100% private · runs in your browser
PX to REM Converter
Switch between px and rem for responsive, accessible CSS.
| Pixels | REM |
|---|
✓ Free forever✓ No sign-up✓ No watermark✓ Files never leave your device
How to use the PX to REM Converter
- Set your base font size (16px by default).
- Enter pixels or rem.
- Copy the converted value or use the table.
Rem units scale with the root font size, which is 16px by default in most browsers. Change the base size if yours differs. The same value works for em when the parent font size equals the root size.
Why use Toolbox
Private by designProcessing happens on your device. Nothing is uploaded to a server.
FastNo waiting for uploads or queues. Results appear instantly.
Works everywhereUse it on phone, tablet or desktop in any modern browser.
Truly freeNo account, no watermark and no hidden paywall.
Frequently asked questions
How do I convert px to rem?
Divide the pixel value by the base font size. With the default 16px base, 24px equals 1.5rem.
Why use rem instead of px?
Rem sizes scale with the user's font settings, which improves accessibility and makes responsive layouts easier to manage.
Is this tool really free?
Yes, always free with no sign-up, no watermark and no file limits set by us.
Are my files uploaded anywhere?
No. Everything happens inside your browser, so your files and text never leave your device.