Convert DECIMAL to HEX, Free
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How to convert DECIMAL to HEX
Hexadecimal (base 16) is the standard notation for memory addresses, byte values, color codes, and binary protocol fields. Programmers convert decimal to hex constantly when reading CPU registers, debugging network packets, specifying HTML colors, or writing low-level code. The algorithm divides the decimal number by 16 repeatedly, collecting remainders (0-15, represented as 0-9 and A-F) from bottom to top. This converter runs that arithmetic instantly in JavaScript without sending anything to a server.
One practical use is HTML and CSS color codes. The color #3A8FC2 is three decimal values concatenated in hex: red=58 (3A), green=143 (8F), blue=194 (C2). Another common case is IP and MAC address fields in networking tools, where individual octets are presented in hex. Understanding the decimal-to-hex mapping helps you read these values fluently rather than treating them as opaque strings.
Enter a decimal number
Type any non-negative integer. Large numbers (up to 2^53) are supported by JavaScript's safe integer range.
Get the hex output instantly
The hexadecimal equivalent appears as you type. Letters are shown in uppercase (A-F) by default.
Toggle uppercase/lowercase
Switch between 0xAB2F and 0xab2f output. Both are equivalent; the choice is a style preference.
Copy for use in code
The result can be copied with or without the 0x prefix. Add 0x when using in C, Java, Python, or JavaScript hex literals.
Frequently asked questions
How does decimal to hex conversion work?
Divide the number by 16, record the remainder as a hex digit (0-9 or A-F), then divide the quotient by 16 again. Repeat until the quotient is zero. Read the remainders in reverse order for the hex result.
What does the 0x prefix mean?
0x is a programming convention that signals the following number is in hexadecimal. It is not part of the numeric value itself, just a notation prefix used in code.
How do I convert a decimal color component to hex?
Each RGB color component is a decimal 0-255. Convert each to a two-digit hex: 0=00, 128=80, 255=FF. Concatenate to get a 6-character color code like #8000FF.
Why does 255 convert to FF in hex?
255 = 15x16 + 15. Both remainders are 15, which maps to F. So 255 in hex is FF. This is why a full-brightness color channel is FF.
Can I convert negative decimal numbers to hex?
The tool handles positive integers. Negative numbers in hex are typically represented using two's complement notation, which depends on the bit width (8, 16, 32, 64-bit) of the target system.