Number Base Converter

Type a number in any field — binary, octal, decimal or hexadecimal — and the others update instantly. Everything runs in your browser.

Binary (base 2) Octal (base 8) Decimal (base 10) Hexadecimal (base 16)

Custom base Value

About number bases

A number base (or radix) is how many distinct digits a system uses. Decimal (base 10) is what we count with day to day; computers use binary (base 2), and programmers often read memory and colors in hexadecimal (base 16) or octal (base 8) because they map neatly onto groups of bits.

This converter lets you type a value in any base and see it in all the others at once, plus any custom base from 2 to 36. It's handy for debugging, working with bitmasks, colors, permissions and low-level data. Everything is computed locally in your browser.