Case Converter — Convert Text to Uppercase or Lowercase

The converter supports twelve styles: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, aLtErNaTiNg case and iNVERSE case — covering every common style used in writing, documentation and code.

camelCase keeps the first word lowercase and capitalises every subsequent word (myVariableName). PascalCase capitalises every word including the first (MyVariableName). snake_case writes everything lowercase with underscores between words (my_variable_name). Pick the one your language or style guide prefers.

The converter splits the input on whitespace, underscores, hyphens, dots and camelCase boundaries before reassembling it in the chosen style. That means it cleanly rewrites identifiers like "userIDList" or "data-export.v2" without losing any tokens in between.

Yes. Each line is converted independently and the original newlines are kept, so pasting a list of headlines, a code block or a CSV column gives you the same shape back — only the casing of each line changes.

Yes. The tool uses the JavaScript Unicode-aware string methods, so accented Latin letters (café → CAFÉ), Cyrillic, Greek and other scripts are upper/lowercased correctly. Non-cased scripts like Arabic or CJK are left untouched, which is the expected behaviour.

Yes. Conversion and copying run in your browser with no watermark. If you request a file download while signed out, a temporary copy of the finished export preserves it through sign-in and expires automatically.

Paste your text and pick the UPPERCASE style — every letter becomes a capital. Use lowercase to go the other way, or aLtErNaTiNg case for mixed caps. Handy for headings, acronyms, spreadsheet headers and shouting-free emphasis you want to undo later.

Choose Title Case and the converter capitalizes the first letter of every word, which suits product names, column headers and short labels. For only the first word of each line — the style used for body copy and buttons — pick Sentence case instead.

Both capitalize most words in a heading, but they follow different style-guide rules for short words: Chicago/MLA capitalization is tuned for academic titles and manuscripts, while AP/APA follows the newsroom convention journalists use for headlines. Pick Chicago/MLA for papers, book titles and citations, and AP/APA when you need a headline that matches AP Stylebook formatting.

aLtErNaTiNg case flips every other letter and is mostly used for the mocking 'SpongeBob meme' text style on social media. iNVERSE case instead flips whatever capitalization is already there, which is a quick fix for text typed with Caps Lock accidentally left on.

It depends on the language's convention: camelCase for JavaScript/TypeScript variables and functions, PascalCase for React component names and C#/Java classes, snake_case for Python variables and most Postgres/MySQL column names, and CONSTANT_CASE for constants and environment variables in almost any language. Paste an identifier once and click through the modes to instantly see it in whichever style your codebase's linter expects.

dot.case joins words with periods instead of spaces or underscores (my.config.key), matching the format used by Java and Spring properties files, nested configuration keys, npm package namespaces, and some i18n translation-key files. It's a narrower use case than snake_case or kebab-case, but it's the exact format those config formats expect.

Paste your text and choose lowercase — every letter is converted instantly, the fastest way to change upper case to lower case without retyping. Pick Sentence case instead if you want the first letter of each sentence kept capitalized, or Title Case if the text is a headline.

Paste the all-caps text and select Sentence case — it lowercases everything and re-capitalizes the first letter of each sentence, which usually restores normal writing in one click. Choose lowercase if you want no capitals at all, or inverse case to flip the current case of every letter.

No — Case Converter runs entirely in your browser, so what you paste never leaves the machine you are on. That matters if you are checking something that contains a token, a key or customer data. Closing the tab is enough to clear it.

Pasting into a plain-text field drops bold, italics and styles by design — only the characters survive. That is usually what you want here, since the point is to work on the text itself. Keep the styled original open in its own app and reapply the formatting after you paste the processed text back.

Case Converter supports free standard use within the published processing allowances. Free downloads are clean — no watermark. No signup is required for standard tool use. Photo effects and AI edits have a web-size limit on Free, with the original-resolution result available through Premium or one credit. Crop, resize, rotate, compress and convert stay full size. Published processing allowances and file limits still apply.

No — Case Converter runs in the browser on desktop and phone. There is nothing to install, no trial to start, and no license to buy before you can see whether it does what you need. Try it on the file you are actually stuck with rather than a sample.