Hexadecimal
What is Hexadecimal?
Hexadecimal (base-16) uses digits 0-9 and letters A-F, where A=10 through F=15. Each hex digit represents exactly 4 bits, so one byte (8 bits) is always two hex digits: ASCII "A" is 0x41 (4 = 0100, 1 = 0001).
This clean 4-bit alignment is why hex dominates computing notation. CSS colors use 6 hex digits (#FF5733 = red 255, green 87, blue 51). Memory addresses display in hex. Unicode code points are written as U+0041. Network protocol dumps show hex bytes. Convert between hex and other formats with our hex-to-ASCII tool or base converter. You can also look up any character by its hex value on the ASCII table.
This clean 4-bit alignment is why hex dominates computing notation. CSS colors use 6 hex digits (#FF5733 = red 255, green 87, blue 51). Memory addresses display in hex. Unicode code points are written as U+0041. Network protocol dumps show hex bytes. Convert between hex and other formats with our hex-to-ASCII tool or base converter. You can also look up any character by its hex value on the ASCII table.