Number Base Converter

Convert a number between decimal, hex, binary, octal or any base, and edit its bits

Decimal base 10

Digits 0 to 9, or a number with a 0x, 0b or 0o prefix.

Hexadecimal base 16

Digits 0 to 9 and letters a to f.

Binary base 2

Only 0 and 1.

Octal base 8

Digits 0 to 7.

Other base

Uppercase letters

Group digits with _

Prefixes 0x, 0b, 0o

Type in any field. Whole numbers of any size, negative ones included; spaces and _ are ignored. Digits above 9 are the letters a to z, so base 32 here is not the Base32 encoding of RFC 4648.

Bits

Auto 8 16 32 64 128

Click a bit to flip it. A negative number is shown in two's complement.