Does an em dash mean AI wrote it?
Last updated 24 October 2026
No. People were writing em dashes for centuries before any model existed, and models use them because they learned to write from people who do. A punctuation mark is a habit, and a habit cannot tell you who was at the keyboard. Keep yours.
Why do people think it’s a sign of AI?
Chatbots use em dashes a lot, so readers started noticing them in text they suspected was generated, and the mark became shorthand for the whole suspicion. The writer Robert Roy Britt traces it in AI’s Assault on the Em Dash Should Worry All Writers: models trained on human writing full of em dashes, reproduced them freely, and the mark came to be read as a tell, to the point that, by his account, some writers and editors now avoid it.
The em dash itself is old and ordinary. Emily Dickinson’s poems are full of dashes. Style guides have argued over it for as long as there have been style guides, the way they argue over the Oxford comma.
Can a punctuation mark tell you who wrote something?
No. A habit shared by millions of human writers, and copied by models from them, is in both kinds of text. Seeing it in a piece tells you the writer likes em dashes. The same goes for the other supposed tells: a tidy list of three, a word like “delve”, a neat closing line. Each is something people did first.
AI detectors do not settle it either. They estimate how much a whole text resembles a model’s writing, and they flag human writing too, especially clear, edited prose. Why detectors flag human writing.
Should I stop using em dashes?
Not to avoid suspicion. Writers have written about doing exactly that, and about what it costs them:
- Yamuna Ramachandran wrote about taking the em dash back after changing how she wrote to avoid being doubted.
- J. M. Elliott wrote about the fear that writers will narrow their own style so they aren’t branded fake.
My Em Dashes Are Real — and They’re Spectacular, The Progressive Primer, May 2025; The Controversial Em Dash, January 2026.
Editing your style to please a guess hands the guess your voice, and it does not work: a reader who has decided you used AI will find another tell. Use the em dash where it is the right mark, and cut it where it is not, for the same reasons you always would.
Then how do I show I wrote it?
With evidence of how the piece was written, not with its punctuation. A version history, drafts and notes are evidence; so is a record kept as you write, which a reader can open from the piece itself. iwrote keeps one: you write in the browser, it records how the words arrive, and you put a short link under the piece that shows readers how it was written, em dashes and all.
Every way to show your writing is human, compared, or start writing on iwrote.