Number Base Converter

The Number Base Converter flips integers between binary, octal, decimal, and hexadecimal, which is the core skill behind reading memory, debugging low-level code, and working with color values or bitmasks. Enter a number in any base and see it in the others instantly, and watch the binary representation update as you type. It is a quick reference when you are converting an IP address, a flag value, or a color code, and a teaching aid when you want to see why a power of two is where it is. Computers work in binary, people read in decimal, and developers spend a lot of time somewhere in between, which is why conversion between bases is a skill that keeps coming up. Hexadecimal is the common shorthand because four bits map neatly onto one digit, so a byte is always two hex characters, and octal survives where permissions and older formats use it. Reading a number in all bases at once is the fastest way to answer practical questions: what is this memory address in decimal, which bits are set in this flag value, does this color literal mean what I think it means, and is this permission mask the one I intended. Seeing the binary form explicitly is the part that makes masks and flags click, because you can read off individual bit positions instead of doing arithmetic. Conversion is exact for integers and the representation is positional, so the same value looks different in each base while meaning the same thing. It is a reference tool you keep open while working at the low level of a system rather than something you run once and forget.

📘 Related guide: Convert Roman numerals to numbers and back →