Number Base Converter

Convert between binary, octal, decimal and hexadecimal. Free, no sign-up, works in your browser.

🔒 100% private — processing happens in your browser. Nothing is uploaded.

How to use the binary hex decimal converter

  1. Type a number in any field — decimal, hexadecimal, binary, octal or a custom base 2–36.
  2. All other fields update instantly.
  3. Very large numbers are supported exactly (no rounding).

Programmers use hex for colours and memory addresses, binary for bit flags and octal for Unix permissions. This converter uses arbitrary-precision integers, so even 128-bit values convert without losing digits. Prefixes like 0x, 0b and 0o and separators like spaces or underscores are accepted.

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