Case Converter

A case converter is an online tool that transforms text between different letter-case formats — uppercase, lowercase, title case, sentence case, camelCase, and more — instantly, without retyping. You paste your text, choose a style, and copy the result. Case converters save time when correcting accidental Caps Lock text, formatting headlines, or converting variable names between programming conventions.

Title case capitalizes the first letter of most words (excluding short articles and prepositions), producing "The Art of War." Sentence case capitalizes only the first word of each sentence and proper nouns, producing "The art of war." Title case is traditional for book titles and formal headings; sentence case is preferred by AP Style, BBC, and modern UI design guidelines for its more natural, conversational appearance.

Paste your text into the case converter above and click the "UPPER CASE" button. The tool instantly transforms every letter to its capital form. You can then click "Copy Result" to copy the uppercase text to your clipboard. The conversion happens entirely in your browser — no text is sent to any server.

camelCase is a naming convention that joins multiple words into one, with the first word in lowercase and each subsequent word starting with a capital letter — for example, "backgroundColor" or "userProfileData." Use camelCase for JavaScript variables, functions, and object properties. Java, Swift, Kotlin, and TypeScript also use camelCase for method names and local variables.

The only difference is the first letter. camelCase starts with a lowercase letter (myVariable), while PascalCase starts with an uppercase letter (MyVariable). camelCase is used for function and variable names; PascalCase is used for class names, React components, TypeScript interfaces, and constructor functions. Both join multiple words without spaces or separators.

snake_case is a naming convention where all words are lowercase and separated by underscores — for example, "user_profile_data." It is the dominant convention in Python (for variables, functions, and modules), database column names, JSON keys, and REST API field names. A variant called SCREAMING_SNAKE_CASE uses all uppercase letters for constants.

kebab-case uses lowercase words separated by hyphens — for example, "user-profile-data." It is the standard format for URL slugs because Google treats hyphens (not underscores) as word separators, making kebab-case the most SEO-friendly option for page URLs. It is also used for CSS property names (background-color, font-size), Angular component selectors, Vue file names, and npm package names.

Our sentence case converter preserves the capitalization of known proper nouns and acronyms — including names like NASA, iPhone, SQL, JavaScript, and most country and city names — while converting all other letters to lowercase. It also capitalizes the first word of every sentence. A built-in dictionary of approximately 500 terms ensures common proper nouns are not incorrectly lowercased.

Yes. The case converter handles large text pastes (up to 50,000 characters) entirely in your browser using JavaScript string operations. There is no server upload, no file size limit enforced remotely, and no risk of your text being stored or read. For very large documents, the tool may take a moment but will not crash or fail.

The title case converter supports four major style guides: AP Style (Associated Press), APA Style (American Psychological Association), Chicago Manual of Style, and MLA Style (Modern Language Association). Each guide has slightly different rules about which prepositions, conjunctions, and articles to capitalize. A default "general title case" option is also available for everyday use.

No. The case converter works entirely client-side in your browser. Your text is processed by JavaScript string APIs and is never sent to a server, stored in a database, or transmitted over the internet. The only data saved locally is your preferences (like your last-used case style and dark mode setting), which are stored in your browser's localStorage.

Alternating case switches each character between uppercase and lowercase in sequence — producing patterns like "hElLo WoRlD." It is widely used in memes, gaming usernames, social media aesthetics, and as the "sarcasm font" in internet culture. It has no formal writing application but is a popular creative text effect. Our converter starts with lowercase for the first letter by default.