Converts numbers between the four most common numeral bases simultaneously: binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16). All four representations update in real time as you type. Also supports custom base conversion (base 2–36).
Enter any number in any base and see all other representations update instantly. For converting colour values between hex and RGB/HSL, the dedicated Hex ↔ RGB ↔ HSL Converter is more focused.
Decimal 255
Input
255 (decimal)
Output
Binary: 11111111 | Octal: 377 | Hex: FF
Convert colour values between Hex, RGB, HSL, and HSB formats.
Encode text to hexadecimal or decode hex back to text.
Convert between Arabic and Roman numerals.
Convert between bytes, KB, MB, GB, TB and calculate string byte sizes.
Convert Markdown to HTML instantly.
Convert HTML markup to clean Markdown syntax.