Decimal to Hex

Decimal to Hex Converter

Convert decimal numbers to hexadecimal in bulk. Paste one number per line and each line is converted instantly: 255 becomes FF, 4096 becomes 1000, and 3054 becomes BEE. Switch the direction to turn hex back into decimal, or use the swap button to send the result back into the input.

How decimal to hexadecimal conversion works

Hexadecimal is base 16, so each digit stands for a power of sixteen. To convert by hand you divide the decimal number by 16 repeatedly and write down the remainders from last to first. For 3054: 3054 ÷ 16 = 190 remainder 14 (E), 190 ÷ 16 = 11 remainder 14 (E), 11 ÷ 16 = 0 remainder 11 (B). Reading the remainders backwards gives BEE. The converter does the same thing with arbitrary-precision integers, so even 20-digit values come out exactly.

Where you need decimal to hex

• Programming – bit masks, flags, and constants are usually written as 0x… literals.
• Colors – every RGB channel from 0 to 255 is a two-digit hex value, e.g. 209 → D1.
• Memory and debugging – addresses, offsets, and error codes such as Windows 0x80070005 are hexadecimal.
• Networking – MAC addresses, IPv6 groups, and packet dumps all use hex digits.

Options

• Uppercase – choose FF or ff.
• Prefix – add 0x so the result can be pasted straight into C, Java, JavaScript, or Python.
• Pad to full bytes – F becomes 0F, handy for byte arrays and color codes.
• Group digits – splits long hex numbers into blocks of four for readability.

Decimal fractions are supported too (10.5 → A.8), as are negative numbers (-42 → -2A). To see a value in every base at once, open the All Number Converter; for text rather than numbers, use String to Hex.