Text Case Converter

A case converter is a tool that transforms text from one capitalization format to another without retyping. Writers use it to fix accidental Caps Lock, format headings in Title Case, or apply Sentence case to paragraphs. Developers convert variable names between camelCase, snake_case, PascalCase and kebab-case when switching between languages or frameworks. SEO professionals generate URL slugs from article titles. Content creators use Toggle or Alternate case for visual impact on social media.

These are naming conventions used in programming:

• camelCase — first word lowercase, subsequent words capitalized, no spaces. Used in JavaScript, Java, Swift variables.
• PascalCase — every word capitalized, no spaces. Used in C#, Python classes, React components.
• snake_case — all lowercase, words separated by underscores. Used in Python variables, SQL columns, file names.
• kebab-case — all lowercase, words separated by hyphens. Used in CSS classes, HTML attributes, URL slugs.
• SCREAMING_SNAKE_CASE — all uppercase with underscores. Used for constants in most languages.

Title Case capitalizes the first letter of every word: The Quick Brown Fox. It is used for article headings, book titles, and H1 tags. Sentence case only capitalizes the first letter of the first word and any proper nouns: The quick brown fox. It is used for regular text, subheadings, and conversational writing. AP, APA, and MLA style guides differ slightly on which small words (and, of, the, a) to capitalize in titles — this tool uses the general "capitalize all" approach suitable for visual headings.

A URL slug is the part of a URL that identifies a specific page in a readable format, e.g. /how-to-convert-text-case. Good slugs are lowercase, use hyphens (not underscores or spaces), remove stop words, and contain the main keyword. Search engines use slugs as a ranking signal. This tool converts any heading or title into a clean, SEO-friendly slug automatically.

Toggle Case inverts the case of each character — uppercase becomes lowercase and vice versa: Hello World → hELLO wORLD. It is useful for fixing text accidentally typed with Caps Lock on. Alternate Case alternates between uppercase and lowercase every character: Hello → hElLo. It creates a distinctive visual style popular in memes and social media (sometimes called "Mocking SpongeBob" case).

ROT13 (Rotate by 13) substitutes each letter with the letter 13 positions after it in the alphabet. A→N, B→O, etc. It is a simple, reversible cipher — applying it twice returns the original text. It is not encryption, but it is used to hide spoilers in forums, obscure puzzle answers, and encode mildly sensitive content. For example: Hello → Uryyb.

Yes — completely free, no signup, no account. All processing happens in your browser using JavaScript. Your text is never sent to any server. This makes it safe to use with confidential documents, code, or sensitive content. It works offline once the page is loaded.