convert

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal — arbitrarily large, one per line.

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Convert numbers between binary, octal, decimal and hexadecimal — arbitrarily large, one per line.

Fine-tune

Optional — sensible defaults are already set.

About Number Base Converter

This converter takes numbers, one per line, and shows each in decimal, hexadecimal, octal, binary and base 36. It uses arbitrary-precision integers, so 64-bit values, large hashes or long binary strings convert without rounding.

When it helps

  • Converting hex color channels, memory addresses or register values to decimal.
  • Reading Unix permission bits by converting between octal and binary.
  • Checking bit flags or masks while debugging protocol or hardware code.
  • Turning a short base 36 ID back into a number, or the reverse.

Tips

  • In Auto mode, the prefixes 0x, 0b and 0o pick the base. Input containing a to f letters without a prefix is read as hex; anything else is read as decimal.
  • Underscores, commas and spaces are ignored, so 1_000_000 and 0xFF_FF both work.
  • Binary output is grouped in blocks of 4 bits to make nibbles easy to read.
  • Only integers are supported. Fractions are not converted.

Good to know

Quick answers about number base converter in your browser.

In Auto mode, a number without a prefix and without hex letters is treated as decimal. Choose Binary or Hexadecimal as the input base, or add 0b or 0x, to read it another way.

With a minus sign in front of the magnitude, for example -0b1010. The tool does not produce two's complement, because that depends on a fixed bit width.

Yes. There is no sign-up, no watermark and no limit on how many files you process.

No. Files are read and processed locally in your browser, so they never leave your device.

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Part of the Developer Utilities collection.