Binary/Hex/Decimal Converter

The Binary/Hex/Decimal Converter translates numbers between binary, octal, decimal and hexadecimal simultaneously — type once, read all four bases. It accepts standard prefixes (0b, 0o, 0x) and underscore separators, and copies any result with one click.

Because it's built on BigInt, it converts arbitrarily large integers exactly — no precision loss at 2⁵³ like ordinary JavaScript numbers. That makes it reliable for memory addresses, file permissions, color values, bitmasks and network math.

Invalid digits for the selected base are flagged immediately, so typos never produce silently wrong conversions.