Number base converter
Convert an integer between binary, octal, decimal and hexadecimal.
🔒 100% client-side — no data sent
Convert an integer between binary, octal, decimal and hexadecimal instantly. Handy for programming, electronics, web colors or network masks, the tool shows all four bases at once. Conversion happens 100% in your browser, with no data sent anywhere.
FAQ
How do I convert a decimal number to binary?
Just type your number into the decimal field: the tool automatically shows its binary, octal and hexadecimal equivalents. For example, 10 in decimal becomes 1010 in binary.
What do the 0x, 0o and 0b prefixes mean?
These prefixes indicate a number's base: 0x for hexadecimal (base 16), 0o for octal (base 8) and 0b for binary (base 2). They are commonly used in programming languages.
Why is hexadecimal used in computing?
Hexadecimal compactly represents binary values (4 bits per digit), which makes memory addresses, web colors (#FF0000) and raw data easier to read.
Does the tool handle large numbers?
Yes, it converts common integers without issue. For very large values, precision depends on the limits of the browser's JavaScript engine.