Font Size Converter
NewConvert font sizes between px, rem, em, pt, and percent, with a quick reference table.
Enter a value in any unit. rem, em, and % are calculated from the base size. pt uses 1pt = 1.333px.
Common conversions
Quick lookup for popular font sizes using the current base size.
| px | rem | em | pt | % |
|---|
Frequently Asked Questions
What is Font Size Converter?
Font Size Converter is a free, browser-based tool that convert font sizes between px, rem, em, pt, and percent, with a quick reference table. No installation or account is required — it works instantly in any modern browser.
How does Font Size Converter work?
Font Size Converter processes your input locally in the browser using JavaScript. Simply paste or type your data, configure any available options, and the result is displayed immediately.
Is Font Size Converter free?
Yes, completely free. All tools on Web Developer Toolbox are free to use with no limits, no premium features, and no account required.
Does Font Size Converter work offline?
Yes. When you install Web Developer Toolbox as a Progressive Web App (PWA), all tools including Font Size Converter work fully offline via a service worker cache.
Is my data private when using Font Size Converter?
Yes. All data processing happens entirely in your browser. Nothing is sent to a server — your data stays on your device and is cleared when you close or refresh the page.