About binary and octal

Binary is base 2 — every digit is a bit, 0 or 1. It's what hardware actually stores, and it surfaces anywhere bit flags, masks, or permissions do. Code usually writes it with a 0b prefix.

Octal is base 8, using digits 0–7. Each octal digit maps to exactly three bits, which is why Unix file permissions like 755 are octal. Code writes it with a 0o prefix.

For example, binary 11010110 is 326 in octal. The converter uses BigInt, so numbers of any size convert without losing precision — and it all runs in your browser.