CSS Unit Converter
Converts a CSS length between px, rem, em, pt, %, vw, and vh, with configurable base font size and viewport dimensions.
| px | 16 |
| rem | 1 |
| em | 1 |
| pt | 12 |
| % | 100 |
| vw | 0.8333 |
| vh | 1.4815 |
CSS Unit Converter — Free Online Tool
Converts a CSS length between px, rem, em, pt, %, vw, and vh, with configurable base font size and viewport dimensions.
How to use the CSS Unit Converter
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Is the CSS Unit Converter free to use?
Yes. The CSS Unit Converter is completely free, with no signup, no ads inside the tool, and no hidden limits.
Does the CSS Unit Converter upload my data?
No. The CSS Unit Converter processes everything locally in your browser. Your input is never sent to a server, so it stays private even on shared devices.
Does the CSS Unit Converter work offline?
After the page loads, the CSS Unit Converter runs entirely in your browser, so it keeps working without a network connection.
Free & private — why use this CSS Unit Converter
The CSS Unit Converter runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.