Sentence Case vs. Title Case: When to Use Each (Examples and Style Guide Rules)
Should your headline say "How to Write a Better Intro" or "How to write a better intro"? Both can be right. Here's how to choose, what the major style guides actually say, and the mistakes that make headings look sloppy.
Sentence case capitalizes only the first word and proper nouns: How to write a better intro.
Title case capitalizes the first, last, and most important words: How to Write a Better Intro.
- Use sentence case for most web headings, app buttons, email subjects, and long headlines. It's easier to read and harder to get wrong.
- Use title case for book titles, formal reports, and anywhere a style guide or house style requires it.
- Whatever you choose, use it consistently for every heading at the same level.
Capitalization looks like a tiny detail. But readers notice when a page mixes "How To Get Started" with "Why this matters" and "Next Steps." It makes the whole thing feel less careful, even if the writing is good.
It's also a question more people face than ever. You might write blog headings, YouTube titles, newsletter subject lines, LinkedIn posts, and app interface text, all in the same week. And AI tools and auto-formatters often capitalize headings differently every time you ask.
Here's a clear, practical way to decide.
The basicsThe difference in 30 seconds
| Sentence case | Title case | |
|---|---|---|
| Rule | First word and proper nouns only | First, last, and major words |
| Example | Why your first draft should be messy | Why Your First Draft Should Be Messy |
| Feels | Natural, direct, conversational | Formal, traditional, emphasized |
| Difficulty | Easy and consistent | Rules differ by style guide |
| Common in | Web headings, apps, emails, news headlines | Books, reports, academic headings, formal titles |
In both styles, proper nouns, brand names, and acronyms keep their normal capitalization: How to set up GitHub Actions in Tokyo vs. How to Set Up GitHub Actions in Tokyo.
Style 1Sentence case: the rules
Write the heading the way you'd write a normal sentence. Capitalize:
- The first word
- Proper nouns: names of people, places, companies, products, and brands
- Acronyms and words that are always capitalized, like AI, NASA, or I
- Often, the first word after a colon (many style guides do this in headings)
Everything else is lowercase. A few examples:
- How to read more books on a busy schedule
- What I learned from 100 days of writing on my iPhone
- Newsletter growth: Lessons from my first 1,000 subscribers
Headings in sentence case usually don't need a period at the end, even though they look like sentences.
Style 2Title case: the rules
Title case capitalizes the words that carry meaning and leaves most small connecting words lowercase. Nearly every title-case system agrees on the basics:
| Capitalize | Usually lowercase (unless first or last) |
|---|---|
| The first and last words | Articles: a, an, the |
| Nouns and pronouns: Writer, Your, It | Short conjunctions: and, but, or, nor |
| Verbs, including short ones: Is, Be, Do, Go | to in "to write," "to read" |
| Adjectives and adverbs: Better, Slowly | Some prepositions (this is where guides disagree) |
Title case doesn't mean capitalizing every word. How To Write A Better Intro is wrong in every major style. How to Write a Better Intro is right.
The tricky partWhere the style guides disagree
The big arguments are about prepositions, the small words like from, with, and along. Here's one heading written in five styles:
| Style | Result | Why |
|---|---|---|
| Sentence case | Notes from a walk along the river with my dog | Only the first word is capitalized |
| AP headlines | Notes from a walk along the river with my dog | AP uses sentence-style capitalization for news headlines |
| APA (7th ed.) | Notes From a Walk Along the River With My Dog | Capitalizes words of four letters or more, including prepositions |
| Chicago (18th ed.) | Notes from a Walk Along the River with My Dog | Capitalizes prepositions of five letters or more |
| MLA | Notes from a Walk along the River with My Dog | Keeps prepositions lowercase regardless of length |
All three title-case versions are correct, just under different rules. That's why two capitalization tools, or two AI tools, can give you different answers for the same heading.
One more thing to know: Chicago changed this rule in its 18th edition, released in 2024. Older advice that "Chicago lowercases all prepositions" is now out of date.
Big tech style guides, including Google's developer documentation style guide and Microsoft's writing style guide, recommend sentence case for most headings and interface text, partly because it's easier to read and translate.
DecideWhich one to use, and where
If a publication, school, or client gives you a style guide, follow it. If not, use these defaults:
| You're writing… | Good default |
|---|---|
| Blog post title | Your site's house style (either works) |
| Headings inside a blog post | Sentence case |
| Newsletter or email subject line | Sentence case |
| App buttons, menus, and form labels | Sentence case |
| YouTube or podcast episode title | Either, but keep it consistent across your channel |
| Book, film, or report title | Title case |
| Academic paper | Your required guide (APA, MLA, Chicago) |
| Reference list or bibliography | Exactly what your citation style says |
| Resume section headings | Either, applied consistently |
A useful rule of thumb: the longer the heading, the better sentence case looks. Compare these:
- How to Choose the Right Capitalization Style for Every Heading on Your Website
- How to choose the right capitalization style for every heading on your website
Both are correct. The second is calmer and easier to scan, especially on a phone, where a long heading can wrap across three or four lines.
