px ↔ rem Converter
About px, rem & em Converter
Instantly convert pixel values to rem (and vice versa) with a configurable base font size (default 16px). Also converts to em and shows a lookup table of common CSS values. Perfect for responsive web design.
How To Use
- Open px, rem & em Converter and adjust the sliders, pickers, or inputs in the workspace.
- Watch the live preview update as you change values — copy the generated CSS at any point.
- Paste the snippet into your stylesheet, or tweak the controls and copy again until it looks right.
Example
Input: A few slider values or color picks.
Output: A ready-to-paste CSS snippet — box-shadow, gradient, grid, or clip-path — that matches your preview.
Who Uses px, rem & em Converter
- Front-end developers and designers who want private CSS generators that run in the browser.
- Anyone prototyping live with instant previews and no upload.
- People who need private — files and text stay on your device and are never uploaded to a server CSS tools.
Frequently Asked Questions
What is the default base font size?
Most browsers default to 16px, so 1rem = 16px. You can change the base font size to match your project's root font size.
When should I use rem vs px?
rem units scale with the user's browser font size preference, making them better for accessibility and responsive design.