Hexadecimal to Binary Converter

Convert hexadecimal numbers to binary (base 2) instantly.

Hexadecimal Input

Binary Output

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Binary to Hexadecimal Converter

Hex to Binary Lookup Table

0=0000

1=0001

2=0010

3=0011

4=0100

5=0101

6=0110

7=0111

8=1000

9=1001

A=1010

B=1011

C=1100

D=1101

E=1110

F=1111

Code Examples

const hex = "FF";
const decimal = parseInt(hex, 16);
const binary = decimal.toString(2); // "11111111"

Frequently Asked Questions

How do I convert hex to binary?

Each hex digit converts to exactly 4 binary digits. Use a lookup: 0=0000, 1=0001... 9=1001, A=1010, B=1011, C=1100, D=1101, E=1110, F=1111.

Why is hex to binary conversion so easy?

Because 16 is a power of 2 (2⁴), each hex digit corresponds to exactly 4 bits. No arithmetic is needed - just replace each hex digit with its 4-bit pattern. That is why programmers use hex as a compact way to write binary.

How many bits are in a hex number?

Multiply the number of hex digits by 4. A 2-digit hex value like FF is 8 bits (one byte), 8 hex digits are 32 bits, and 16 hex digits are 64 bits.