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Number Base Converter

Convert numbers between binary, octal, decimal, hexadecimal, and any base from 2 to 36, with accurate handling of very large values.

Best for:Reading hex and binary while debuggingWorking with colour and byte valuesLearning how number bases work
Privacy-first processingConversion happens locally in your browser using built-in big-integer support. Nothing is uploaded.
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Guide

Usage, privacy, and related tools

Best for

  • Reading hex and binary while debugging
  • Working with colour and byte values
  • Learning how number bases work

Privacy

Conversion happens locally in your browser using built-in big-integer support. Nothing is uploaded.

Quick tips

  • Hexadecimal output is shown in uppercase; input is case-insensitive.
  • Big values are handled with BigInt, so large hex numbers convert without losing precision.

How to use this tool

  1. Type a number into the value field.
  2. Pick the base your number is written in.
  3. Copy the binary, octal, decimal, or hexadecimal result.

Common questions

What bases are supported?

Any base from 2 to 36. The quick output shows binary, octal, decimal, and hexadecimal at once.

Can it convert negative numbers?

Yes. Prefix the value with a minus sign and the converted result keeps the sign.

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