How this conversion works
In hexadecimal 255 is FF — two hex digits, each covering four bits. That neat one-byte-to-two-hex-digits mapping is exactly why colour codes and memory dumps use hex.
Each base just uses a different set of digits for the same quantity. Reading
255 as a decimal number gives the decimal value
255; expressing that same value in base two, eight or sixteen
produces the rows above. To convert any number between bases — including custom bases from 2
to 36 — use the number base converter.