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Binary to Decimal Converter

Convert numbers between binary, octal, decimal and hexadecimal — arbitrary size, entirely in your browser.

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Validating digits
Converting between bases
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Result

This page opens the number base converter with binary (base 2) as the source and decimal (base 10) as the target already selected — type the 0s and 1s and run the conversion.

Binary works in powers of two: each position doubles the one to its right. To read 1011, add the weights of the set bits — 8 + 0 + 2 + 1 = 11 in decimal.

The full tool also converts octal and hexadecimal in any direction and shows every result in all four bases at once. BigInt arithmetic means no length limit, and everything runs locally in your browser — the numbers never leave it.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Converts between base 2, 8, 10 and 16 in any direction.
  • Validates every digit against the source base and points out the offending character.
  • Accepts lowercase or uppercase hex digits, spaces and underscore separators.

Key Benefits

✓ Handles numbers of any length thanks to BigInt arithmetic — no 32-bit or 53-bit overflow, ever.
✓ Shows the converted value together with a breakdown in all four bases at once.
✓ Runs entirely in your browser: the values you convert are never uploaded anywhere.

Use Cases

  • • Translate a binary bit mask or register value into decimal while debugging code.
  • • Turn a decimal number into hex for a color value, memory address or protocol field.
  • • Check homework answers on positional number systems with exact, unlimited-size arithmetic.