Binary to hex

Four bits, one digit

Binary and hexadecimal are closely linked: 16 is 2⁴, so every hex digit stands for exactly four bits. To convert, split the binary number into groups of four starting from the right, pad the leftmost group with zeros, and replace each group with its hex digit. No arithmetic is needed beyond a 16-entry table, which is why programmers use hex as shorthand for binary.

Bits	Hex	Bits	Hex
0000	0	1000	8
0011	3	1010	A
0101	5	1100	C
0111	7	1111	F

Worked example

101010 → pad to 0010 1010 → 2 and A → 2A. 1101 1110 1010 1101 → D E A D.

The page reads the binary digits into an exact big integer and writes it in base 16, which gives the same result as grouping bits in fours from the right. Spaces and underscores in the input are ignored, and a 0b prefix is allowed. You can choose uppercase or lowercase digits and group the output by bytes. The table repeats the value in decimal and octal. Each line converts separately.