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PX ↔ REM Converter

Convert between px and rem with custom base font size — reference table and bulk converter.

Root font size (html): px

px = — rem

Reference Table

#	PX	REM	EM (at 16px parent)

Bulk PX → REM

About PX ↔ REM Converter

PX ↔ REM Converter is a free visual design tool that helps front-end developers and designers convert between px and rem with custom base font size — reference table and bulk converter with a live preview. Instead of writing CSS by hand and refreshing your browser repeatedly, use this interactive tool to experiment with values and copy the generated code directly into your project.

How to Use

Adjust the visual controls Use sliders, color pickers, and dropdowns to customize the design properties. The preview updates in real time.

Fine-tune the result Experiment with different values until the design looks exactly the way you want it.

Copy the CSS code Click the Copy button to copy the generated CSS code. It's production-ready and includes vendor prefixes where needed.

Paste into your project Add the copied CSS to your stylesheet. The code works in all modern browsers without modification.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use PX ↔ REM Converter?

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Visual Live Preview See your changes in real time as you adjust values. No more guessing what CSS properties will look like — experiment visually and copy the code.

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Production-Ready CSS The generated code is clean, optimized, and ready to paste directly into your stylesheet. Includes vendor prefixes where needed for cross-browser support.

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Faster Than Hand-Coding What takes 10 minutes of CSS trial-and-error takes 10 seconds with PX ↔ REM Converter. Adjust sliders and dropdowns instead of editing numbers in code.

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Learn CSS Visually Perfect for CSS beginners who want to understand how properties affect visual output. Experiment with values and see the relationship between code and design.

Frequently Asked Questions

rem (root em) scales relative to the root font size. If a user changes browser font size for accessibility, rem-based layouts scale proportionally. px is absolute and doesn't respect user preferences.

rem = relative to root (<html>) font size. em = relative to the parent element's font size. rem is more predictable since it always refers to the same root value.