How number base conversion works
Every number base uses place values. Decimal uses powers of 10, binary uses powers of 2, octal uses powers of 8, and hexadecimal uses powers of 16. The written symbols change, but the quantity can remain the same.
For programming and computer science, binary and hexadecimal are especially common. Binary shows the exact bit pattern, while hexadecimal compresses each four-bit group into one readable symbol. Decimal is easier for humans to compare, so many workflows involve moving between all three.
When to use these converters
Use the focused converter pages when a single direction matters, such as hex to binary for byte groups or binary to decimal for a classroom place-value example. Use the combined number base converter when you want to enter one whole number and compare several bases at once. The ASCII table is useful when the value represents a character instead of only a numeric quantity.
These tools are intentionally limited to clear, small inputs. That makes them easier to use on mobile and avoids mixing unrelated rules for signed integers, floating point numbers, encodings, and overflow. If you are working inside a programming language, treat the result as the base value first and then apply the language-specific type rules separately.