Convert between binary, octal, decimal & hex — type in any field and the rest update live, on your device, with full BigInt precision.
🔒 Files never leave your browser. All conversion runs locally with BigInt — arbitrarily large integers are exact.
Number Base Converter is a free, private text & code tool that runs entirely in your web browser. Convert between binary, octal, decimal & hexadecimal. 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 binary, hex, octal, decimal. Like every HeroTool by Digital Heroes, Number Base Converter is 100% free with no limits.
Yes — Number Base Converter is completely free for everyone. No sign-up, no account and no usage limits.
No. Number Base Converter runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.
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.
No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.
Convert between binary, octal, decimal & hexadecimal.