PX ↔ REM / EM Converter — Precise CSS unit tooling
Instantly convert pixel values to rem or em and back. Adjust the root font size, use standard presets, copy results to clipboard and export templates for your design system. Built for developers and designers who value precision and accessibility.
Try the converter now without signing in — quick conversions and copy-to-clipboard available.
Why use relative units — practical benefits
Relative units like rem and em make scaling and accessibility simple. Our tool helps you translate legacy pixel-based styles into scalable units so your UI adapts to user preferences and device settings.
Conversions
• PX → REM: px ÷ rootFontSize
• REM → PX: rem × rootFontSize
• EM conversions use parent font size
Presets & templates
• Standard roots: 16px, 14px, 10px
• Typography scales and spacing presets
• Exportable template for design systems
Workflow
• Copy-to-clipboard with unit suffix
• Batch conversions via CSV (dashboard)
• Save and reuse presets
Accessibility
• Respect user font-size settings
• Easier scaling for readers and low-vision users
• Centralized control through root font size
Templates & Code snippets — ready for production
Instead of graphs, we provide ready-made templates and code snippets for quick integration. Apply a base scale, paste the snippet into your CSS or design tokens, and keep consistency across your project.
