Sentence Case Converter
Sentence case is ordinary written English: the first letter of each sentence is capitalised and everything else is lowercase. Paste messy, shouty, or inconsistently capitalised text below and click Sentence case to normalise all of it at once.
Example
the quick brown fox jumps over the lazy dogThe quick brown fox jumps over the lazy dogHow sentence case detection works
The converter lowercases the entire block, then capitalises the first letter after each sentence-ending mark — a period, question mark, or exclamation mark followed by a space — plus the first letter of every line. That means multi-paragraph documents and bulleted lists come out correctly, not just single sentences.
What you may need to fix by hand
- Because the tool lowercases everything first, proper nouns lose their capitals — names, places, brands, and the pronoun "I". No automatic tool can reliably tell "apple the fruit" from "Apple the company" without understanding the sentence, so this is a deliberate trade-off: predictable output you can correct in seconds, rather than unpredictable guesses scattered through your document.
- Abbreviations with internal periods (e.g. "U.S.A.") can trigger an unwanted capital on the following letter.
- If you mainly need proper nouns preserved, convert to sentence case first and then use your editor’s find-and-replace for the handful of names in your text.
Sentence case is winning for headings
Style at most major tech companies and a growing number of publications has shifted from title case to sentence case for headings and UI labels. The reasoning: sentence case is faster to scan, avoids the constant judgement calls about which words to capitalise, and translates far more cleanly into languages that do not use title case at all. If you are writing product copy or documentation, sentence case is usually the safer default.