Number & Programming
Binary, hex, octal, and everyday math.
Binary / Hex / Octal Converter
Convert any number between binary, decimal, octal, and hexadecimal.
Roman Numeral Converter
Convert numbers to Roman numerals, and back again.
Prime Number Checker
Check if a number is prime, or list all primes up to a limit.
Code Formatter
Fix indentation in JavaScript, Python, Java, C-family, PHP, HTML, CSS, JSON, and more.
Calculator
Switch between a normal calculator and a full scientific one.