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Case converter

Paste, pick a case, and the text is rewritten in place. Counts update with it, so you can check a length limit after converting.

Your text
Most used words

Numbers appear here once you add text.

The four conversions

Each rewrites the text in the box. Convert, check the count, then copy.

  • UPPERCASE — every letter capitalised. Note that uppercase text is measurably slower to read in long runs, so keep it to labels and short headings.
  • lowercase — every letter lowered. Useful for normalising data before comparison, and for stripping accidental caps lock.
  • Title Case — first letter of every word capitalised. Simple and predictable, though not what most style guides actually specify.
  • Sentence case — first letter of each sentence capitalised, the rest lowered. The most common choice for headings in modern interface and editorial style.

Title case is not one thing

Style guides disagree about which words to capitalise, and our Title Case converter deliberately takes the simple route of capitalising every word. Where a house style applies, adjust by hand.

StyleRuleExample
APCapitalise words of four or more lettersThe Rise and Fall of a City
ChicagoCapitalise all but articles, short prepositions and conjunctionsThe Rise and Fall of a City
APACapitalise words of four or more lettersThe Rise and Fall of a City
Sentence caseCapitalise only the first word and proper nounsThe rise and fall of a city
Sentence case has become the default in product and interface writing because it reads faster and treats proper nouns as the only capitals, which makes them easier to spot.

Sentence case conversion is the one that most needs a human check afterwards: names, places, brands and the pronoun I all need capitals that an automatic rule cannot infer.

Common questions

Does converting case change my character count?

No. Case conversion swaps letters for their upper or lower forms and does not add or remove any, so the character count is identical before and after.

Why does sentence case leave proper nouns lowercase?

Because recognising a proper noun requires understanding meaning, not pattern. The converter capitalises after sentence-ending punctuation; names need restoring by hand.

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