Sentence Case Converter
Paste or type your text on the left. The converter instantly applies sentence case — capitalizing only the first word of each sentence and lowercasing everything else.
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What Is Sentence Case?
Sentence case is a capitalization style where only the first word of each sentence is capitalized, along with proper nouns. Every other letter is written in lowercase. It mirrors the natural capitalization rules of standard English writing.
For example: "the quick brown fox jumps over the lazy dog. it was a sunny day." becomes "The quick brown fox jumps over the lazy dog. It was a sunny day."
Sentence case is the default style for body text, emails, and most everyday writing. It's different from Title Case (where most words are capitalized) and UPPER CASE (where all letters are capitals).
When to Use Sentence Case
Body copy & articles — standard for paragraphs, blog posts, and news articles.
Email subject lines — many style guides (Google, Apple) prefer sentence case for subjects rather than Title Case.
UI labels & buttons — Google's Material Design recommends sentence case for most UI elements.
Social media captions — reads more naturally and conversationally than all-caps or title case.
Frequently Asked Questions
What is sentence case?
Sentence case capitalizes only the first word of each sentence (and any proper nouns), leaving all other letters in lowercase. It follows the same capitalization rules as a standard English sentence.
How is sentence case different from title case?
Sentence case capitalizes only the first word of each sentence. Title case capitalizes the first letter of most major words — nouns, verbs, adjectives, and adverbs — throughout the entire text.
Does the converter handle multiple sentences?
Yes. The converter detects sentence boundaries (periods, exclamation marks, and question marks followed by a space) and capitalizes the first letter of each new sentence automatically.
Is this tool free to use?
Completely free. No account, no sign-up, no limits. Paste your text and the conversion happens instantly in your browser.
Does my text get stored anywhere?
No. All conversion happens locally in your browser using JavaScript. Nothing is sent to any server. Your text stays completely private.