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CSS Unit Converter (px/em/rem/%)

Convert between px, em, rem and percent based on root size.

Free · Runs in your browser · Last updated

About this tool

Set a root font size and convert any value between px, em, rem and percentage units instantly.

Privacy

All processing for CSS Units happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.

Frequently asked questions

Is the CSS Units free to use?

Yes. CSS Units is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use CSS Units?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does CSS Units work offline?

Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.

Which browsers are supported?

CSS Units works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. CSS Units runs in any modern web browser with no installation, browser extension, or account required.

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