Case Converter
Convert writing and code identifiers live, with an explicit choice of AP or Chicago Title Case.
- Runs in your browser — files never leave your device
- Fewer clicks, keyboard friendly
How to use
- Paste or type text in the “Text to convert” box.
- Choose a writing case or a developer case; the result updates immediately.
- For a heading, choose Title and then select AP or Chicago.
- Copy the converted text, or use it as the input for another conversion.
AP and Chicago Title Case are not the same
Both styles capitalize the first and last word of a title and leave articles and coordinating conjunctions lowercase in the middle. The practical difference appears with longer prepositions. AP title style capitalizes words of four letters or more, so “Learning About Words With Style” has capital A and W. Chicago headline style keeps prepositions lowercase regardless of length, producing “Learning about Words with Style.” Choose the style required by your publication instead of treating every word-initial capital as Title Case.
No automatic converter can determine every proper noun, brand spelling or context-sensitive part of speech. Check formal titles before publishing, especially names such as iPhone, eBay and product acronyms.
Writing case versus developer case
Uppercase, lowercase, Sentence and Title Case preserve punctuation, spaces and line breaks. Use them for prose, labels and headings. Developer formats first split punctuation, spaces and existing case changes into words, then join those words. For example, “XMLHttpRequest user ID” becomes xml_http_request_user_id in snake_case and xmlHttpRequestUserId in camelCase.
The converter treats each input line as its own identifier. That makes it useful for a pasted spreadsheet column: “Order Date” and “Customer ID” become orderDate and customerId without merging the rows. Digits remain part of an identifier, so “field 12” becomes field_12.
Unicode and privacy
Case mapping follows the Unicode rules built into your browser. Accented Latin letters are converted, and the German ß becomes SS in uppercase. Scripts without uppercase and lowercase distinctions, including Korean, Chinese and Japanese, pass through unchanged. Emoji and punctuation are retained in writing formats.
Conversion happens in the page, not on a server. Your last input and selected format are saved only in this browser so a refresh does not lose your work. Use Clear to remove the saved text from this browser.
Frequently asked questions
What is the difference between AP and Chicago Title Case?
AP Title Case capitalizes prepositions with four or more letters, while Chicago Title Case keeps prepositions lowercase unless they are the first or last word. For example, AP writes “A Guide About Writing” and Chicago writes “A Guide about Writing.”
What is the difference between camelCase and PascalCase?
camelCase starts with a lowercase word, as in userName, while PascalCase capitalizes the first word too, as in UserName. Both remove separators and capitalize each later word.
Does the case converter upload my text?
No. Conversion runs in your browser and text is not sent to a server. The page stores your latest input only in this browser’s local storage until you clear it.
Can I convert several names at once?
Yes. Paste one value per line. Developer formats preserve every line break, so a list of 20 column names returns a list of 20 separately converted identifiers.
Can it convert a large list without freezing the page?
Yes. Short input updates immediately. For text longer than 100,000 characters, conversion runs in a browser worker and shows a status message while the result is prepared, so the page remains responsive.
Will it preserve names and brand capitalization?
Not reliably. Lowercase, Sentence Case and Title Case normalize letter casing, so a brand such as iPhone may become Iphone. Review proper nouns, trademarks and acronyms before using converted text publicly.
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Updated 2026-10-13