CSS Unit Converter
Convert a pixel value into rem, em, vw, vh and pt using the root size and viewport width.
📐CSS Unit Converter
All processing happens locallyWhat this tool does
CSS Unit Converter is a text utility running entirely in the browser that stays responsive on large inputs., processing happens locally with live preview, and the source text is never uploaded or stored.
normalise line endings first (mixed \r\n and \n skews counts) and chunk very long texts.
How to use it
- Paste or type your content into the input field at the top, or press the sample button to load demo data.
- Adjust the options below the input, such as output format, separators, letter case or precision.
- Press the main button to run the conversion. Results appear instantly in the output panel without a page reload.
- When the result looks right, use the copy button in the corner, or download it as a local file.
Tips and notes
Clean up stray spaces and line breaks before pasting for more accurate results.
FAQ
By default yes; only the compress, drop-empty or normalise options change them.
Yes. The tool is completely free with no usage limits, and you never need an account or a sign-in.
No. All processing runs locally in your browser, so the input never reaches a server and is never logged or stored.
Yes. The layout is mobile-first, so inputs and buttons stay comfortable on phones and tablets in both orientations.
Yes. A copy button in the output panel puts the result on your clipboard, and you can also download it as a text file.