Number Base Converter
Convert numbers between binary, octal, decimal, hex, and custom bases.
Works Offline
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No Login
No API
Binary (base 2)
Octal (base 8)
Decimal (base 10)
Hexadecimal (base 16)
Custom base (2–36)
About the Number Base Converter
Live-sync a number across binary, octal, decimal, and hexadecimal, plus any custom base from 2 to 36, using arbitrary-precision BigInt math so large numbers stay accurate.
Examples
Decimal 42
42Output
0b101010 / 0x2aRelated tools
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser