Convert text between Chicago-inspired Title Case, AP-inspired Title Case, Sentence case, UPPERCASE, lowercase, Capitalize Every Word, Spanish RAE title capitalization, and developer identifier cases (camelCase, PascalCase, snake_case, kebab-case).
| Mode | Converted Preview |
|---|---|
| Title Case (Chicago-Inspired Heuristic) | Walking through the Forest with a NASA Scientist: A State-of-the-Art Guide between the Trees |
| Title Case (AP-Inspired Heuristic) | Walking Through the Forest With a NASA Scientist: A State-of-the-Art Guide Between the Trees |
| Sentence case | Walking through the forest with a NASA scientist: a state-of-the-art guide between the trees |
| UPPERCASE | WALKING THROUGH THE FOREST WITH A NASA SCIENTIST: A STATE-OF-THE-ART GUIDE BETWEEN THE TREES |
| lowercase | walking through the forest with a nasa scientist: a state-of-the-art guide between the trees |
| Capitalize Every Word (Start Case) | Walking Through The Forest With A NASA Scientist: A State-Of-The-Art Guide Between The Trees |
| Spanish Title / Sentence Case (RAE § 4.17) | Walking through the forest with a NASA scientist: a state-of-the-art guide between the trees |
| camelCase | walkingThroughTheForestWithANasaScientistAStateOfTheArtGuideBetweenTheTrees |
| PascalCase | WalkingThroughTheForestWithANasaScientistAStateOfTheArtGuideBetweenTheTrees |
| snake_case | walking_through_the_forest_with_a_nasa_scientist_a_state_of_the_art_guide_between_the_trees |
| kebab-case | walking-through-the-forest-with-a-nasa-scientist-a-state-of-the-art-guide-between-the-trees |
Title capitalization rules depend on your editorial style guide: Chicago-inspired Title Case lowercases all prepositions regardless of length (such as 'into', 'with', 'between', and 'through'), whereas AP-inspired Title Case lowercases only prepositions of 3 letters or fewer and capitalizes words of 4 or more letters ('Into', 'With', 'Between', 'Through').
PeekAndDo separates editorial and developer transformations into 11 explicit modes. In both Chicago-inspired and AP-inspired Title Case, the first and last words of the title and the first word after a colon (:), em dash (—), or end punctuation are always capitalized, and articles ('a', 'an', 'the') and short coordinating conjunctions ('and', 'but', 'for', 'nor', 'or', 'so', 'yet') are lowercased. Chicago-inspired mode lowercases all prepositions in its stopword set, while AP-inspired mode capitalizes prepositions with 4 or more letters. Developer modes tokenize camelCase, PascalCase, spaces, underscores, and hyphens into clean identifier tokens.
Input headline: 'walking through the forest with a friend between the trees'
Chicago-Inspired: 'Walking through the Forest with a Friend between the Trees' | AP-Inspired: 'Walking Through the Forest With a Friend Between the Trees'.
Input phrase: 'annual gross salary converter'
camelCase: 'annualGrossSalaryConverter' | PascalCase: 'AnnualGrossSalaryConverter' | snake_case: 'annual_gross_salary_converter' | kebab-case: 'annual-gross-salary-converter'.
Both styles capitalize the first and last words of a title and lowercase articles ('a', 'an', 'the') and short coordinating conjunctions. The primary difference is how they treat prepositions of 4 or more letters: Chicago style lowercases all prepositions regardless of length (such as 'with', 'from', 'into', 'between', 'through', and 'without'), whereas AP style capitalizes words of 4 or more letters ('With', 'From', 'Into', 'Between', 'Through', 'Without').
Capitalize Every Word (also called Start Case) capitalizes the first letter of every single word—including 'A', 'An', 'The', 'In', 'Of', and 'And'—whereas Title Case keeps minor articles, conjunctions, and prepositions lowercase unless they appear at the beginning or end of the title.
According to the Real Academia Española (Ortografía de la lengua española, § 4.17), titles of books, articles, movies, and headlines in Spanish follow sentence-style capitalization: only the very first word of the title and any proper nouns are capitalized (for example, 'Cien años de soledad'). Applying English Title Case to Spanish text is considered an orthographic Anglicism.
No. Every case transformation runs entirely inside your browser's memory using pure JavaScript. Your text is never transmitted over the network and is never saved to localStorage, sessionStorage, or cookies.