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Number Base Converter

Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) instantly.

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How to use

  1. Enter a number and select its original base.
  2. Copy the result in your target base.

This example illustrates one supported operation. Choose the matching mode and settings above; generated values and formatting may vary.

Example input or settings

255 (base 10)

Example result

base 2: 11111111
base 8: 377
base 16: FF

Why is a digit invalid?

Each base allows different digits. Binary uses only 0 and 1, and octal excludes 8 and 9.