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Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

Your number

Binary: —
Octal: —
Decimal: —
Hexadecimal: —
Status: —
Very large numbers are handled exactly, without floating point rounding.

How to use the Number Base Converter

  1. Type the number you want to convert.
  2. Pick the base it is written in.
  3. Read the binary, octal, decimal and hexadecimal values below.

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Frequently Asked Questions

Common questions about the free online number base converter.

Type the number, keep the from base set to decimal, and the binary value appears in the first result row.
Yes. Conversions use arbitrary precision integers, so numbers with hundreds of digits stay exact.
The status line reports that the digits are invalid for the selected base, and the results are cleared.
The interface offers those four, which cover almost every use case in programming.
Base 16 needs sixteen symbols, so A to F represent the values ten to fifteen.
Yes, spaces and underscores are ignored, so you can paste grouped values such as 1111 0000 or 0xFF_FF.
Yes. The converter is fully responsive and works on desktop, tablet and phone.
Yes, it is completely free with no account required.

Last updated: October 10, 2026