Convert any text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case and more — every style shown at once, instantly. Runs entirely in your browser — your numbers never leave this device.
| Style | “the quick brown fox” becomes |
|---|---|
| UPPERCASE | THE QUICK BROWN FOX |
| lowercase | the quick brown fox |
| Title Case | The Quick Brown Fox |
| Sentence case | The quick brown fox |
| camelCase | theQuickBrownFox |
| PascalCase | TheQuickBrownFox |
| snake_case | the_quick_brown_fox |
| kebab-case | the-quick-brown-fox |
| CONSTANT_CASE | THE_QUICK_BROWN_FOX |
| aLtErNaTiNg | tHe QuIcK bRoWn FoX |
| iNVERSE | THE QUICK BROWN FOX |
Paste your text once and all eleven styles are produced at the same time, so you can copy the one you need instead of converting repeatedly. The identifier styles — camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE — are built from word tokens: the text is first split wherever a non-alphanumeric character appears and wherever a lowercase letter or digit meets an uppercase letter, which is why “UserFirstName” tokenises back into user / first / name before being rejoined as user_first_name.
The prose styles work differently. Title Case capitalises the first letter of every word, including small words like “of” and “the” — this tool applies the simple mechanical rule rather than a publisher's style guide, which would leave some small words lowercase. Sentence case lowercases everything, then capitalises the first letter of the text and the first letter after each . ! or ?. UPPERCASE and lowercase transform the text as-is, preserving your spacing and punctuation exactly.
Two styles are toys with real uses: alternating case cycles lower/upper over letters only (spaces and punctuation do not advance the cycle), and inverse case flips every letter's case — on already-lowercase text that simply gives uppercase, so try it on mixed-case input. Everything runs in your browser; your text is never uploaded or stored.
This converter applies the simple mechanical rule — every word is capitalised — because it has no way to know which style guide you follow. Editorial title case (Chicago, AP) leaves short prepositions and articles lowercase unless they start the title. If you need that, lowercase those small words by hand after converting; “A Tale Of Two Cities” from this tool becomes “A Tale of Two Cities” with two small edits.
Only the first letter. camelCase starts lowercase (userFirstName) and is the convention for variables and methods in JavaScript, Java and C#. PascalCase starts uppercase (UserFirstName) and is the convention for class and type names in the same languages. Both are built from the same word tokens.
snake_case (user_first_name) is the convention for variables and database columns in Python, Ruby and SQL. CONSTANT_CASE (MAX_RETRY_COUNT) is the near-universal convention for constants and environment variables across languages. kebab-case (my-blog-post) is used for URLs, CSS class names and file names, because underscores can be hard to see in underlined links.
UPPERCASE, lowercase, Title Case, Sentence case, alternating and inverse preserve your line breaks, spacing and punctuation. The five identifier styles rebuild the text from word tokens, so punctuation and repeated spaces are removed by design — a heading becomes a single identifier with no spaces.
No. All eleven conversions happen in your browser on your own device. Nothing is uploaded, stored or tracked.
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