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CSS Unit Converter

Convert between px, rem, em, pt, %, vw and vh.

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Input

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Settings

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Run

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Results

Results will appear here once you run the tool.

About CSS Unit Converter

Convert between px, rem, em, pt, %, vw and vh. CSS Unit Converter needs no input file — choose your settings and it generates the result straight away.

Your files stay on your device. ZyncTools has no upload step: the file is read in your browser, processed there, and handed straight back to you. There is no account, no watermark and no size cap beyond what your own device can hold.

Settings. CSS Unit Converter gives you control over value, from, root font size, parent font size, viewport width, viewport height and decimal places.

Also known as: css, px, rem, em, pt, unit, convert, responsive.

How to use CSS Unit Converter

  1. Open the tool. Open CSS Unit Converter. There is nothing to upload — it works from the settings alone.
  2. Choose your settings. Adjust value, from, root font size and the other 4 settings to suit what you need.
  3. Generate. Press Generate. The result appears immediately and updates whenever you change a setting.
  4. Save the result. Copy the output, or press Download to save it. Nothing is kept once you close the tab.

Frequently asked questions

Are my files uploaded when I use CSS Unit Converter?

No. CSS Unit Converter runs entirely inside your browser. Your file is read locally, processed on your own device, and handed straight back to you. You can confirm this yourself: open your browser's developer tools, watch the Network tab, and run the tool — no request carries your data anywhere.

Is CSS Unit Converter free?

Yes, completely. No account, no sign-up, no watermark on your output, and no cap on how many times you can use it. The project is open source under the AGPL licence.

Does CSS Unit Converter work offline?

Mostly. The site caches itself after your first visit, so it keeps working without a connection. Tools that need a specialised library — PDF editing, OCR, QR codes, MP3 encoding — need a connection the first time you run them, then that library is cached too.

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