How to Convert Text Case Correctly

The case styles explained

The converter supports the styles you meet in everyday writing and in code:

• UPPERCASE — every letter capitalised. Use for emphasis, acronyms, and short labels; avoid for long passages, which become hard to read.
• lowercase — every letter lowercased. Use for casual messaging and code identifiers.
• Title Case — the first letter of every word capitalised. Use for headlines, book and song titles, and section headings.
• Sentence case — only the first letter of each sentence capitalised, plus proper nouns. Use for body text and most prose.
• tOGGLE cASE — flips the case of every letter. Use to rescue text typed with Caps Lock on.

Programming case styles

Code uses its own conventions, and the converter handles them too:

• camelCase — first word lowercase, subsequent words capitalised, no separators: "myVariableName". Standard for JavaScript variables and functions.
• PascalCase — every word capitalised, no separators: "MyClassName". Standard for classes and type names.
• snake_case — words lowercase, separated by underscores: "my_variable_name". Standard for Python and for constants in many languages.
• kebab-case — words lowercase, separated by hyphens: "my-variable-name". Standard for CSS classes, URLs, and file names.

When to use each style

Match the style to the context. Headings and titles want Title Case; body copy wants Sentence case; code identifiers want the convention of your language. Mixing styles — Title Case body text, or camelCase in a Python file — signals carelessness to readers and reviewers. When in doubt, follow the convention of the surrounding text or the style guide of your project.

Common mistakes

A few pitfalls to watch for:

• Title Case is not always right for headings. Some style guides (notably APA for long prepositions) keep short words lowercase. Check your guide before applying Title Case blindly.
• Capitalising after a hyphen is usually wrong. "Well-Being" is correct in some guides; "Well-being" in others. Know your house style.
• camelCase and snake_case are not interchangeable. Converting between them changes meaning in code reviews and can break references — convert deliberately, not casually.
• Proper nouns must stay capitalised even in lowercase styles. A naive lowercase pass turns "iPhone" into "iphone"; fix these by hand after converting.