Overview:
You’re formatting a heading and you hit that moment of doubt. Should “of” be capitalized? What about “the”? Is this supposed to look like a sentence or like a title?
That confusion comes down to one simple distinction: sentence case vs title case. Once you understand the rule behind each one, you’ll never second guess a heading again. In this post, you’ll learn exactly how each style works, which style guides require which one, and how to convert your text into either format in seconds using the tools linked below.
What Is Sentence Case?
Sentence case capitalizes only the first word of a title, plus any proper nouns, just like a regular sentence.
Example: “The mystery of the missing red ruby”
Notice that only “The” gets a capital letter. Nothing else does, unless it’s a name or a place. This is why sentence case feels so natural to read. Your eyes don’t have to stop and process a capital letter at every word. For long headings especially, that makes a real difference in reading speed.
If you want to convert a block of text into sentence case without doing it by hand, our Sentence Case Converter does it instantly. Paste your text, click convert, and you’re done.
What Is Title Case?
Title case capitalizes the first letter of every major word in a heading. Minor words like articles, short conjunctions, and short prepositions stay lowercase, unless they open or close the title.
Example: “The Mystery of the Missing Red Ruby”
The tricky part is knowing what counts as a “major” word. According to APA Style’s official capitalization rules, major words include nouns, verbs, adjectives, adverbs, pronouns, and any word that’s four letters or longer. Minor words are short conjunctions, short prepositions, and articles like “a,” “an,” and “the.”
That’s why “of” stays lowercase in our example even though it sits in the middle of the title, while “Mystery” gets a capital because it’s a noun.
Want to skip the mental math? Our Case Converter applies title case automatically. Just paste and convert.
Sentence Case vs Title Case: Side by Side
Seeing real examples side by side makes the difference click faster than any explanation can.
| Sentence Case | Title Case |
| The role of content in SEO | The Role of Content in SEO |
| 10 tips for better sleep | 10 Tips for Better Sleep |
| Why remote work is here to stay | Why Remote Work Is Here to Stay |
| How to start a small business | How to Start a Small Business |
Look closely at the title case column. Notice “in,” “for,” and “to” all stay lowercase. They’re short prepositions, which means they’re minor words under almost every style guide.
Which Style Guides Require Which Case?
Different style guides have different rules, and this is where most of the confusion actually comes from. Here’s a quick breakdown.
AP style uses sentence case for news headlines. Title case in AP is reserved only for the titles of books, movies, and other named works, not for the headlines themselves.
APA style (the 7th edition, which most schools use today) uses title case for the title of the paper you’re writing, but it requires sentence case for the titles of any sources listed in your reference list. This one rule trips up more students than any other part of the comparison, so it’s worth remembering on its own.
MLA style uses title case for titles of works, similar to APA. One small but real difference: MLA does not capitalize the infinitive “to,” while AP does in certain cases. It’s a tiny detail, but it’s the kind of thing that costs points on a paper if you miss it.
Chicago Manual of Style uses title case consistently, even for the titles of sources in a bibliography. This is the opposite approach from APA, which is one more reason students mix the two up.
If you’re not writing for a specific style guide (a personal blog, a newsletter, a social post) the choice is yours. Plenty of modern websites default to sentence case these days simply because it reads more naturally online.
When Should You Use Sentence Case?
Reach for sentence case when:
- You’re writing subheadings for a blog post or article
- You’re following AP style for a news headline
- You’re listing sources in an APA reference list
- Your heading is long, and you want it to read smoothly rather than feel choppy
When Should You Use Title Case?
Reach for title case when:
- You’re titling a book, movie, song, or any other named composition
- You’re writing a paper title under MLA or Chicago style
- You’re formatting something formal, like an invitation or an event name
- Your heading is short, and you want it to carry visual weight
Convert Your Text in Seconds
You don’t have to memorize any of these rules to get it right every time. Just paste your text into one of our free tools and let it handle the formatting for you.
Use the Sentence Case Converter when you need natural, readable headings. Use the Case Converter when you need proper title case for a formal heading or a paper title. Paste your text, pick your case, copy the result. That’s the whole process.
Frequently Asked Questions
Is sentence case or title case more common online?
Sentence case has become the more common choice on modern blogs and digital publications. It feels less formal and reads more naturally than title case, which is part of why so many sites have shifted toward it for headings and subheadings.
Does Google care which case I use for headings?
Not directly. There’s no ranking boost for choosing one case style over the other. What actually matters for SEO is clarity and readability, and both styles can deliver that when used correctly.
Can I mix sentence case and title case on the same site?
Yes, and a lot of sites do exactly that. A common approach is title case for the main page title and sentence case for subheadings within the body. Consistency within each content type matters more than forcing the same style everywhere.