Sentence case Converter
Convert text to Sentence case. Only the first letter of each sentence is capitalized.
What is Sentence case?
Sentence case capitalizes only the first letter of the first word in each sentence and any proper nouns. It is the standard capitalization for everyday writing, paragraphs, emails, and social media posts.
HELLO WORLD. HOW ARE YOU?→Hello world. How are you?When to Use Sentence case
Use Sentence case for any running text: emails, blog body paragraphs, UI tooltips, descriptions, status messages, and social media posts. It reads most naturally because it matches how we read books and articles.
Do not use Sentence case for titles, headings, or navigation items where Title Case is expected by convention, or for acronyms and proper nouns that require their own capitalization rules.
Industry Standard
Sentence case is the default capitalization standard recommended by the Google Material Design and Microsoft Fluent Design guidelines for UI text — labels, tooltips, and descriptions should use sentence case, not title case.
How to Use This Sentence case Converter
- Paste or type your text into the Input Text box on the left.
- The output is converted to Sentence case instantly on the right.
- Click Copy to copy the result to your clipboard.
- Use Clear to reset and convert new text.
Sentence case in Programming Languages
str.charAt(0).toUpperCase() + str.slice(1).toLowerCase()str.capitalize()ucfirst(strtolower($str))str.capitalizeFrequently Asked Questions
Is this Sentence case converter free?
Yes, completely free — no signup, no account, no limits.
Does my text get stored or sent anywhere?
No. All conversions happen entirely in your browser using JavaScript. Your text never leaves your device and is never sent to any server.
When should I use Sentence case?
Use Sentence case for any running text: emails, blog body paragraphs, UI tooltips, descriptions, status messages, and social media posts. It reads most naturally because it matches how we read books and articles.
Expert tip
Google and Microsoft both moved their UI text from Title Case to Sentence case in recent years (e.g., Google Docs menus). Sentence case tests higher for readability and feels less formal — making it the preferred choice for modern app interfaces.