image cropper

Crop it, turn it, mirror it.
And see what you are giving up before you do.

Give it a rectangle in your picture and it keeps that rectangle. Turn the result by a quarter, a half or three quarters, and mirror it either way. What the crop cuts away is on screen before the run, because cropping is the one thing here that cannot be undone. It runs on this page, using WebAssembly; the image never leaves your device.

Drop an image here

PNG, JPG, WebP or SVG · up to 8192px on the longest side

What to keep, and which way up

Measured in your picture’s own pixels, from its top-left corner.

The rectangle to keep

Drag the box or its handles on the picture, or type exact numbers here.

Shape
pxpxpxpx
Turn
Clockwise, in quarter turns. Nothing is lost.
Mirror
Also lossless.
QualityOne setting for every lossy format.
How this works

The turn and the mirror happen after the crop, so the numbers you type always describe the picture you are looking at rather than the one that comes out.

Everything outside the box is cut away, and there is no way back to it from the file this page hands you. Leave a field empty and it takes the rest of the picture from that edge.

A quarter turn is a rearrangement of the pixels you already have, so it costs nothing and loses nothing — which is why the list stops where it does. A free angle would open up corners that have to be filled with a colour somebody chose, and this page does not ask for one.

Mirroring both ways is the same picture as turning it upside down, and both are offered because they are different things to have meant.

Quality is one setting for the lossy encoders, not one each — the sizes below are only comparable if they were all asked for the same thing.

What this run will make

Drop a file and the rectangle it was measured at appears here, beside the one you ask for. Nothing is cropped until there is something to measure.

What came out

  • PNG
  • JPEG
  • WebP

Nothing cropped yet. Drop a file above and its measured size appears here, beside the rectangle you ask for and what that costs in bytes.

What it looks like after the change

Drop a file above and it appears here, at full size.

Questions

How do I know how much of the picture a crop throws away?

The page says so before the run. You give the rectangle in pixels and it reports what that leaves out, so a crop that quietly removes half the subject is visible as a number before it happens rather than as a surprise afterwards.

Can it turn and mirror as well as crop?

Yes. A quarter, a half or three quarters of a turn, and mirrored either way. The turn and the mirror apply to the crop you have chosen, so the order does not have to be worked out by hand.