PX to REM Converter — Free Online Tool

Convert px to rem and rem to px with adjustable root font size. PX to REM Converter is a free online tool from the ToolsRift CSS Generators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

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How to use PX to REM Converter

  1. Open the PX to REM Converter above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

How do I convert px to rem?

Divide the pixel value by the root font size. With the default 16px root, 24px equals 1.5rem.

What is the root font size?

The font-size set on the html element. Browsers default it to 16px, but you can change it in the converter.

Why use rem instead of px?

rem units scale with the user's root font size, making layouts more accessible and responsive.

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