IconVault's Bitwise Calculator performs AND, OR, XOR, NOT and bit shifts on 32-bit operands and shows every result in binary, octal, decimal and hex at once. Type each operand in whatever base you have, binary, octal, decimal or hex, and the calculator handles the conversion, including both unsigned and signed decimal results and a full 32-bit binary word grouped in nibbles.

Everything is free and runs fully in your browser, which makes it handy for embedded programming, flag math, bitmask design and interview prep. No sign-up, no uploads: just numbers in and answers out.