Case Converter

Instantly convert text between Uppercase, Lowercase, Title Case, Sentence case, and more. Clean and format your text.

How This Tool Works
100% Client-Side

Your data never leaves your device. All processing happens locally in your browser. No text is sent to any server, no data is stored, and no cookies track your usage.

Text is transformed using JavaScript string methods and regular expressions. Each case style applies different capitalization rules to your input text in real-time.

  • Title Case uses word boundary regex for proper capitalization
  • Sentence case detects sentence endings (. ! ?) to capitalize first letters
  • Inverse case toggles each character's case individually
How to verify this yourself

Check your browser's Network tab to see nothing is sent:

  1. Open DevTools: Right-click anywhere on the page → "Inspect" (or press F12)
  2. Go to Network tab: Click "Network" at the top of the DevTools panel
  3. Use the tool: Type or paste text and watch the Network tab
  4. Verify: You'll see no requests to external servers — all processing is local

Works in Chrome, Firefox, Safari, and Edge.

Case Styles Explained

  • Title Case: Capitalizes the first letter of each major word. Perfect for headlines.
  • Sentence Case: Capitalizes only the first letter of the first word (and proper nouns). Best for body text.
  • Uppercase: SCREAMING MODE.
  • Alternating Case: Often used for mocking or SpongeBob memes.