Case Converter: Change text case

Paste your text into the field and click “lowercase”. All text immediately becomes lowercase, while punctuation and line breaks are preserved. To keep the first letter of each sentence capitalized, use “Sentence case” instead. “Undo” restores the previous version.

Click “UPPERCASE”. Umlauts and accented letters are converted too: ä becomes Ä and é becomes É. By default, ß becomes SS (Straße becomes STRASSE); the “Write ß as ẞ” option produces STRAẞE. For Turkish text, the “Turkish i” option turns i into İ.

Click “iNvErTeD”: the converter swaps the case of every letter, turning “hALLO wELT” into “Hallo Welt”. If the entire text is uppercase, use “Sentence case”: it lowercases everything, then capitalizes the first letter of each sentence and line. Capitalize proper names manually afterward.

“Sentence case” capitalizes only the first letter of each sentence and line. Title Case follows English headline rules: the first and last words, and the first word after a colon, are capitalized; articles, short conjunctions and short prepositions stay lowercase. “Capitalize Every Word” capitalizes every word, regardless of its role. For headings in languages that capitalize only the first word, use “Sentence case”.

Both rule sets leave articles, short conjunctions and short prepositions lowercase. Chicago also leaves long prepositions such as over or with lowercase; AP capitalizes words of four or more letters. Under AP, “the fox jumps over the lazy dog” becomes “The Fox Jumps Over the Lazy Dog”; under Chicago, it becomes “The Fox Jumps over the Lazy Dog”. Choose the rules under “Title Case rules”; AP is the default.

Under “Code case style”, click camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE or dot.case. The converter first splits the text into words, even if it already uses another case style: userID becomes user_id, and some_snake_case becomes someSnakeCase. Punctuation is removed, and each line is converted separately, so you can process whole lists of names at once.

Not with “Sentence case”, Title Case or “Capitalize Every Word”: these styles lowercase the text first, so NASA becomes Nasa or nasa. Check abbreviations and proper names after conversion and correct them directly in the text field. You can also undo these edits with “Undo”.

In Word, select the text and press Shift + F3 repeatedly. In Excel, use the UPPER, LOWER and PROPER functions, for example =LOWER(A1). In Google Docs, select Format, Text and Capitalization. For code case styles or several conversions in a row, convert the text here and use “Undo” to switch between versions.

No. Conversion takes place entirely in your browser; your text is neither uploaded nor stored. This also applies to confidential text such as contracts or source code. Copy the finished text or download it as a .txt file.