Number Base Converter

Enter a number in any base and instantly see its binary, octal, decimal and hexadecimal representations.

All conversions happen in your browser.

How to use Number Base Converter

  1. Choose the base of the number you are entering.
  2. Type the number.
  3. All four representations update instantly.
  4. Copy any value you need.

About this tool

Programmers constantly move between bases: binary for bit operations, hex for memory addresses and colours, decimal for everything else. This converter keeps all four views in sync so you never have to do the arithmetic by hand.

It uses arbitrary-precision integers, so even very large values — like 64-bit numbers — convert exactly.

Frequently asked questions

Can it convert large numbers?
Yes. The tool uses BigInt arithmetic, so values far beyond 32-bit and 64-bit ranges convert exactly.
Does it handle fractions or negative numbers?
Negative integers are supported (shown in two’s complement for binary only when the bit width allows). Fractions are not supported — this tool works with whole numbers.

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