio and the part to keep (centre, top, a corner…). Lower the crop size below 100% to zoom in.
3. For a precise area, pick “Exact box” and enter left, top, width and height in pixels or percent. The crop guide’s 10% grid helps you read the numbers.
4. Keep the original format or choose JPG, PNG or WebP, then download the cropped files.

Formula

Largest crop of ratio R = w:h inside W × H: if W ÷ H > R, height = H and width = H × R; otherwise width = W and height = W ÷ R

The crop size percentage scales that box. The anchor places it: left = (W − width) × a, top = (H − height) × b, where a and b are 0 for left/top, 0.5 for the centre and 1 for right/bottom. Pixels inside the box are copied one to one, so no quality is lost beyond saving the file.

Example

A 4000 × 3000 px photo cropped to 1:1 at the centre gives the largest square, 3000 × 3000 px, starting at x = 500. The same photo at 16:9 anchored to the top gives 4000 × 2250 px from y = 0, and at 4:5 it gives 2400 × 3000 px from x = 800.