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DEC to BIN Converter Online

Converting decimal numbers to binary (BIN) is the foundation of computer science. The binary system uses only 0 and 1 to represent data.

number-base
DEC → BIN
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10

Decimal (DEC)

Convert from/to decimal number system

01

Binary (BIN)

Convert from/to binary number system

0x

Hexadecimal (HEX)

Convert from/to hexadecimal number system

0o

Octal (OCT)

Convert from/to octal number system

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Frequently Asked Questions

The number is repeatedly divided by 2. The remainders (0 or 1) are written in reverse order. For example, 13 in DEC = 1101 in BIN.
Computers work with binary data at the hardware level. Understanding binary is essential for bitwise operations, subnet masks, and low-level programming.
In binary, powers of two look like 1, 10, 100, 1000, etc. — a one followed by zeros. This helps quickly estimate data sizes: 1024 = 10000000000 (10 zeros).