Converts text to lowercase, UPPERCASE, Sentence case, Title Case, tOGGLE cASE or aLtErNaTiNg cAsE, and to twelve code cases under More cases. The code cases find the words inside an earlier camelCase name too, so snake_case turns bestFreeCaseConverter into best_free_case_converter. Each line converts on its own, so a column of names stays a column.
Past the everyday cases, the list turns into naming conventions: camelCase for JavaScript variables, snake_case for Python and SQL columns, kebab-case for URLs and CSS classes, PascalCase for class names, UPPER_SNAKE_CASE for constants and environment variables, Header-Case for HTTP headers.
Renaming a batch of files or database columns is where these earn their place. The rule is mechanical, the same conversion applies to every line, and doing it by hand is where the typos come from. Spaces, hyphens, underscores, dots and the capitals inside a name all count as word breaks, so any of them converts to any other.
A paragraph typed with caps lock on does not become readable by lowercasing it: you lose the sentence starts and every proper noun with them. Sentence case handles the first half by capitalizing the first letter of each line and the first letter after each period, question mark and exclamation mark. The names still need a human.
Title Case here capitalizes every word, “Of” and “The” included: “The Lord Of The Rings”. For a headline that follows Chicago, APA or AP, use the Title Case Converter.
Paste your text and pick a case. The converted text appears next to it and follows every change you make, so you can try a few cases on the same text before you copy. The case you pick is remembered for your next visit.
Every word starts with a capital and nothing separates them: MyVariableName, CalculateTotalPrice. It's camelCase with the first letter capitalized too, which is why it's also called UpperCamelCase. You see it on class names in Java, C# and Python, on React components and on TypeScript types.
Capitals with underscores between the words: MAX_FILE_SIZE, API_BASE_URL. It's how most languages write constants and how nearly everyone writes environment variables. Here it's the UPPER_SNAKE_CASE button; CONSTANT_CASE is a third name for the same thing.
Lowercase words joined by periods: user.profile.settings. You meet it in Java package names (com.example.myapp), in configuration keys and in translation files, where the dots mirror a nested structure.
Lowercase for URLs, email addresses, hashtags and most code names. UPPERCASE for constants, acronyms and the odd word you really need to stress. A whole message in capitals reads as shouting, so for anything longer than a heading, Sentence case is the safer pick.
Sentence case capitalizes the first letter of each sentence and lowercases the rest.
Lowercase words joined by forward slashes: user/profile/settings. It's kebab-case with slashes, and it turns a phrase into something shaped like a URL path or a folder path, which is mostly what it's for.
Each word capitalized and joined by hyphens: Content-Type, Accept-Language, X-Request-Id. It's the shape of HTTP header names, which is why the button here is called Header-Case. The train is the words hooked together like carriages.
Turn text typed with caps lock on back into normal sentences.
Lowercase and uppercase letter by letter: aLtErNaTiNg cAsE. It's the Mocking SpongeBob meme in text form, the way to quote someone back at them with a sneer. Nobody uses it for anything serious, and that's the point.
Every letter flips: "Hello World" becomes "hELLO wORLD". Paste a sentence typed with caps lock on, "tHIS IS mY NAME", and toggle case turns it straight back into "This is My name". Unlike alternating case, it keeps the pattern of the original and just inverts it.