Free Sentence Case Converter Online
Capitalize only the first letter of each sentence — perfect for body text, paragraphs, and modern web copy.
A sentence case converter capitalizes only the first letter of each sentence, lowering everything else. Notepad AI's converter detects sentences by punctuation (. ! ?) and runs entirely in your browser.
Related Tools
Sentence Case Converter FAQ
What is Sentence case?
Sentence case is a capitalization style where only the first letter of each sentence is uppercase. Everything else is lowercase. Example: 'This is sentence case. Each sentence starts with a capital.' It's the standard style for paragraphs, blog body text, and prose.
Is the sentence case converter free?
Yes — completely free, no signup, no login, no character limits.
How does it detect sentences?
Sentence boundaries are detected by sentence-ending punctuation (.!?) followed by whitespace. The first letter after each boundary is capitalized; everything else is lowercased.
What about proper nouns?
Proper nouns (names, places, brands) won't be capitalized by this tool unless they start a sentence. After conversion, manually capitalize any proper nouns. We may add proper-noun detection in a future update.
Is my text private?
Yes. All conversion happens in your browser. No data is uploaded or logged.
Sentence case vs Title Case — which should I use?
Sentence case for body text, paragraphs, descriptions, and most modern web copy (Google, Apple, GitHub all use Sentence case in their UI). Title Case for headlines, article titles, book names, and section headings.