Responsive Pixel to EM/REM Converter - Professional CSS Pixel (PX) to REM/EM Unit Converter
Simplify your responsive web layouts. Bidirectionally convert pixels to root em (rem) or em, define custom base fonts (default is 16px), and preview text scale sizes live.
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How to use Responsive Pixel to EM/REM Converter Online
- Step 1: Optionally modify the Base Font Size (default is 16px).
- Step 2: Type in either the Pixel field or the REM field to convert the other value.
- Step 3: Slide and edit the preview text font-size live, then copy the CSS code.
Frequently Asked Questions
What is the difference between REM and EM?
REM is relative to the root html font-size, while EM is relative to the parent element font-size.
Why use 16px as default?
Nearly all modern web browsers default their root document font size to 16px for readability.