Is the CSS Unit Converter private?

CSS unit conversion is local to your browser.

What can I use the CSS Unit Converter for?

Design tokens, Responsive CSS, Spacing calculations are common uses. The tool runs in your browser so it is suitable for quick checks and sensitive snippets.

Does HappyFormatter store CSS Unit Converter input?

No. HappyFormatter's utility tools process pasted input in the browser tab and do not store it on a server.

Private browser utility

CSS Unit Converter

Convert px, rem, and em values locally in your browser with a configurable base size.

What this tool is good for

Convert px to rem/em and rem/em back to px.

Use a base font size from the input when provided.

Keep design token calculations quick and local.

CSS Unit Converter

What this tool is good for

Web

HTML

Vue

Svelte

Astro

Angular

Handlebars

Jinja

Twig

CSS

JavaScript

TypeScript

SCSS

Sass

Less

Data

JSON

JSONC

JSON5

XML

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TOML

SQL

GraphQL

Proto

Markdown

MDX

Runtime

Python

PHP

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Java

Lua

Shell

Rust

Systems

C

C++

C#

Objective-C

Zig

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