Developer tools
CSS px ↔ rem converter
Convert pixel values to rem, em, and % using your root font size.
rem
1rem
em
1em
%
100%
Your data never leaves the browser.
How it works
- Enter a pixel value.
- Set the root font size (usually 16).
- Copy rem, em, or %.
FAQ
- Is data uploaded?
- No. Everything runs in your browser.
- Do I need an account?
- No. These tools work without signing in.