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Number Base Converter

5 tools

Convert between binary, octal, decimal, and hex.

Runs in your browser — your files and text stay on your device

Convert numbers between binary, octal, decimal and hexadecimal. Type a value in any base and see the others update. It's a common need for programming, networking and digital electronics.

Unit ConverterNumber Base ConverterCSV ↔ JSONRoman Numeral ConverterCooking Measurement Converter
Binary
11111111
Octal
377
Decimal
255
Hexadecimal
ff

How to convert a number's base

  1. 1Type a number into the Value field.
  2. 2Pick the base it's currently in.
  3. 3All four bases update instantly.
  4. 4An error appears if the value has an invalid character for that base.

Frequently asked questions

What bases are supported?

Binary, Octal, Decimal, and Hexadecimal, all shown at once.

Does it handle negative numbers?

No — only non-negative whole numbers.

Is this done on a server?

No — plain JavaScript math running in your browser.

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