Title Case vs Sentence Case: Which Should You Use?

Almost every writing team eventually has this argument. Should headings be written in Title Case Like This, or Sentence case like this? Both are correct English. The difference is what they signal, how fast they read, and how much time your team will spend arguing about individual words.

The two styles, precisely

Title case capitalises the major words in a heading and leaves short function words lowercase. The first and last word are always capitalised regardless.

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Sentence case capitalises only the first word, plus any proper nouns. Everything else is lowercase, exactly as it would be mid-sentence.

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The rules for title case

If you commit to title case, you commit to a set of judgement calls:

• Capitalise nouns, pronouns, verbs, adjectives, and adverbs — always.
• Capitalise the first and last word, whatever they are.
• Lowercase articles: a, an, the.
• Lowercase coordinating conjunctions: and, but, or, nor, for, yet, so.
• Lowercase short prepositions: of, in, on, at, to, by, up, for.

The complications start immediately. Is "is" a verb that gets capitalised, or a short word that does not? (A verb — capitalise it.) What about "Up" in "Look Up the Answer", where it is part of a phrasal verb rather than a preposition? (Capitalise it.) What happens after a colon in a subtitle? (Capitalise the first word.)

The major style guides do not fully agree either. AP capitalises prepositions of four letters or more, so it writes "Over" and "With". Chicago lowercases all prepositions regardless of length, so it writes "over" and "with". APA uses a four-letter rule like AP. This is why two competent editors can produce two different, equally defensible versions of the same headline.

Why sentence case is winning

Over the last decade, style at most major software companies has shifted decisively to sentence case for headings, buttons, menu items, and documentation. Four reasons drive it:

It is faster to read. Readers partly recognise words by their outline shape. Extra capitals flatten those outlines and add visual noise, which is why scanning a page of title-case headings feels slightly heavier than scanning sentence case.

It has no edge cases. "Capitalise the first word" is a rule anyone on the team can apply identically, forever, without consulting a style guide. That consistency is worth more in practice than the marginal formality title case buys.

It translates. Most languages do not have title case at all — German capitalises all nouns, French and Spanish capitalise almost nothing in titles. A sentence-case source string localises cleanly; a title-case one has to be re-decided per language.

It reads as human. Title Case On A Button reads like a form from 1997. Sentence case reads like a person talking.

When title case is still right

Sentence case is not a universal answer. Use title case for:

• Published article headlines, if your publication's style calls for it — consistency within a publication matters more than the choice itself.
• Book, film, and album titles, where title case is a near-universal convention readers expect.
• Academic paper titles, where your target journal's style guide decides for you.
• Proper names of products and features that are genuinely proper nouns.

The one rule that matters most

Pick one and apply it everywhere. Mixed capitalisation across a site is far more noticeable — and looks far more careless — than either style used consistently. Write the choice down in your style guide, including which style guide you defer to for edge cases, and make it the default in your CMS.

When you need to convert existing copy, the title case converter applies the rules automatically, and the sentence case converter handles the other direction — including all-caps text that needs rescuing.