Case Converter

Convert text to UPPER CASE, lower case, Title Case, Sentence case, and more, with auto-correct for the proper nouns and abbreviations you define.

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Free Online Case Converter Tool

Change the case of any text instantly, right in your browser. Paste your content, pick a case, and copy, share, or download the result - no sign-up, no character limits, and nothing ever leaves your device.

7 case styles in one click

  • Sentence case - capitalizes the first letter of every sentence, perfect for cleaning up text typed in all caps.
  • lower case - converts every letter to lowercase.
  • UPPER CASE - converts every letter to uppercase, great for headings that need to stand out.
  • Capitalized Case - capitalizes the first letter of every word.
  • Title Case - proper headline-style capitalization that keeps small words like "a", "the", and "of" lowercase unless they start or end the title.
  • aLtErNaTiNg cAsE - alternates upper and lower case letter by letter, useful for mocking text or stylized captions.
  • InVeRsE CaSe - flips the case of every character, turning what's uppercase into lowercase and vice versa.

Auto-correct proper nouns and abbreviations

Bulk-casing a whole paragraph can mangle brand names and abbreviations - "iPhone" becomes "Iphone", "ACME" becomes "Acme". Open the settings panel and add your own terms, one per line, in the exact casing you want. When auto-correct is on, those terms are restored automatically after every conversion, so your product names, initialisms, and usernames stay correct no matter which case you apply.

Built for real workflows

Copy the result straight to your clipboard, use the native share option to send it to another app, or download it as a .txt file if you need to keep a copy. Live character, word, and line counts update as you type so you always know the size of what you're working with. Your custom terms and preferences are saved locally in your browser, so they're ready the next time you visit.

This tool is completely free, works entirely client-side, and is safe to use for anything from social media captions to full documents.

Frequently Asked Questions

A case converter is a tool that changes the capitalization of text you provide, such as switching between uppercase, lowercase, Title Case, Sentence case, and more, without changing the letters or words themselves.

Capitalized Case uppercases the first letter of every word. Title Case follows standard headline style: it capitalizes the first letter of every major word but keeps small words like 'a', 'the', 'and', and 'of' lowercase unless they're the first or last word.

Open Settings (the gear icon) and add the term to your custom terms list, one per line, exactly as you want it to appear. With auto-correct enabled, that exact casing is restored after any conversion, even inside Title Case or UPPER CASE.

No. All conversions run locally in your browser with JavaScript. Your text is never sent to a server, and it disappears the moment you close or refresh the tab (custom terms and the auto-correct preference are the only things saved, locally on your device).

Yes, there's no length limit. Paste an entire article, script, or document and convert it instantly.