Title Case vs Sentence Case: When to Use Each

"How To Write a Blog Post" or "How to write a blog post." Same eight words, two different cases. The first is title case — every important word capitalized. The second is sentence case — only the first word (and any proper noun) capitalized. Pick the wrong one and your headline looks either shouty or sloppy.

This guide covers what each case actually is, the capitalization rules that trip people up, and a simple way to decide which one to use — for a headline, a button, an email subject, or a document title.

The two cases, defined

Title case capitalizes the first word, the last word, and every "major" word in between — nouns, verbs, adjectives, adverbs, and pronouns. Small joining words stay lowercase. Example: The Quick Guide to Writing Better Headlines.

Sentence case capitalizes only the first word and any proper nouns, exactly as you'd write a normal sentence. Example: The quick guide to writing better headlines.

The difference is small on screen and huge in tone. Title case reads as formal and editorial. Sentence case reads as modern, calm, and human.

The rule that trips everyone up

In title case, which small words stay lowercase? The short answer: articles (a, an, the), coordinating conjunctions (and, but, or, nor, for), and short prepositions (in, on, at, to, of, by). Everything else gets a capital.

But "short" depends on the style guide, and this is where two articles on the same site can disagree:

So A Guide to Working From Home in AP style becomes A Guide to Working from Home in Chicago, because Chicago lowercases "from." One rule never changes: the first and last word are always capitalized, even if they're tiny — To Be or Not to Be keeps that opening "To" capital.

Which case should you actually use?

There's no single correct answer — it depends on where the text lives and the tone you want.

• Use title case for editorial headlines (especially US/AP-style publications), book and article titles, and formal document headings. It signals "this is a title."
• Use sentence case for app and website UI, buttons, form labels, email subject lines, and most modern brand writing. Apple, Google, and most product teams switched to sentence case years ago because it reads faster and feels less corporate.
• British English leans toward sentence case for headlines far more than American English does.

If you're unsure, sentence case is the safer modern default. It's harder to get wrong — there are no "which words to capitalize" judgment calls — and it almost never looks dated.

Beyond the two: the other cases you'll meet

Text case is not just two options. Depending on what you're doing, you'll also run into:

• UPPERCASE — all caps, for short labels or emphasis (use sparingly; long all-caps text is hard to read).
• lowercase — everything down, for a deliberately casual or minimal look.
• camelCase and snake_case — for variable names in code (userName, user_name).
• kebab-case and URL slugs — for web addresses (title-case-vs-sentence-case).

Switching between all of these by hand is slow and error-prone, especially across a long headline or a list of titles.

Convert any text in one click

Instead of retyping, paste the text into the free Case Converter and pick a mode — UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, or a URL slug. It converts instantly and you copy the result. It runs entirely in your browser, so nothing you paste is uploaded anywhere.

If you write titles for the web, pair it with the Word Counter to keep headlines under the length Google shows in results (about 60 characters) — case fixes how a title looks, length fixes whether it gets cut off.

Quick takeaways

• Title case: capitalize the first word, the last word, and all major words. Keep articles, short conjunctions, and short prepositions lowercase.
• Sentence case: capitalize only the first word and proper nouns.
• AP vs Chicago: they disagree on prepositions — AP capitalizes 4-letter-plus ones, Chicago lowercases them all. Pick one style and stay consistent.
• Default to sentence case for UI, buttons, and modern brand copy; use title case for editorial and formal titles.
• Don't recapitalize by hand — switch any text between cases instantly with a case converter.