Round Image Corners

How Round Image Corners works

Round the corners of any image with a radius you control. Rounding clips the canvas, so the corners become transparent in the PNG. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

Clipping, not drawing

A rounded rectangle is used as a clipping path, so everything outside the curve becomes transparent rather than being painted over. That is why PNG output is the right choice: JPEG cannot store the cut corners and fills them with white.

Radius runs from 1 to 400 pixels. Anything at or above half the shorter side produces a full pill or circle, since the curve cannot exceed the edge.

Radius does not scale

A 40-pixel radius on a 400-pixel avatar is a full circle; the same radius on a 4000-pixel photo is barely visible. If the image will be used at several sizes, round a copy at each size rather than one large file.

Where it is used

App icons, card thumbnails, profile pictures and any place CSS border-radius is unavailable — email templates and some CMS editors strip CSS, so the rounding has to be baked in.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions