Number Base Converter

Convert an integer between binary, octal, decimal and hexadecimal, plus any custom base from 2 to 36, all at once. Conversion uses JavaScript BigInt, so it stays exact even for numbers far beyond 64 bits — useful for hashes, bitmasks and large IDs.

You can paste values with 0x, 0o or 0b prefixes (when they match the chosen base), and underscores or spaces as separators. Pure arithmetic, entirely in your browser.