Why do programmers need this?

Memory addresses, color codes, bitmasks and networking all switch between bases constantly.

Does it validate input?

Yes. Typing 2 in the binary field is rejected immediately with a clear message.

Binary Converter

Convert binary, octal, decimal and hex

Binary (Base 2)

Octal (Base 8)

Decimal (Base 10)editing

Hexadecimal (Base 16)

Value

255

8 bits in binary

All four fields stay in sync as you type, with no practical size limit. Negative numbers are not supported. Everything is calculated instantly in your browser. Nothing is sent or stored anywhere.

About this tool

255, FF, 377 and 11111111 are all the same number in different bases. Developers, students and electronics hobbyists convert between them constantly.

Type in any field and watch the other three update live, with validation that catches invalid digits instantly. The fastest base converter in your browser.