CSS Unit Converter is a free, browser-based colour and CSS design tool. Convert between px, rem, em, vw, vh, pt, cm, mm, in, and all other CSS units.
UI/UX designers, front-end developers, and graphic designers use CSS Unit Converter every day to save time and skip the overhead of desktop software or paid services. No installation, no account, and no technical knowledge required — just upload CSS Unit Converter and get results in seconds. Your files never leave your browser — full privacy by design.
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How to use CSS Unit Converter
1
Enter value
Type the value to convert.
2
Select units
Choose from and to CSS units.
3
Convert
See all unit equivalents.
Use Cases
- Quick one-off conversions without installing software
- Batch processing multiple items to save time
- Demonstrating concepts in teaching and learning contexts
- Cross-platform compatibility conversions and format standardisation
Key Benefits
- 100% free with no usage limits, watermarks, or hidden fees
- No account or sign-up required — use it instantly
- Works in all modern browsers on desktop, tablet, and mobile
- Privacy-first: all processing runs locally, files never leave your device
- Fast local processing — no server upload queues
- Batch process multiple files in one operation
- Original file is never modified — output is always a new file