Number Base Converter

They’re number systems with 2, 8, 10 and 16 symbols respectively. Decimal is everyday counting; binary is how computers store data; hexadecimal is a compact way to write binary (one hex digit = four bits); octal groups bits in threes and appears in file permissions.

One hex digit maps exactly to four binary bits, so a byte is just two hex digits. That makes hex a compact, readable stand-in for long binary strings — which is why colours, memory addresses and hashes are written in it.

Yes. It uses arbitrary-precision integers (BigInt), so values well beyond the usual 2⁵³ JavaScript limit — long hashes, 128-bit numbers — convert exactly with no rounding.

Binary allows 0–1, octal 0–7, decimal 0–9, and hex 0–9 plus A–F. If you enter a digit outside the chosen base — like 9 in binary — the tool reports invalid input instead of guessing.

No. You can type hexadecimal in upper or lower case (ff or FF); both parse the same. Results are shown in uppercase, the common convention for hex.

No — it handles non-negative whole numbers, where base conversion is unambiguous. Negative numbers involve representation choices (like two’s complement) and fractions need a radix point, both beyond this tool’s scope.

Long binary and hex values are often written in groups (1111 0000) for readability. The tool strips whitespace before parsing, so grouped input works without you having to remove the spaces.

Yes. The conversion runs entirely in your browser; nothing is uploaded and analytics never receives your input.