Title Case capitalizes the important words and leaves short ones like "a", "of", and "the" in lowercase, the way most headlines are written. Words that already mix capitals, like iPhone or NASA, are left alone.

Sentence case capitalizes only the first word of each sentence. It reads more naturally and is what most websites now use for headings and buttons. It keeps acronyms like NASA as they are, unless everything was typed in capitals.

camelCase and PascalCase are common for names in JavaScript, Java, and C#. snake_case is typical in Python and databases, kebab-case in web addresses and CSS, and CONSTANT_CASE for settings that never change. Each line is converted separately. Everything runs in your browser.