CSS Font Size Converter
Convert px, rem, em and typographic points with explicit base sizes.
How to use this tool
- Enter values or select a file in the labelled controls.
- Select the action button and review the result.
- Copy the result or use its download control when available.
rem uses the root size; em uses the selected parent size. CSS uses 96 px per inch and 72 pt per inch. The result does not inspect a live page’s computed styles.
Processing takes place in this browser. Your entries are not sent to a conversion service.