Converters

Binary Converter

Decimal ↔ binary, and text to binary.

Decimal (base 10)

Binary (base 2)

Hexadecimal (base 16)

Octal (base 8)

Group binary into 4-bit nibbles

This free binary converter works two ways. In Number ↔ Binarymode, type into any of the decimal, binary, hexadecimal or octal fields and the other three update live — every field is editable, so you can convert in any direction, and an optional toggle groups binary into readable 4-bit nibbles. In Text ↔ Binary mode it turns text into 8-bit UTF-8 byte codes (and back), with a choice of space, comma or no separator. Negative whole numbers are supported and arbitrarily large values are handled exactly with BigInt. It's a handy companion for programming, digital electronics and computer-science study.