Ask three editors to capitalize 'a guide to working from home' and you'll get at least two different answers, each one defensible. Title case isn't a single standard, it's a family of feuding ones. This guide covers how AP and Chicago disagree, what happens to the small words, and how an automatic converter decides. One real headline gets worked through both rulebooks so you can see exactly where they split.
It looks easier than it is.
Capitalize the big words, lowercase the little ones. That's the folk version of title case, and it survives until the first hard case arrives. Is 'is' a little word? It's two letters, but it's a verb, and every major guide capitalizes verbs. What about 'with'? Four letters, preposition, and the answer genuinely depends on which style guide your publication follows.
The cost of getting it wrong is credibility rather than clarity. Readers still understand a mis-capitalized headline, but editors, clients, and detail-oriented customers notice, and inconsistency across a site reads as carelessness. Teams that publish daily need the rules applied the same way by every writer, which is precisely what humans are bad at and automation is good at.
The four-letter fault line.
AP style, the newsroom standard, has a mechanical core: capitalize every word of four or more letters, plus all verbs, nouns, pronouns, adjectives, and adverbs regardless of length. So AP writes 'Working From Home' because from has four letters, and capitalizes Is and Be because they're verbs.
Chicago, the book publishing standard, ignores length and rules by part of speech: prepositions stay lowercase no matter how long, so 'Working from Home' keeps from down, and even between and through stay lowercase in Chicago headlines. That one difference explains most title disagreements you'll ever witness. Neither is wrong. Pick the guide that matches your world, journalism and marketing lean AP, books and academia lean Chicago, and then stop relitigating it.
The contested territory.
Articles are easy: a, an, and the stay lowercase everywhere except first or last position, and all guides agree. Coordinating conjunctions like and, but, or, and nor stay down too. The fights happen over prepositions and over two-letter words that moonlight as other parts of speech.
Consider 'up' in 'Look Up the Answer' versus 'Walking up the Hill'. In the first, up belongs to the phrasal verb look up, and both AP and Chicago capitalize it. In the second it's a plain preposition and stays down in Chicago. A lookup table can't settle this alone. Any automatic tool, this one included, works from fixed word lists that get the common cases right and leave phrasal verbs to your judgment. The Title Case Converter always capitalizes up, which is right for Look Up the Answer but needs a manual fix in a Chicago headline like Walking up the Hill.
AP, Chicago, and the tool.
Input: 'the art of working from home'. Chicago output: 'The Art of Working from Home', with of and from lowercase as prepositions and The capitalized only because it leads. AP output: 'The Art of Working From Home', identical except From, promoted for having four letters.
The Title Case Converter has a Style guide menu with AP, APA, Chicago, MLA, Bluebook, AMA, the New York Times and Wikipedia, so you don't have to guess which list it uses, and it highlights every word it changed. With AP selected, 'the art of working from home' comes out as 'The Art of Working From Home'. Switch to Chicago or MLA and from drops to lowercase. 'a room with a view' behaves the same way: 'A Room With a View' in AP and APA, 'A Room with a View' in Chicago and MLA.
A few rules apply in every style. The first and last words are always capitalized, and so is the word after a colon. Acronyms like NASA and brand names like iPhone are kept as typed, while a headline typed entirely in capitals is treated as ordinary text. Paste several headlines, one per line, and each line is converted as its own title.
Learn them once.
A handful of mistakes account for nearly all title case corrections:
Process beats memory.
Write the decision down once: a single line in your style doc saying 'headlines use AP title case' or 'Chicago, always' ends the per-headline debates. Then make the converter part of the publishing path, set to that style, so every H1 and email subject passes through it before going live. Consistency produced by a pipeline survives staff turnover; consistency produced by memory doesn't.
For legacy content, resist the urge to fix everything at once. Convert titles as posts get updated for other reasons, and prioritize the pages that appear in navigation menus and search results, since those are the places where a mixed style is visible side by side.
Boundaries of the job.
Plenty of respected publications skip title case entirely and run sentence-style headlines, capitalizing only the first word, a look that reads as modern and works especially well for long, conversational titles. If that's your house style, choose Sentence case in the Title Case Converter's Convert to menu, or Wikipedia style, and names you typed with a capital stay capitalized. The Case Converter also has a Sentence case card, along with the programmer formats for slugs and identifiers.
Length is the other half of headline quality. A perfectly capitalized title that truncates in search results still fails, so check it against the 60 character title tag budget with the Character Counter. And when the headline sits atop a long article, the Reading Time Calculator tells you what estimate to print beside it.
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