Number Base Converter
Number Base Converter
Different number bases are used across computing and mathematics — binary for how computers store data, hexadecimal for compact byte representations (like color codes), octal in some legacy systems, and decimal for everyday use.
This tool converts between all four directly.
Each base is really just a different way of grouping the same underlying quantity: binary (base 2) is the native representation inside digital hardware, hexadecimal (base 16) packs four binary digits into one readable character and shows up constantly in memory addresses and color codes, and octal (base 8) — while less common today — still appears in certain legacy systems and Unix file permission notation. Rather than converting one specific pair of bases like the dedicated converters on this site, this tool lets you freely switch either dropdown to move directly between any two of the four supported bases in one step.
- Binary (base 2): uses only digits 0-1, the native representation for digital computing.
- Hexadecimal (base 16): uses digits 0-9 and letters A-F, commonly used for memory addresses and color codes (e.g. #FF5733).
- Fully flexible: change either dropdown to convert between any two of the four supported number bases.
How do I convert decimal 255 to hexadecimal?
255 in decimal equals FF in hexadecimal — select "Decimal" as From and "Hexadecimal" as To.
What happens if I enter invalid characters for the selected base?
The calculator shows "Invalid input" — for example, entering "2" while "Binary" is selected as From, since binary only allows 0 and 1.
Number Base Converter
Different number bases are used across computing and mathematics — binary for how computers store data, hexadecimal for compact byte representations (like color codes), octal in some legacy systems, and decimal for everyday use.
This tool converts between all four directly.
Each base is really just a different way of grouping the same underlying quantity: binary (base 2) is the native representation inside digital hardware, hexadecimal (base 16) packs four binary digits into one readable character and shows up constantly in memory addresses and color codes, and octal (base 8) — while less common today — still appears in certain legacy systems and Unix file permission notation. Rather than converting one specific pair of bases like the dedicated converters on this site, this tool lets you freely switch either dropdown to move directly between any two of the four supported bases in one step.
- Binary (base 2): uses only digits 0-1, the native representation for digital computing.
- Hexadecimal (base 16): uses digits 0-9 and letters A-F, commonly used for memory addresses and color codes (e.g. #FF5733).
- Fully flexible: change either dropdown to convert between any two of the four supported number bases.
How do I convert decimal 255 to hexadecimal?
255 in decimal equals FF in hexadecimal — select "Decimal" as From and "Hexadecimal" as To.
What happens if I enter invalid characters for the selected base?
The calculator shows "Invalid input" — for example, entering "2" while "Binary" is selected as From, since binary only allows 0 and 1.