Paste your text and convert it to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, kebab-case and 8 more styles. Every conversion shows a live preview — click any card to copy. Free, unlimited and 100% private: your text never leaves your browser.
All 15 conversions update live as you type. Clicking a card converts the full text and copies it to your clipboard.
Fifteen converters cover writing, editing and programming. Here is what each one does and when to reach for it.
lowercase converts every letter to its small form — the quickest way to normalize text typed with Caps Lock on, or to prepare strings for case-insensitive comparison. UPPERCASE does the opposite, turning every letter into a capital for headlines, acronyms, legal notices and anywhere emphasis is needed. Both handle accented characters (é, ü, ñ) correctly.
Title Case capitalizes the principal words while keeping short connectors — a, an, the, and, but, or, for, nor, on, at, to, from, by, in, of and friends — in lowercase, following AP-style headline conventions. The first and last words are always capitalized, and so is the first word after a colon. Perfect for article headlines, book titles, YouTube titles and email subject lines.
Sentence case lowercases everything, then capitalizes only the first letter of each sentence (after a period, question mark or exclamation mark, and at line starts). It is the fastest way to turn ALL-CAPS blocks or Title Case headings back into ordinary readable sentences, and it is the capitalization style most style guides recommend for UI labels and buttons.
camelCase joins words without separators, lowercasing the first word and capitalizing the rest: 'user profile settings' becomes userProfileSettings. It is the standard for variables and functions in JavaScript, Java and TypeScript. PascalCase capitalizes the first word too (UserProfileSettings) and is the convention for classes, React components and type names. The converter understands existing camel, snake, kebab and space-separated input, so you can translate between conventions in one click.
snake_case joins lowercase words with underscores (user_profile_settings) — the house style of Python, Ruby, Rust and most database columns. kebab-case joins them with hyphens (user-profile-settings) and is the natural choice for URL slugs, CSS class names and file names, since search engines read hyphens as word separators.
CONSTANT_CASE is all caps joined by underscores (MAX_RETRY_COUNT) — how constants are declared in nearly every programming language. dot.case joins lowercase words with periods, common in configuration keys and namespaced identifiers (user.profile.settings). path/case joins them with forward slashes, matching URL paths and directory-style identifiers (user/profile/settings).
aLtErNaTiNg cAsE flips every other letter to capitals — the instantly recognizable mocking meme format. iNVERSE cASE swaps each letter's case, which rescues text typed with Caps Lock accidentally on: hELLO becomes Hello. lOWER fIRST lowercases the first letter of each word and capitalizes the rest, a small stylistic twist for social posts.
Typed a whole paragraph with Caps Lock on? Don't retype it. Paste it here and use iNVERSE cASE — every capital becomes lowercase and vice versa, instantly restoring normal text. Sentence case then polishes it further.
Headline style guides agree: capitalize nouns, verbs, adjectives and adverbs, but keep short articles (a, an, the), conjunctions (and, but, or) and prepositions (in, on, at, to, for, of) lowercase — unless they come first or last. This converter applies those rules automatically, including the first word after a colon.
Preparing a list of variable names, URL slugs or headings? Turn on 'Convert each line separately' and every line is transformed on its own — paste fifty phrases, click camelCase once, and copy fifty clean identifiers.
Paste your text into the box above and click the 'lowercase' card — the converted text is copied to your clipboard automatically. The same works in reverse with the 'UPPERCASE' card, and 'iNVERSE cASE' swaps the case of every letter if you typed with Caps Lock on by mistake.
Title Case is the headline style where principal words are capitalized but short connecting words — a, an, the, and, but, or, nor, for, on, at, to, from, by, in, of — stay lowercase. The first and last words of the title are always capitalized, as is the first word after a colon. Example: 'The Lord of the Rings: The Fellowship of the Ring'.
They are the four most common naming conventions in programming. camelCase (userName) is used for variables and functions in JavaScript and Java. PascalCase (UserName) names classes and components. snake_case (user_name) is standard in Python, Ruby and SQL. kebab-case (user-name) appears in URLs, CSS classes and file names. This tool converts between all of them — it detects word boundaries from spaces, underscores, hyphens and existing camelCase.
No. All conversions run 100% locally in your browser using JavaScript — your text is never sent over the network, stored, or logged anywhere. You can even disconnect from the internet after the page loads and every converter will keep working.
Yes. Enable the 'Convert each line separately' toggle and the chosen conversion is applied to every line independently — ideal for batch-converting lists of headings, variable names or slugs. Word, character, sentence and line counts update live under the input box.
Yes — completely free, with no sign-up, no limits and no watermarks. The site is funded by unobtrusive advertising, and the tool works on any device with a modern browser, including phones and tablets.