Number Base Converter

Convert between binary, octal, decimal and hexadecimal.

Decimal (base 10)

Hexadecimal (base 16)

Binary (base 2)

Octal (base 8)

Supports arbitrarily large whole numbers and negative values. Prefixes like 0x, 0b and 0o are accepted.

How to use the Number Base Converter

Convert numbers of any size between bases 2, 8, 10, 16 and any custom base up to 36.

Instant resultsEverything updates live as you type. No buttons to wait on.

PrivateYour input never leaves your browser and is never stored.

Free foreverNo signup, no limits and no paywall.

Works offlineInstall the site as an app and use it anywhere.

Is the Number Base Converter free?

Yes, it is 100% free with no signup, no watermarks and no usage limits.

Is my data private?

Yes. Everything is calculated in your browser. Nothing you type is sent to or stored on a server.

Does it work on phones and tablets?

Yes. The tool works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux.