Which Case Should You Use?
Use UPPERCASE for abbreviations, acronyms, and design contexts where capitalization adds visual emphasis. Use lowercase for body text, casual writing, and code identifiers. Use Title Case for blog post headlines, article titles, email subject lines, book and film titles, and navigation menu labels. Use Sentence case for product descriptions, social captions, and conversational text. Use camelCase, snake_case, or kebab-case when naming variables, CSS classes, or URL slugs.
Title Case Rules: Which Words Get Capitalized?
Style guides differ slightly, but the general rule for Title Case is: capitalize nouns, verbs, adjectives, adverbs, and the first and last words of the title. Leave lowercase: articles (a, an, the), short prepositions (in, on, at, by, for, of, to), and short conjunctions (and, but, or, nor). For example: The Best Way to Write a Title. An automated title case converter handles these rules for you without needing to memorize the exceptions.