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CSS Unit Converter

Convert pixel values to rem, em, vw and vh (and back) based on a configurable root font size, with an instant visual preview.

Your data is processed locally in your browser

How to Use the CSS Unit Converter

  1. 1Set your root font size (default 16px).
  2. 2Enter one or more pixel values, one per line.
  3. 3View the converted rem, em, vw and vh values instantly.

Frequently Asked Questions

What root font size does the conversion use?+

16px by default, matching most browsers, but you can change it to match your project's base font size.

Can I convert multiple values at once?+

Yes, enter one value per line and every value is converted simultaneously.

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