CSS border radius generator

Preview a rounded box.

Runs on your device Works offline after setup All Design tools

Input

Limits

The preview uses the values you type. It does not upload them.
Desktop limits are provisional. Physical mobile and Safari verification remains open.

What happens to your data

CSS border radius generator runs inside this browser tab, and the page's code comes from this site. There is no application server to receive your data, and the site's security policy limits connections to this site.

How local processing works

Good to know

The preview uses the values you type. It does not upload them.
Desktop limits are provisional. Physical mobile and Safari verification remains open.