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Online CSS Utility

CSS Unit Converter

Convert between CSS length units instantly — single values or batch lines — with adjustable base font size.

100% Browser-Based — CSS never uploads to our servers. All processing runs locally in your browser.

Tool Options

Results

Results will appear here…

How It Works

Fast CSS utilities that run entirely in your browser.

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Paste or design

Paste CSS, upload a .css file, or use the visual controls. Nothing is uploaded to our servers.

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Process in browser

All parsing and generation runs locally in your browser — 100% client-side.

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Copy or download

Export CSS, TXT, JSON, HTML examples, and more instantly.

Zero server upload — your CSS stays on your device.

About CSS Unit Converter

Convert CSS units: px, rem, em, vh, vw, %, cm, mm, pt, pc, in. Batch convert with base font size and live results — free browser tool. Built for frontend developers with live preview, copy and multi-format export.

FAQs

No. All CSS tools process your content in the browser. FreeConverter servers never receive your CSS.

Yes. FreeConverter.app online CSS tools are free to use.

No account or installation is required.