🔤 Case Converter

The Case Converter turns any block of text into UPPERCASE, lowercase, Title Case, or Sentence case in one click. It's the kind of small utility you reach for constantly: fixing headlines that came back from a client in all caps, normalising a list of product names copy-pasted from ten different sources, converting a screaming email to something calmer, or preparing text for a style guide that requires one case scheme throughout. Everything runs in your browser using JavaScript's built-in case-conversion methods, which handle basic Unicode letters correctly (café → CAFÉ, not CAFé).

How to Use This Tool

Paste or type your text into the box and press the button for the case you want. UPPERCASE and lowercase convert every letter without changing punctuation, whitespace, or numbers. Title Case capitalises the first letter of every word (including short words — customise afterwards if your style guide keeps articles and prepositions lowercase). Sentence case lowercases everything and then capitalises the first letter after each period, question mark, or exclamation mark. Reset clears the input. Copy the result and paste it wherever you needed it.

SEO Best Practices

For headlines, real title-case rules vary by style guide (AP capitalises "of" differently to Chicago) — use this as a fast starting point and hand-fix the short words afterwards. For product names, SKUs, and code identifiers, be careful with lowercase: it will change "iPhone" to "iphone" and "eBay" to "ebay", which is usually not what you want. Sentence case is the safest all-round option for long user-generated text like reviews or forum posts that came in shouting.

Example

Pasting "the quick BROWN fox JUMPS over the lazy DOG. and IT was HAPPY." then pressing Sentence case returns "The quick brown fox jumps over the lazy dog. And it was happy." — every letter lowercased first, then each new sentence capitalised.

Common Mistakes to Avoid

Don't Title-Case brand names that use non-standard casing (iPhone, eBay, LaTeX, WordPress) — a mechanical converter will always get these wrong. Don't use uppercase for emphasis in long-form writing; screen readers announce it letter-by-letter and it hurts readability. Don't rely on any case converter for languages with special rules (Turkish dotted/dotless i, German ß→SS) without checking the output manually.