PX to EM / REM Converter
Pixel values to em, rem and % from any base size.
Runs 100% in your browser — nothing is ever uploaded.
What is PX to EM?
Convert px to em, rem and percent from any base font size — full conversion table included. Free and 100% in your browser. Pick your options and the result is generated instantly — ready to copy straight into your project. No installation, no account and no upload: the whole process happens client-side in your browser, which keeps your data 100% private.
How to use PX to EM
- Open PX to EM in your browser — it's free and needs no account.
- Configure the options to match exactly what you need.
- Click the generate button — the result appears instantly.
- Copy the output or download it as a file for your project.
Frequently asked questions
Is PX to EM really free?
Yes — PX to EM is 100% free with no limits, no watermarks and no registration. You can use it as often as you like, on as many files or inputs as you need.
Is my data safe when I use PX to EM?
Absolutely. PX to EM runs entirely in your browser using JavaScript — your input is processed on your own device and is never uploaded to any server.
Does PX to EM work on mobile devices?
Yes. PX to EM works in any modern browser on desktop, tablet and mobile (Chrome, Firefox, Safari, Edge) — there is no app to install.
Is it safe to generate passwords in a browser?
Yes — we use the Web Crypto API (crypto.getRandomValues), the same cryptographically secure randomness source used by password managers. Generation happens on your device and nothing is transmitted or stored.
Do you see the JWT tokens I decode?
No. Decoding is pure client-side Base64 parsing — the token never leaves your browser. Still, avoid pasting production secrets anywhere as a general habit.
Are the UUIDs really unique?
UUID v4 has 122 random bits — the collision probability is so small it is negligible for any real-world system. We use the native crypto.randomUUID() implementation.