Two systems, one goal

Headline capitalization mostly comes down to two conventions. Title case capitalizes major words - common in newspapers, academia, and book covers. Sentence case capitalizes only the first word and proper nouns, matching how normal prose reads. Both are valid; the mistake is mixing them without thinking.

What title case signals

Title case gives headlines a formal, printed, and slightly more authoritative feel. Because most words are capitalized, it works well for article titles, study headers, and legacy editorial brands. Its downsides are subtle: more capital letters can feel visually busy at large sizes, and the exact rule set (which words stay lowercase) varies, so a title-case auto-converter can produce results that look wrong to picky editors.

What sentence case signals

Sentence case reads closer to spoken language and keeps heavy display type calmer and more scannable. It is the default in most modern SaaS, developer documentation, and web apps because long titles in sentence case still look like ordinary sentences rather than shouting. It also converts correctly every time, because the rule is simple.

How to choose for your site

  • Match your existing brand. If your product headings and navigation already use one style, do not switch randomly between the two per page.
  • Consider the platform. Search results and social feeds present your headline the way you wrote it, so pick the style that stays legible as a small text snippet.
  • Think about length. Long titles benefit from sentence case; short, punchy titles look sharp in either.

Practical consistency rules

  • Pick one style for H1s, another for cards and buttons if you want contrast - but keep each level consistent across the whole site.
  • Never use ALL CAPS for full headlines; it reduces readability and risks looking aggressive.
  • Whatever the style, keep proper nouns and product names capitalized correctly.

Use a converter to stay consistent

The fastest way to enforce a rule is a reliable case converter. Paste a list of your existing headlines, convert them all to the chosen style, and update the exceptions. A consistent system costs nothing and makes a site feel professionally edited.