developer tools › number base converter

Number Base Converter

Convert between decimal, binary, hexadecimal, and octal. Real-time, browser-only, no server.

Decimalbase 10
Binarybase 2
Hexadecimalbase 16
Octalbase 8
bidirectionaltype in any field — all others update instantly
browser-onlynothing sent to any server, ever
bit widths8 / 16 / 32 / 64-bit binary representations
prefix toggleshow 0x, 0b, 0o for copy into source code
no adsno tracking, no signup, no rate limits
free foreverpart of 52 free tools at tools.voiddo.com

voiddo tools Pro — $9 one-time

Supports all 52 free tools including numberbase. Perpetual license · no subscription · funds the next batch of tools.

compare: numberbase vs rapidtables.com/convert/number/ →

Common conversions reference

Decimal Binary Hex Octal Common use
00000 0000000null byte
100000 1010A12LF newline
1270111 11117F177int8 max / DEL char
2551111 1111FF377uint8 max / 8-bit mask
2561 0000 00001004002^8 / next byte
655351111 1111 1111 1111FFFF177777uint16 max
42949672951111...1111 (32)FFFFFFFF37777777777uint32 max