Case Converter — UPPERCASE, lowercase, Title Case & camelCase, All 12 Results at Once
Free case converter: all 12 results at once — UPPERCASE, lowercase, Title Case, camelCase, snake_case. Click a card to copy. Runs in your browser.
All 12 conversion results
Click any card to copyAbout this tool
Free online case converter that shows every result at once: paste your text and get UPPERCASE, lowercase, Sentence case, Capitalized Case, Title Case, inverse case, aLtErNaTiNg case plus five programmer naming styles — camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE — in a single board. Click any card to copy that result. Everything runs locally in your browser: no sign-up, no upload, works offline.
Most case converters make you click through modes one at a time, and almost none offer programmer naming cases. Here you compare all 12 side by side, with the letters that actually changed highlighted in each card — so you can spot the difference between near-identical modes (Sentence vs Capitalized vs Title) in one glance instead of three round trips.
Three kinds of "capitalized" — pick the right one
"Capitalize the first letter" means at least three different things in English writing, and picking the wrong one is a common reason papers and documents get returned:
| Mode | Rule | Example |
|---|---|---|
| Sentence case | First letter of each sentence capitalized, everything else lowercase | The quick brown fox. It jumps over the lazy dog. |
| Capitalized Case | First letter of every word capitalized | The Quick Brown Fox. It Jumps Over The Lazy Dog. |
| Title Case | Content words capitalized, small words (articles, short prepositions, conjunctions) lowercase — first and last word always capitalized | The Quick Brown Fox Jumps over the Lazy Dog |
- Sentence case is the standard for body paragraphs, news copy and most formal writing.
- Capitalized Case fits names, place names and some book-title styles.
- Title Case is what APA and Chicago style require for paper titles and book titles — the tool ships with a built-in list of 24 common small words and handles first/last words correctly.
Programmer naming cases
Turn any phrase into a variable name — the tokenizer splits on spaces, hyphens, underscores and camelCase boundaries, keeps letters and digits, then rejoins in the target style:
| Style | Result of user login retry count MAX |
|---|---|
| camelCase | userLoginRetryCountMax |
| PascalCase | UserLoginRetryCountMax |
| snake_case | user_login_retry_count_max |
| kebab-case | user-login-retry-count-max |
| CONSTANT_CASE | USER_LOGIN_RETRY_COUNT_MAX |
This is the direction that matters when renaming between languages or fixing a naming convention — no other mainstream case converter offers it in Chinese or English UI alongside the writer's cases.
Which case belongs where
| Mode | Use it for |
|---|---|
| UPPERCASE | acronyms, emphasis, code constants |
| lowercase | fixing caps-lock accidents, URLs |
| Sentence case | body paragraphs, news, formal documents |
| Capitalized Case | names, place names, some titles |
| Title Case | paper and book titles (APA / Chicago) |
| inverse case (sWAP) | fixing shifted casing, playful rewrites |
| aLtErNaTiNg | social media mocking tone |
| camelCase and friends | variables, constants, CSS classes, file names |
Chinese and other non-Latin text
The converter only touches the 26 English letters. Chinese characters, digits, punctuation and all other scripts pass through untouched, so mixed CJK-Latin text is safe. The one exception is the five programmer cases: those extract English words and digits and rejoin them, because a variable name cannot contain spaces or CJK characters anyway.
Related tools: Simplified-Traditional Converter for Chinese variant conversion, Word Counter for mixed-script word and character counts.
FAQ
How do I batch convert case in Excel?
CC_FAQ_A1
How do I cycle through cases in Word?
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Why do words like over and the stay lowercase in Title Case?
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Does the converter change Chinese or other non-Latin characters?
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Does the tool upload my text?
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