Is CSS Unit Converter free to use?

Yes, CSS Unit Converter is completely free. No registration, no account, and no hidden costs — ever.

Is my data safe when using CSS Unit Converter?

All processing happens directly in your browser. Your data never leaves your device — nothing is uploaded or stored on our servers.

Do I need an account to use CSS Unit Converter?

No. All CheckTown tools work instantly without registration or sign-up.

Can I use CSS Unit Converter on my phone?

CSS Unit Converter works on any device — desktop, tablet, or phone. The interface adapts to your screen size.

CSS Unit Converter

Convert between CSS units with configurable base font size

Settings

Base font size (px)

Viewport width (px)

Viewport height (px)

Value

Converted Values

—

rem

—

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CSS Unit Converter: px, rem, em, and More

Convert between CSS units and understand when to use px, rem, em, vw, and vh.

What Are CSS Units?

CSS units define the size of elements on a web page. They fall into two categories: absolute units (px, cm, mm, in, pt, pc) that have fixed physical sizes, and relative units (rem, em, vw, vh, vmin, vmax, %) that scale based on context like font size or viewport dimensions.

5 min readRead full guide

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