Convert between PX and REM with custom base size. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
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16px = 1rem (the browser default). You can customize the base size to match your project's root font-size setting.
Yes. PX to REM and REM to PX conversion are both supported. Enter values in either field and the other updates instantly.
REM is relative to the root font-size, making designs scalable and accessible. Users who change their browser font-size will see your layout adapt.
Yes. Both positive and negative values, as well as decimal PX and REM values (e.g., 0.75rem, 12.5px), are converted accurately.
Yes. All calculations run in your browser. No data is transmitted.
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