📄 Sentence Case Converter
Convert text to proper Sentence case automatically. Capitalises the first letter of each sentence while lowercasing the rest — instantly, free, no login.
What is Sentence Case and When to Use It?
Sentence case is a capitalization convention that mirrors natural writing: the first letter of the first word in a sentence is capitalized, proper nouns keep their capitals, and all other letters are lowercase. It is the way most written English naturally flows — readable, approachable, and consistent with how people process text.
In modern digital design, sentence case has become the dominant choice for user interfaces. Google's Material Design 3 guidelines explicitly specify sentence case for all button labels, navigation items, tab labels, and form elements. Apple's Human Interface Guidelines follow the same convention for most UI text. The reasoning is readability research — sentence case is faster to scan than title case because the capitalization pattern matches normal reading expectations.
For content writers, sentence case is appropriate for body paragraphs, social media posts, email subject lines (in modern professional communication), and any copy where a conversational, accessible tone is desired.
Sentence Case vs Title Case — Complete Comparison
| Format | Example | Use For |
|---|---|---|
| Sentence case | How to build a website | Body text, UI labels, buttons, social posts |
| Title Case | How to Build a Website | Article titles, book names, formal headings |
| UPPERCASE | HOW TO BUILD A WEBSITE | Acronyms, emphasis, legal documents |
| lowercase | how to build a website | URLs, usernames, code variables |
Frequently Asked Questions
What is sentence case?
Sentence case capitalizes only the first letter of the first word in each sentence and any proper nouns, while keeping everything else lowercase. It is the standard for body text, UI labels, and most conversational content. Google's Material Design and Apple's HIG both specify sentence case for button labels and UI elements.
What is the difference between sentence case and title case?
Sentence case: only first word and proper nouns capitalized — "How to build a website." Title Case: first letter of most words capitalized — "How to Build a Website." Sentence case suits body text and UI; title case suits formal headlines and book titles.
When should I use sentence case instead of title case?
Use sentence case for body paragraphs, button labels, UI form fields, social media, and email subject lines in modern professional communication. Use title case for article headlines, book titles, formal report headings, and product names.