Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal with BigInt support for arbitrarily large values.
Privacy: This tool runs entirely in your browser. Your data never leaves your device and is never uploaded to any server.
Binary (base 2)
11111111
Octal (base 8)
377
Decimal (base 10)
255
Hexadecimal (base 16)
ff
Frequently asked questions
Which number bases are supported?
Binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16).
Does it support large numbers?
Yes. Conversions use JavaScript BigInt, so numbers far beyond the normal 64-bit integer range work correctly.
Can I convert negative numbers?
Yes. Prefix the input with a minus sign to convert negative values.