REM, PX & EM Converter
Translate CSS lengths between pixels, rem and em using a chosen base size.
Convert CSS length units
REM is relative to the root font size, while EM depends on the relevant element context.
The EM result assumes the supplied base size for a predictable conversion.
How to use the REM, PX & EM Converter
- Paste or select the source value in the expected format.
- Choose the conversion direction or output format and run the conversion.
- Review and copy the converted value, then verify it in the receiving application.
Practical example
Preview the result at several screen sizes and against the actual colors and typography used by the project.
What this tool cannot guarantee
Generated values are a starting point and should be tested for browser support, accessibility and compatibility with the full design system.
Continue this workflow with the Aspect Ratio Calculator
Frequently asked questions
Is the REM, PX & EM Converter free to use?
Yes. It is available without an account or paid subscription.
Is my input uploaded or stored?
The core operation runs in your browser. Avoid pasting secrets into any web page unless the individual tool explicitly explains how the data is handled.
Should I review the result before using it?
Yes. Check the output for your project and test it in the intended environment before production use.