CSS Unit Converter
Online CSS unit conversion tool
Overview
A practical CSS unit converter supporting conversions between px, rem, em, vw, vh, and percentages. Customize the root font size, batch convert multiple values — an essential tool for responsive frontend development.
Features
- px to rem conversion
- px to em conversion
- px to vw/vh conversion
- rem to px conversion
- Percentage unit conversion
- Batch conversion of multiple values
- Custom root font size
How It Works
- Enter the value to convert in the input field
- Select the source unit (px, rem, em, vw, etc.)
- Select the target unit
- Set the root font size if converting between px and rem
- Review the conversion result and copy for use
Tips
- Batch converting design px values to rem significantly boosts development efficiency
- For mobile adaptation, use vw units for proportional scaling
- When using rem, ensure the root font size matches your design specifications
FAQ
What is the difference between rem and em?
rem is relative to the root element (html) font size, while em is relative to the parent element font size. rem is more predictable; em is useful for component-level scaling.
Why do I need to convert CSS units?
Responsive design requires adapting layouts across screen sizes. Using relative units like rem/vw ensures better cross-device compatibility.
What root font size should I use?
The browser default is 16px, which most frameworks also use as the baseline. Adjust to match your design spec but keep it consistent.
Tags
CSSUnitConvert