Number Base Converter

Convert numbers between Binary, Decimal, Octal, and Hexadecimal instantly.

Free Runs in your browser Converters

How to use

  1. 1 Type your number in any of the four fields: Binary (base 2), Octal (base 8), Decimal (base 10), or Hexadecimal (base 16).
  2. 2 All other fields update instantly as you type — no button required.
  3. 3 Select and copy any output field value to use it in your code or shell command.
  4. 4 Use it for bit manipulation, color hex values, memory addresses, or any base conversion between these four bases.

Key features

  • Converts between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16)
  • Real-time: type in any field and all others update instantly
  • Validates input per base — shows a clear error for invalid characters
  • Useful for low-level programming, color hex values, and bitwise operations