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Decimal to Hex 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 set up to turn decimal (base 10) numbers into hexadecimal (base 16) — type a regular number and run the conversion.

The manual route is repeated division by 16, keeping the remainders as hex digits: 255 ÷ 16 is 15 remainder 15, and 15 is the digit f — so 255 becomes ff. Larger remainders 10–15 map to the letters a–f.

The full converter also goes the other way and covers binary and octal, always showing the result in all four bases. BigInt arithmetic removes any size limit, and every conversion happens privately in your 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.