Avoid these8 common capitalization mistakes
Each one is easy to spot once you know to look for it.
1Capitalizing every single word
How To Get Better At Writing In A Month isn't title case. It's just capitalized. Articles, short conjunctions, and to in infinitives stay lowercase in every major style.
Reality: Capitalizing everything doesn't make a heading look more important. It makes it look unedited.
2Lowercasing brand names in sentence case
Sentence case doesn't mean "lowercase everything after the first word." How to use iphone shortcuts in google docs is wrong. How to use iPhone shortcuts in Google Docs is right.
Reality: Brand and product names keep their official spelling in both styles: iPhone, YouTube, GitHub, LinkedIn.
3Mixing styles at the same level
If one H2 says "Why This Matters" and the next says "What to do next," readers notice, even if they can't say why. It's the most common capitalization problem on blogs.
Reality: Consistency matters more than which style you pick. Same level, same rule.
4Trusting AI tools and auto-capitalizers blindly
AI writing tools and automatic title-case features often switch styles from one request to the next, or follow a style guide you didn't choose. Some capitalize every word.
Reality: A tool can apply a rule. It can't know which rule your site uses unless you tell it, and check its work.
5Using ALL CAPS for emphasis
ALL CAPS HEADINGS ARE HARDER TO READ, because words lose their familiar shapes. They also read as shouting in emails and posts. Save caps for very short labels or design elements.
Reality: If a heading needs emphasis, make it shorter and clearer, not louder.
6Forgetting the word after a colon
In title case, the first word after a colon is capitalized: Writing Habits: A Beginner's Guide. In sentence case, many style guides capitalize it too in headings. Pick one approach and stay with it.
Reality: Colons start a new mini-title. Treat the word after them like the start of one.
7Getting hyphenated words wrong
In title case, most guides capitalize both parts of a hyphenated major word: Long-Term Goals for Self-Taught Writers. In sentence case, only the first word of the heading gets a capital: Long-term goals for self-taught writers.
Reality: Hyphenated words are where title case trips people up most. Check your style guide when it matters.
8Copying a source's capitalization into a citation
Citation styles often change a title's capitalization. APA, for example, uses title case for your paper's title and headings, but sentence case for article and book titles in the reference list.
Reality: In a citation, follow the citation style, not the way the title looked on the cover or web page.
Pick a house style and write it down
The easiest way to stay consistent is a one-line rule that everyone, including your AI tools, can follow. Different levels can use different styles, as long as each level is consistent.
For example, this blog uses:
- Article titles: title case
- Section headings and subheadings: sentence case
- Buttons, labels, and captions: sentence case
If you write with AI tools, paste your house style into your instructions, so you get the same capitalization every time. And if you're part of a small writing community or team, share the rule there too. It saves a surprising number of review comments.
A quick pre-publish checklist
- Is there a style guide or house style I'm supposed to follow?
- Are all headings at the same level in the same style?
- Did brand names and acronyms keep their correct capitalization?
- If I used title case, do I know which version I'm following?
- Is this heading long enough that sentence case would read better?
- Did I avoid ALL CAPS?
If you can't name which title-case rules you're following, sentence case is usually the safer choice.
Wrapping upThe verdict
Sentence case is the best default for most modern writing: web headings, emails, apps, and long headlines. It's natural to read and hard to get wrong.
Title case is the right choice when convention calls for it: books, reports, academic work, and publications with an established style. Just know which rules you're following.
Either way, the real goal is the same: pick a rule, write it down, and use it every time.
Check your headline length too
Search results usually show around 60 characters of a title. Paste yours in and check the character count before you publish.
Try How Many WordsFrequently asked questions
What is the difference between sentence case and title case?
Sentence case capitalizes only the first word and proper nouns, like "How to write a better intro." Title case capitalizes the first, last, and major words, like "How to Write a Better Intro."
Should blog headings be in sentence case or title case?
Either is fine, but sentence case is a strong default for headings inside a post because it's easier to read, especially for longer headings. Many sites use title case for the article title and sentence case for headings within it.
Do you capitalize "with," "from," and "about" in title case?
It depends on the style guide. APA capitalizes words of four letters or more, so "With," "From," and "About" are capitalized. Chicago (18th edition) capitalizes prepositions of five letters or more, so "About" is capitalized but "with" and "from" are not. MLA keeps prepositions lowercase.
Does AP style use title case for headlines?
No. AP style uses sentence-style capitalization for news headlines: capitalize the first word and proper nouns only.
Should email subject lines use title case?
For most emails, sentence case feels more natural and personal. Title case can work for formal announcements, but keep it consistent across your emails.
Is title case more professional than sentence case?
Not automatically. Major tech companies like Google and Microsoft use sentence case in their professional documentation. Clarity and consistency matter more than which style you choose.