Unit Converter
Convert length, weight, volume and temperature between common units.
What Is the Unit Converter?
The Unit Converter is a free online tool that lets you convert length, weight, volume and temperature between common units. It runs entirely in your browser — your text and files never leave your device, so it's fast and private. There's nothing to install and no sign-up required.
How It Works
Using the Unit Converter takes seconds. Paste or type your content into the input area (or upload a file where supported), adjust any options to fit your needs, and the result updates instantly. You can then copy the output to your clipboard, download it, or clear everything and start again. Because all processing happens locally with JavaScript, it works offline once the page has loaded.
When to Use It
Reach for the Unit Converter whenever you need a quick, reliable way to convert length, weight, volume and temperature between common units. It's popular with writers, students, developers, marketers and anyone who works with calculators day to day. Bookmark it alongside the other Calculators in our toolbox so it's always one click away.
Frequently Asked Questions
- Is the Unit Converter free to use?
- Yes. Every tool on the site is completely free, with no account, login or download required.
- Is my data private?
- Absolutely. The Unit Converter processes everything locally in your browser. Your text and files are never uploaded to a server, so your data stays on your device.
- Does it work on mobile?
- Yes. The Unit Converter is fully responsive and works on phones, tablets and desktops in any modern browser.
- Do I need to install anything?
- No installation is needed — it runs in the browser. We also offer an optional browser extension and mobile app for quick access to popular conversions.
Last reviewed: 2026-06-27