Case Converter

How to Use the Case Converter

The Case Converter transforms your text between different capitalization styles with a single click. Whether you accidentally typed in caps lock, need to format headings properly, or want to convert code variable names, this tool handles every text case transformation quickly and accurately.

Available Conversions

UPPERCASE: Converts all letters to capitals. "hello world" becomes "HELLO WORLD." Used for acronyms, headings, and emphasis in certain contexts.

lowercase: Converts all letters to small letters. "HELLO WORLD" becomes "hello world." Useful for normalizing data, email addresses, and URLs.

Title Case: Capitalizes the first letter of each word. "the quick brown fox" becomes "The Quick Brown Fox." Some styles lowercase articles and prepositions (a, an, the, of, in).

Sentence case: Capitalizes only the first letter of each sentence. "hello there. how are you?" becomes "Hello there. How are you?"

camelCase: Removes spaces and capitalizes each word except the first. "user first name" becomes "userFirstName." Standard in JavaScript and Java programming.

snake_case: Replaces spaces with underscores and lowercases everything. "User First Name" becomes "user_first_name." Common in Python and databases.

How to Use

Paste or type your text in the input area, then click the button for the desired case. The converted text appears in the output area, ready to copy. You can chain conversions, applying multiple transformations sequentially.

Naming Conventions by Language

Different programming languages and frameworks have established conventions for variable, function, and class naming. Understanding which case to use in each context prevents style inconsistencies and makes your code easier for other developers to read.

JavaScript / TypeScript: Use camelCase for variables and functions (getUserName, totalPrice), PascalCase for classes and components (UserProfile, HttpClient), and CONSTANT_CASE for constants (MAX_RETRIES, API_BASE_URL).

Python: Use snake_case for variables, functions, and module names (get_user_name, total_price). Classes use PascalCase (UserProfile), and constants use CONSTANT_CASE (MAX_RETRIES).

CSS / HTML: Use kebab-case for class names, IDs, and custom attributes (main-content, nav-link, data-user-id). This convention matches the hyphenated style of CSS properties themselves (background-color, font-size).

Ruby: Similar to Python with snake_case for methods and variables, PascalCase for classes and modules, and SCREAMING_SNAKE_CASE for constants.

Go: Uses camelCase for private (unexported) identifiers and PascalCase for public (exported) identifiers. The capitalization of the first letter determines visibility, making case conventions a core part of the language.

When to Use Each Case

Beyond programming, case conventions appear throughout digital content. Title Case is standard for book titles, article headings, and UI labels. Sentence case is increasingly preferred for subheadings and button text in modern interface design because it feels more natural and conversational. UPPERCASE is used sparingly — for acronyms, legal disclaimers, or short labels — since full uppercase text is harder to read in long passages. When working with database column names, snake_case is the most portable choice because it avoids issues with case-sensitive systems.

Frequently Asked Questions

Q: Does the converter handle special characters and accented letters?

A: Yes. The converter correctly handles accented characters (e, n, u), special characters, and Unicode text. Numbers and symbols remain unchanged. Only alphabetic characters are affected by case conversion.

Q: What title case rules does the converter follow?

A: The converter offers two title case options: simple (capitalize every word) and AP/Chicago style (lowercase articles, short prepositions, and conjunctions unless they start the title). Choose the style appropriate for your context.

Q: Can I convert case in bulk?

A: Yes. There is no practical character limit. Paste entire documents, spreadsheet columns, or database exports. The converter processes text of any length instantly and preserves line breaks, tabs, and other whitespace formatting.

Q: What is the difference between camelCase and PascalCase?

A: Both conventions remove spaces and capitalize word boundaries. The difference is the first letter: camelCase starts with a lowercase letter (myVariableName), while PascalCase starts with an uppercase letter (MyClassName). In most languages, camelCase is used for variables and functions, and PascalCase is reserved for classes, types, and constructors.