Title Case and Sentence case are the two capitalisation styles you will reach for most when writing headings. Knowing which to use keeps your content looking polished and consistent — and most major style guides have firm opinions about it.
What is Title Case?
In Title Case, the first and last words and all the principal words are capitalised, while short articles, conjunctions and prepositions (a, an, the, and, or, of, in) stay lowercase unless they begin the title. Example: The Quick Guide to Writing Better Headlines.
What is Sentence case?
Sentence case capitalises only the first letter of the heading and any proper nouns, just like a normal sentence. Example: The quick guide to writing better headlines. It feels friendlier and is increasingly popular in modern interfaces and documentation.
Which one should you choose?
Editorial and journalistic styles (such as AP and Chicago) often favour Title Case for headlines, while many technology companies and UX teams prefer Sentence case for its readability and approachability. The most important rule is consistency: pick one style for each type of element — page titles, section headings, buttons — and apply it everywhere.
Convert between them instantly
Rather than re-capitalising by hand, paste your heading into a case converter and toggle between Title Case and Sentence case to see which reads better. This is especially handy when migrating content between a blog that uses one style and a documentation site that uses the other.