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Hex to Decimal Converter

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

Processing... 0%
Validating digits
Converting between bases
Done

Result

This page opens the number base converter with hexadecimal (base 16) as the source and decimal (base 10) as the target — paste a hex value, lowercase or uppercase, and run it.

Hexadecimal uses sixteen digits, 0–9 then a–f, and each position is a power of 16. So ff means 15 × 16 + 15 = 255, and 1a3 means 1 × 256 + 10 × 16 + 3 = 419.

Beyond this pair, the full tool converts between binary, octal, decimal and hex in any direction, with a breakdown in all four bases and no length limit. Everything is computed locally — your values never leave the browser.

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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.