Case Converter

The Case Converter transforms the capitalization of any text between common casing styles including UPPERCASE, lowercase, Title Case, Sentence case, and often programmer-friendly forms like camelCase, snake_case, and kebab-case. You paste or type your text, choose a target style, and the tool rewrites every character's case according to the rules of that style while preserving your words and structure. It removes the tedium of manually shifting capitalization across long passages, code identifiers, headings, or imported data.

Each casing mode follows distinct rules: UPPERCASE capitalizes every letter, lowercase makes everything small, Title Case capitalizes the first letter of each significant word, and Sentence case capitalizes only the first letter of each sentence. Programming styles go further by also handling word boundaries — camelCase joins words and capitalizes each after the first, snake_case inserts underscores between lowercased words, and kebab-case uses hyphens, which is the convention for URL slugs and CSS class names. The tool detects existing word boundaries from spaces, punctuation, or existing case transitions to split text into words before reassembling it.

Typical use cases include normalizing inconsistent spreadsheet or CSV data, formatting headlines and titles for articles and SEO metadata, fixing accidental caps-lock typing, and converting variable or function names when refactoring code between language conventions. Writers use Title Case and Sentence case for content polish, while developers lean on camelCase, snake_case, and kebab-case conversions to keep identifiers consistent. For deeper text manipulation you might pair it with the Word Count Calculator or Text Sorter.

A practical tip is to be aware that Title Case rules differ across style guides — some lowercase short prepositions and articles like 'of' and 'the', while others capitalize every word. Check the converted output against your house style. Also note that converting to UPPERCASE then back to Title Case can lose intended capitalization of acronyms or proper nouns, so keep an original copy when working with names, brands, or technical terms that have specific casing.