Number Base Converter — free online
Sometimes a number shows up in the wrong shape. A color code in hex, a flag in binary, a value your code spat out in octal — and you just need it back in plain decimal so it makes sense. Doing that math by hand is fiddly and easy to get wrong. We added a free tool that does it for you — Number Base Converter — right in your browser.
What it does
It converts numbers between binary, octal, decimal and hexadecimal, all at once. Type a value in one base and you see it in the others straight away. It also handles text: turn a word into binary, or read binary back into text.
Nothing leaves your device
The whole thing runs inside your browser. Whatever you type stays on your screen — nothing is uploaded anywhere and nothing is saved. When you close the tab, it's gone.
How to use it
- Open Number Base Converter.
- Type your number in the base it's already in (binary, octal, decimal or hex), or paste some text.
- Read the converted result and copy whichever one you need.
It's free with no limit. There are more small tools on the Apps page.