The two conventions, defined
Title case capitalizes the major words of a heading and lowercases the minor ones: The Quiet Power of Small Habits. Sentence case capitalizes a heading exactly like an ordinary sentence — first word and proper nouns only: The quiet power of small habits. That is the entire mechanical difference, and either can be produced in one click with our title case and sentence case converters. Everything interesting about the choice is in what each convention signals — and in the sometimes surprising conventions of the arena you are publishing into.
What each style signals
Title case reads as formal, produced, institutional. Those capitals are a kind of typographic dressing-up: they say an editor was here, this is a published work, this heading is an object with a name. That is why book covers and broadsheet front pages have used it for a century. Its cost is friction — capitals interrupt the reading eye, and at their worst they feel self-important.
Sentence case reads as conversational, modern, low-ceremony. A sentence-case heading feels like something a person said rather than something an institution issued. Its advantages are readability (word shapes stay natural) and honesty of tone; its cost is that in formal contexts it can read as under-dressed, and without capitals to mark them, long headings lean harder on good writing to hold their shape.
Arena by arena: who actually uses what
News
The traditional American newsroom convention is title case — it is why the AP title case rule set exists, and legacy US mastheads like the New York Times and Wall Street Journal still run title-case headlines. But the momentum is one-directional: British outlets (the Guardian, the BBC) standardized on sentence case years ago, and most digital-native newsrooms — the Verge, Vox, BuzzFeed News in its day — launched with sentence case and never looked back. In news, title case now signals legacy print DNA; sentence case signals web-native.
Academia
Academic style is the one arena where you routinely use both in the same document. APA, for example, requires title case for your paper's title, for headings, and for work titles mentioned in the text — but sentence case for article and book titles in the reference list. MLA and Chicago keep title case for titles across the board. The practical rule: in academic writing you do not choose a convention, you obey one — check the guide your field uses, and see our style guide comparison for which that is.
Books and publishing
Title case, nearly without exception — on covers, title pages and chapter titles, governed by Chicago rules. A sentence-case book title is a deliberate design statement (some literary fiction and poetry covers make it), not a neutral default. If you are self-publishing and want the book to read as professionally produced, use title case.
Web products and UI
Here the split is famous: Apple's human interface guidelines use title case for most interface labels (“Sign In”, “Delete Account”), while Google's Material Design mandates sentence case nearly everywhere (“Sign in”, “Delete account”) — and Microsoft moved from title case to sentence case across its products. Most modern SaaS interfaces follow the Google/Microsoft direction. Whichever you pick, UI is where inconsistency is most visible, because buttons and menus sit inches apart on the same screen.
Subject lines are a persuasion surface, and the evidence is mixed enough that testing beats doctrine. Title case reads as a formal announcement (fitting for a product launch or invoice); sentence case reads as one-to-one mail from a person (fitting for newsletters and outreach, and it tends to survive spam-filter heuristics that dislike Over-Capitalized Hype). Our email subject line page — and an A/B test on your own list — will settle it better than any rule of thumb.
Social and video
YouTube titles and thumbnail text skew title case (it reads as “produced content” in a feed of lowercase chatter), while native social posts on X, Threads or LinkedIn are ordinary sentences and should be sentence case. The occasional all-lowercase brand voice is a third option — a deliberate anti-formality statement that works only if the whole voice commits to it.
A tale of two brands
Put the two conventions side by side as brand decisions and the trade becomes concrete. Apple's title-case labels make every menu item read like a named feature — “Screen Time”, “Focus Mode” — reinforcing a premium, catalogue-like feel. Google's sentence-case interface makes the same kinds of features read like plain instructions — “Turn on dark theme” — reinforcing an approachable, utilitarian feel. Neither company is wrong; each casing choice is doing on-brand work. That is the real lesson for your own site: the choice is small, but it is a brand decision, so make it once, on purpose, and then enforce it everywhere.
How to choose: five questions
- Is the convention chosen for you? Academic guide, employer style sheet, publisher — if yes, obey it and stop here.
- What does your arena default to? Books and US news headlines → title case. UK news, modern web products, most tech blogs → sentence case. Defaults exist because readers' eyes are trained on them.
- What is your tone? Institutional, premium, produced → title case. Conversational, personal, utilitarian → sentence case.
- How much heading text do you ship? Heavy-UI products and documentation sites lean sentence case — hundreds of title-case labels get visually loud, and sentence case is easier for a team to apply consistently (fewer judgment calls per heading).
- Can you enforce it? The worst outcome is not either style — it is mixing them. If your team will not reliably remember which prepositions to capitalize, sentence case has fewer rules to get wrong; if you want title case, put a converter in the workflow.
The bottom line
Title case and sentence case are both correct; they are answers to different questions. Title case says this heading is a produced object; sentence case says this heading is something we are telling you. Match the signal to your arena and voice, write the decision down, and automate the mechanics — the title case converter (all five major styles) and sentence case converter make the consistent version of you one paste away. And if you go with title case, skim the common mistakes guide so the capitals land in the right places.
Frequently asked questions
- What is the difference between sentence case and title case?
- Title case capitalizes the major words of a heading ('The Quiet Power of Small Habits'); sentence case capitalizes only the first word and proper nouns ('The quiet power of small habits'), exactly like an ordinary sentence.
- Is sentence case more modern than title case?
- On the web, largely yes. British news, Google's Material Design, Microsoft products and most digital-native publications use sentence case, while title case remains standard for books, US legacy news headlines and Apple's interface style.
- Which is better for email subject lines?
- Neither wins universally. Title case reads as a formal announcement; sentence case reads as personal one-to-one mail and often performs as well or better. A/B test on your own audience — and avoid ALL CAPS, which consistently underperforms.
- Do academic papers use sentence case or title case?
- Both, by rule. In APA style the paper title, headings and titles mentioned in text use title case, while reference-list entries use sentence case. MLA and Chicago use title case for titles throughout. Follow the guide your field requires.