Number Base Converter
Convert between binary, octal, decimal, and hex. Free, no signup.
How It Works
Enter a number, select its base, and click Convert. The number is displayed in all four bases: binary, octal, decimal, and hexadecimal. Click any result to copy it.
What Are Number Bases?
Number bases (or radixes) define how many digits a numbering system uses. Decimal uses 0-9, binary uses 0-1, octal uses 0-7, and hexadecimal uses 0-9 and A-F. Binary is used in computing, hex is common in colors and memory addresses, and octal appears in Unix file permissions.