If your document title looks more like a riddle than a clear heading, the colon might be your best friend.
Quick Fix: Use a single colon to separate main title and subtitle. Place it directly after the main title with a single space before the subtitle. Never use another colon in the subtitle. Capitalize the first word after the colon only if it’s a proper noun or starts a full sentence.
What’s Happening
Colons in titles act as a visual guide, splitting the main idea from the supporting detail.
A colon in a title acts like a flashing arrow: it points from the main idea to the supporting detail. As of 2026, style guides like The Chicago Manual of Style and AP Stylebook agree that a colon is the cleanest way to split a title into a main headline and a subtitle. The key is clarity—readers should know instantly where the main title ends and the explanation begins. Misuse the colon and your title can start to look like a run-on sentence dressed in a tuxedo.
Step-by-Step Solution
Follow these five steps to properly structure your title with a colon.
Identify the main title and subtitle. Ask: “Does everything before the split stand as a complete thought?” If yes, a colon is likely correct. Examples from Britannica include The Elements: A Visual Exploration and The Art of War: Great Commanders of the Modern World.
Type the main title. End it with a colon, no space yet.
Add one space. Place a single space after the colon before the subtitle begins.
Write the subtitle. Keep punctuation inside the subtitle only.
Capitalize correctly. Use title case for the main title. After the colon, capitalize the first word only if it’s a proper noun (e.g., Clouds: The Wild Journey of Water) or if it begins a full sentence (e.g., Sustainability: Make Every Day Earth Day).
Keyboard Shortcut
| Action | Windows | macOS |
|---|---|---|
| Insert colon | Shift + ; | Shift + ; |
| Move cursor to colon | Arrow keys or Ctrl + ← / → | Option + ← / → |
If This Didn’t Work
Try these alternatives when a colon doesn’t fit your title’s tone.
Em dash alternative. If the colon feels too abrupt, swap it for an em dash — with no space on either side — but use sparingly. Example: Learning Python—The Painless Way. Check your style guide; some prefer dashes for subtitles.
No punctuation at all. Short, punchy titles can skip punctuation: How to Fix Your Wi-Fi Without Calling Tech Support. Just keep the phrasing tight.
Question mark + colon combo. Rare, but if a full question ends your main title, keep the question mark and follow with a colon: Can AI Write a Hit Song: The New Frontier. Capitalize the word after the colon since it starts a new clause.
Prevention Tips
Catch colon mistakes before they reach your readers.
Run a “colon check.” After writing a title, search for extra colons. Delete any that aren’t separating main title from subtitle. A good rule: if you can remove the colon and the title still makes sense, you didn’t need it.
Use style tools. Browser extensions like Grammarly or Hemingway Editor flag misplaced colons in real time. Set them to “Title Case” mode to catch capitalization slips.
Read aloud. If your title sounds like a list or a riddle when spoken, simplify. A colon should clarify, not confuse. I once titled a blog post Writing: How to Stop Staring at a Blank Page and realized only after publishing that “Writing How to Stop” sounded like a how-to guide for erasing writing. Lesson learned.
