Number Base Converter

Why Convert Number Bases?

Binary, octal, decimal, and hexadecimal all describe the same quantity in different radixes. Developers move between them constantly — reading memory addresses, bitmasks, file permissions, and colour codes. Our converter keeps all four in sync as you type, using arbitrary-precision math so even very large numbers convert without rounding errors.

Features

  • Four linked fields — binary, octal, decimal, hexadecimal update together.
  • Arbitrary precision — backed by BigInt, no 2^53 precision loss.
  • Negative number support — signed values convert correctly in every base.
  • Inline validation — invalid digits for the current base are flagged immediately.

Common Use Cases

  • Converting Unix file permission bits between octal and decimal.
  • Reading hexadecimal memory addresses or colour values as decimal.
  • Working with bitmask flags defined in binary.

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