Crop Images Online

How to crop an image — 3 steps

1. 1

   Open your image

   Drop in a JPG, PNG, or WebP file. It is decoded in the browser, so the full-resolution original is what you are working on — not a downscaled preview uploaded to a server.

2. 2

   Drag the crop box

   Pull the handles to frame the area you want. Lock an aspect ratio when the result has to fit a fixed slot — a 1:1 avatar, a 16:9 thumbnail, a 4:5 portrait post.

3. 3

   Apply and download

   Everything outside the box is discarded and the cropped image is saved at full quality. The original file on your disk is untouched.

Cropping, aspect ratio, and the platforms that impose one

Most cropping is really about aspect ratio — the proportion between width and height — because so many places display images in a fixed shape. If you upload a landscape photo where a square is expected, something has to decide what to discard, and that something is usually an algorithm that crops to the centre and cuts off whatever mattered. Cropping deliberately beforehand means you choose what survives.

The ratios worth knowing are the ones that recur: 1:1 for profile pictures and most grid thumbnails, 16:9 for video thumbnails and slide decks, 4:5 for the tallest portrait image most social feeds will show without cropping, and 3:2 or 4:3 for standard photographic prints. Setting the ratio before you drag means the frame you see is exactly the frame that will be shown.

There is also a composition point hiding in here. The default instinct is to centre the subject, but photographs usually read better when the subject sits about a third of the way across the frame rather than dead centre, and when there is more space in front of a person's gaze than behind it. Cropping is often the cheapest way to fix a photo that felt slightly wrong without knowing why.

Cropping reduces file size — and it is not reversible

Cropping is one of the more effective ways to make an image smaller, because file size scales with pixel count. Cutting away the outer third of an image in both directions removes over half its pixels, and the file shrinks roughly in proportion — usually with a better-looking result than achieving the same saving by compressing the full frame harder.

The important caveat is that this tool crops destructively: the pixels outside the box are gone from the exported file. That is different from the non-destructive crop in an editor like Lightroom or Photoshop, where the original is preserved and the crop can be adjusted indefinitely. Keep your original if there is any chance you will want a wider frame later.

One more thing worth checking before you crop hard: how many pixels are left. An image that ends up 300 pixels wide will look soft on a modern high-density display showing it at 300 points, and will not print at any useful size. As a rough guide, aim to leave at least twice the pixel dimensions of the space the image will occupy on screen.

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