The Number Base Converter translates whole numbers between binary, octal, decimal and hexadecimal. Choose the base of your input, type the value, and see it represented in all four bases at once — computed with big-integer precision so large values stay exact.
Binary, octal, decimal and hex
Pick the base your number is written in — binary (base 2), octal (base 8), decimal (base 10) or hexadecimal (base 16) — and the converter instantly shows the equivalent in every other base. Invalid digits for the chosen base are flagged so you never get a wrong answer.
Because it uses arbitrary-precision integers, even very large values convert exactly, making it reliable for programming, networking and digital electronics.
Common base conversions
- Binary to decimal and decimal to binary
- Decimal to hexadecimal and hex to decimal
- Octal conversions for file permissions
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