Free Case Converter Online (Uppercase, Lowercase, Title Case)

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    How to Use the Case Converter

    1. Type or paste your text into the box, or drop in a .txt or .docx file.
    2. Pick a style: sentence case, title case, UPPERCASE, lowercase, or a code format like camelCase or snake_case.
    3. For title case, choose AP/APA or Chicago/MLA rules. The result updates as you type.
    4. Copy the result, download it as a .txt file, or grab any other format from the "Every format at once" list.

    Everything runs in your browser. Your text is never uploaded, stored, or sent anywhere.

    Every Case Style, Explained

    StyleExampleWhere it's used
    Sentence caseThe quick brown fox jumpsBody text, email subject lines, most UI labels
    Title CaseThe Quick Brown Fox JumpsHeadlines, blog titles, book and song titles
    Capitalized CaseThe Quick Brown Fox JumpsName lists, tags, labels where every word starts with a capital
    UPPERCASETHE QUICK BROWN FOXHeadings, signage, emphasis
    lowercasethe quick brown foxCleaning up text typed with caps lock on
    camelCasequickBrownFoxJavaScript and Java variables and functions
    PascalCaseQuickBrownFoxClass names, React components, C# methods
    snake_casequick_brown_foxPython variables, database columns
    CONSTANT_CASEQUICK_BROWN_FOXConstants and environment variables
    kebab-casequick-brown-foxURL slugs, CSS classes, file names
    Train-CaseQuick-Brown-FoxHTTP headers such as Content-Type
    dot.casequick.brown.foxConfig keys and property paths
    path/casequick/brown/foxFolder and route paths
    aLtErNaTiNg cAsEtHe QuIcK bRoWn FoXMemes and sarcastic replies
    iNVERSE cASEtHE qUICK bROWN fOXFixing text typed with caps lock accidentally on

    Title Case: AP vs. Chicago

    Both styles capitalize the first and last word of a title and every "major" word in between. They disagree on the small words. AP and APA lowercase articles, short conjunctions, and prepositions of three letters or fewer, so a word like "from" or "with" gets a capital. Chicago and MLA lowercase every preposition no matter how long, so "from," "with," and "between" stay lowercase. Every style capitalizes the first word after a colon or dash.

    Example: AP gives you "Lessons Learned From a Year With No Phone," while Chicago gives you "Lessons Learned from a Year with No Phone."

    Keeping Acronyms and Brand Names Intact

    Most case converters turn "NASA" into "Nasa" and "iPhone" into "Iphone." With the "keep acronyms and brand names" option on, words that are all caps or have a capital letter in the middle stay exactly as you typed them. If your entire text is in capitals, the option is ignored so the conversion still works.

    Case Converter FAQ

    Is my text uploaded anywhere?
    No. The conversion happens entirely in your browser. When you open a .docx file, a small open-source library loads to read the file, but the document itself never leaves your computer.
    What is the difference between title case and sentence case?
    Title case capitalizes most words, like "The Quick Brown Fox Jumps Over the Lazy Dog." Sentence case capitalizes only the first word of each sentence (plus anything you've set to keep, like acronyms), like "The quick brown fox jumps over the lazy dog."
    Which title case style should I use?
    Use AP for news articles, blogs, and most web headlines. Use APA for academic papers, since its rule for short words matches AP's. Use Chicago for books and long-form publishing, and MLA for humanities papers. If you have no style guide to follow, AP is a safe default.
    Why did sentence case lowercase a name?
    A converter can't tell a proper noun like "Washington" from an ordinary capitalized word, so sentence case lowercases it. Acronyms and mixed-case brands (NASA, iPhone) are kept when that option is on, but you'll need to recapitalize personal and place names by hand.
    Can I convert a list of variable names to camelCase or snake_case?
    Yes. Put one name per line and each line converts separately. The tool splits on spaces, punctuation, and existing capital letters, so "getUserID," "get user id," and "get-user-id" all become "get_user_id" in snake_case.
    Does it work with accented letters and other languages?
    Yes. Letters like é, ñ, and ü convert correctly, as do Greek and Cyrillic. Title case small-word rules are written for English, so titles in other languages may need a quick manual check.
    How much text can I convert?
    Pasting several megabytes works fine on a typical computer, and files up to 25 MB can be opened. The "Every format at once" list previews the start of your text, and clicking a row copies the full conversion.
    Can I open Word documents?
    Yes, .docx files. The text is extracted and formatting like bold and fonts is removed. Older .doc files aren't supported, so save them as .docx or .txt first.

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