px to rem: CSS Unit Converter

Convert between px, rem and pt with a custom base size.

Convert px, rem, em, pt and % in one tap — with a live type scale, a 4/8pt spacing system and cross-platform px, pt and dp, built for web and UI designers.

This app turns fiddly CSS unit maths into an instant, on-device tool. Set your own base and root font size, and every value stays true to your real design system — no browser, no calculator, no guesswork.

WHY DESIGNERS AND DEVELOPERS USE IT • Convert px, rem, em, pt and % against a custom base size • Modular type-scale generator with ready-to-paste CSS :root variables • 4/8pt spacing scale and breakpoint reference • Cross-platform sizing reference in px, pt and dp • Pin and save unlimited conversions plus full history • Works 100% offline, with light and dark themes

HOW IT WORKS

1. Set your base and root font size once
2. Type any value in px, rem, em or pt
3. Copy the result — or export a full CSS type scale

Fast, native and distraction-free, it lives on your device so there are no accounts, no ads and no tracking. Ever.

Full access unlocks with a weekly or yearly plan, or a one-time lifetime purchase.

Speed up your next design system — start converting now.

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