How to use the hex to binary converter
- 1Type or paste the value into Hexadecimal (base 16). A
0xor#prefix and spaces are ignored. - 2Read the bits in Binary (base 2). Tick Group digits to show them in fours.
- 3Tick Keep leading zeros so every hex digit becomes exactly four bits (
0F→00001111). - 4Check Step-by-step working for the digit-by-digit lookup, then press Copy.
Example
0x1A3
Binary: 110100011 Decimal: 419 Octal: 643
1 = 0001, A = 1010, 3 = 0011. Joined: 0001 1010 0011, shown without the leading zeros unless Keep leading zeros is ticked.
Each hex digit is four bits
Because 16 = 2⁴, each hexadecimal digit maps to exactly one group of four bits, and the groups never interact. Convert digit by digit and join the results: C4 → 1100 + 0100 = 11000100. Nothing has to be carried or added, so hex-to-binary is the easiest base conversion to do by hand.
Hex-binary lookup table
| Hex | Binary | Decimal | Hex | Binary | Decimal |
|---|---|---|---|---|---|
| 0 | 0000 | 0 | 8 | 1000 | 8 |
| 1 | 0001 | 1 | 9 | 1001 | 9 |
| 2 | 0010 | 2 | A | 1010 | 10 |
| 3 | 0011 | 3 | B | 1011 | 11 |
| 4 | 0100 | 4 | C | 1100 | 12 |
| 5 | 0101 | 5 | D | 1101 | 13 |
| 6 | 0110 | 6 | E | 1110 | 14 |
| 7 | 0111 | 7 | F | 1111 | 15 |
0x prefixes and spaces
Programming languages mark hex with 0x (C, JavaScript, Python), # (CSS colours), &H (Visual Basic) or a trailing h (assembly). The converter accepts 0x and # and ignores spaces and underscores, so 0xDEAD_BEEF, #ff8800 and de ad be ef all work. Hex is not case-sensitive: ff and FF are the same value.
Hex dumps and byte strings
A hex dump such as 48 65 6C 6C 6F is a list of bytes. Paste it and the converter treats the digits as one long number; tick Keep leading zeros and Group digits so each byte keeps its full 8 bits. To read those bytes as text instead, convert them to binary and paste the result into binary to text (48 65 6C 6C 6F is “Hello”).
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