Decimal to Hexadecimal Converter

Convert a decimal (base 10) number to hexadecimal (base 16). Hex packs four bits per digit, so it is the compact way to write byte values. Type a decimal number to see its hex, binary, and octal forms.

Worked example

255 (decimal) → FF (hex)

255 = 15 × 16 + 15. The digit 15 is F in hex, so 255 is FF — the largest value a single byte holds.

Decimal (Base 10)

Binary (Base 2)

Octal (Base 8)

Hexadecimal (Base 16)

Conversion details will appear here

Frequently asked questions

What is 255 in hexadecimal?

Decimal 255 is FF in hex, the maximum value of one 8-bit byte.

Why is hexadecimal used for bytes and colors?

Each hex digit maps to exactly four bits, so two hex digits describe one byte. That makes hex a tidy way to write byte values, RGB colors, and memory addresses.