The em dash (—) is a long punctuation mark, about as wide as a capital M. It sets off an aside, marks a sudden break, or adds emphasis. You type it with Alt + 0151 on Windows or Shift + Option + hyphen on Mac.
Is it a sign of AI writing? Not by itself. Pew Research says so directly, and I'll show you the numbers below.
What Is an Em Dash?
Let's start simple. The em dash is a long dash that can replace a comma, a colon, or parentheses. That's how Merriam-Webster describes it.
It gets its name from its width. Printers measured it against the letter M.
You'll see it used for a parenthetical dash (an aside), for interrupted dialogue, and for punchy emphasis. Simple, right? The tricky part is telling it apart from its two lookalikes.
Em Dash vs. En Dash vs. Hyphen
These three punctuation marks each have one job. Mix them up and editors will notice. Here's the side by side.
Mark | Symbol | Unicode | Main job | Example |
|---|---|---|---|---|
Hyphen | - | U+002D | Joins words | well-being |
En dash | – | U+2013 | Ranges, connections | 2020–2023 |
Em dash | — | U+2014 | Breaks or sets off a thought | She arrived—late, as usual—and sat down. |
The en dash is half the length of an em dash. The em dash has been in Unicode since 1993.
How to Use an Em Dash: 5 Steps
Here's the good news: you don't need a grammar degree. You need a quick test. These five steps take about ten seconds per sentence. Open your draft and try them.
Read the sentence out loud. If your voice jumps or changes direction, you've found a spot for a dash.
Try a comma first. If it works, use it and move on.
Still too weak? If parentheses feel too quiet, use the dash.
Count them. One pair per paragraph is plenty.
Check your spacing against your style guide (see the table below).
Example: I wanted to quit—then my sister called. The dash does the turning for you.
How to Type an Em Dash
There's no em dash key on your keyboard. Annoying, I know. But every platform has a trick, and each takes about two seconds. Here's the keyboard shortcut cheat sheet.
Platform | Shortcut | Source |
|---|---|---|
Windows | Hold Alt, type 0151 on the numeric keypad (the alt code) | |
Mac | Shift + Option + hyphen | Zapier |
Microsoft Word | Type 2014, then press Alt + X | Technobezz |
HTML |
| codepoints.net |
Bookmark this table. You'll forget the codes by tomorrow. Everyone does.
Does your device keep changing your punctuation as you type? Then it's worth learning how to disable autocorrect so your dashes stay exactly as you typed them.
Em Dash Spacing: Chicago vs. AP
Spaces around the dash depend on your guide. American styles split into two camps. Pick one and stick with it, because consistency beats perfection.
Style guide | Spacing | Source |
|---|---|---|
Chicago Manual of Style | No spaces | Tortora |
AP Stylebook | Space on both sides, and no en dashes | PR Daily |
British style | Often a spaced en dash instead |
Writing for the web? Either works. Just don't mix them in one post.
Is the Em Dash an AI Tell?
Since 2024, people have joked about the "ChatGPT hyphen." I get why. When AI generated text floods your feed, every long dash looks suspicious. But the data is messier than the memes.
What the Numbers Show (as of August 2026)
Pew analyzed about 490,000 English webpages. According to Search Engine Journal, em dash use rose from 5.79 to 11.19 per 10,000 words between early 2023 and early 2026.
Pew also found signs of AI writing or editing on about 10% of pages sampled in July 2026. Among pages published after ChatGPT launched, the figure was 35%, per Statista.
Still, Statista notes the dash alone doesn't prove AI authorship. It's far older than ChatGPT. Emily Dickinson wrote nearly 1,800 poems packed with dashes.
OpenAI also acknowledged the habit. In November 2025, ChatGPT began honoring requests to avoid em dashes set in custom instructions.
My Simple Rule for You
Don't delete every dash out of fear. Cut the ones a comma could replace. Then add what bots can't fake: your own examples, numbers, and opinions. That's what readers remember.
Do you use AI tools to draft? Clear style instructions make a huge difference, and our prompt engineering guide for 2026 shows you how to write them.
FAQ: Em Dash Questions Answered
What is an em dash used for?
An em dash sets off an aside, marks an abrupt break, or adds emphasis. It can replace a comma, colon, or parentheses. Use it sparingly, about one pair per paragraph.
What is the difference between an em dash and an en dash?
An en dash is half as long and shows ranges, like 2020–2023. An em dash is twice that length and breaks or sets off a thought. A hyphen, shorter still, joins words.
Should I put spaces around an em dash?
It depends on your style guide. Chicago uses no spaces. AP uses a space on each side. For a blog, pick one style and apply it everywhere.
Does using an em dash mean AI wrote my text?
No. Pew's data shows em dash frequency rising on the web, but the mark alone is not proof of AI authorship. Humans have used it for centuries.
How do I type an em dash?
On Windows, hold Alt and type 0151 on the numeric keypad. On Mac, press Shift + Option + hyphen. In Word, type 2014 and press Alt + X.
Final Thoughts: Write With Confidence
The em dash is a flexible, human, centuries old tool. You now know how to use it, type it, and follow your style guide. You can also answer the AI question without sweating.
But knowing the rules is step one. Applying them in every post is where most people stall.
That's why I recommend [Your Product Name]. It takes the guesswork out of polishing your writing, so you spend less time second guessing punctuation and more time publishing work that sounds like you.