Knowing when to capitalize a word according to the Chicago Manual of Style's rules for headline capitalization can be tricky. But fear no more: this tool will do the job for you*:

Capitalize all prepositions of four or more letters?

Capitalized title: Type Title Here


*Mostly. It's not foolproof (nor does it constitute editorial guidance). Known deficiencies include:

If anything in your output looks odd, shoot me an email, and I'll get back to you on whether you should capitalize or lowercase it according to Chicago style.

For an instantaneous second opinion, I recommend Title Case Converter, a rather fancier tool that can also provide (approximate) headline caps in AP, MLA, and Wikipedia styles.

And if you find yourself returning to this page more often than you'd like, perhaps it's time to outsource your capitalization to a pro? Check my Services page to see how I can help you with this and other copyediting tasks.