HeroTools / Productivity
Local · Private · Free

Unit Converter

Length, weight, temperature, area, volume, speed, storage & time — converted live as you type, on your device.

🔒 Calculated locally — nothing is sent anywhere.

Common length conversions

Quick reference

Accurate conversions, fully offline

Every factor here is exact (the inch is defined as 25.4 mm, a mile as 1609.344 m, and so on), and temperatures use the proper offset formulas — not naive multiplication. It all runs in your browser, so it works on a plane with no signal and never sends a thing.

About Unit Converter

Unit Converter is a free, private productivity tool that runs entirely in your web browser. Convert length, weight, temperature, area, data & more. Because everything happens locally on your device, your files and data are never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. It is handy for unit converter, length, weight, temperature. Like every HeroTool by Digital Heroes, Unit Converter is 100% free with no limits.

How to use Unit Converter

  1. Open Unit Converter — it runs entirely in your browser, with no signup.
  2. Fill in the fields or choose the options you want.
  3. Adjust the options to match exactly what you need.
  4. Copy or download your result — it is free, and your data stays on your device.

Frequently asked questions

Is Unit Converter free?

Yes — Unit Converter is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Unit Converter runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. HeroTools is a Progressive Web App — once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Unit Converter do?

Convert length, weight, temperature, area, data & more.

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