IconVault's Base Converter converts numbers between binary, octal, decimal and hexadecimal instantly, using BigInt so even very large values convert exactly. Type in any base and see all four representations at once, explore the value with a clickable bit visualizer at any bit width, and switch on two's complement mode to see how signed integers are stored.

Everything runs fully in your browser with no signup, and it is free to use. It is a learning and debugging aid for programmers, students and electronics hobbyists, not a calculator for financial or cryptographic work, so always double check results that feed into real systems.