Does it work with big numbers?

Yes. The conversion uses arbitrary-precision math, so numbers with hundreds of digits convert without rounding errors.

Can I paste numbers with a prefix, like 0x1F or 0b1010?

Yes. The 0x, 0b and 0o prefixes are accepted in the hexadecimal, binary and octal fields. Spaces between digits are ignored too.

Type a decimal number and see its value in hexadecimal, plus binary and octal. Useful for colors, memory addresses and programming.

Tool

Everything is processed in your browser. Your text and files are never sent to a server.Questions about this tool?

Convert decimal numbers to hexadecimal instantly, and to binary and octal too. Accepts numbers of any size. Free.

Does it work with big numbers?: Yes. The conversion uses arbitrary-precision math, so numbers with hundreds of digits convert without rounding errors.
Can I paste numbers with a prefix, like 0x1F or 0b1010?: Yes. The 0x, 0b and 0o prefixes are accepted in the hexadecimal, binary and octal fields. Spaces between digits are ignored too.