About decimal and binary

Decimal is base 10 — ordinary numbers. Most code displays values in decimal even when they're stored as bits underneath, so it's usually one side of any base conversion.

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.

For example, decimal 1024 is 10000000000 in binary. The converter uses BigInt, so numbers of any size convert without losing precision — and it all runs in your browser.