Writing and punctuation
WHAT IS AN
EM DASH?
An em dash is a long punctuation mark used to create a strong break in a sentence. Here is what it does, how it differs from other dashes and why I choose not to use it in my brand copy.
What is an em dash?
An em dash looks like this: —. It is a long horizontal punctuation mark. Writers use it to interrupt a sentence, add emphasis, insert an aside or replace commas, brackets or a colon. Its name comes from traditional typesetting, where the mark was approximately the width of a capital letter M.
What does an em dash do?
An em dash creates a stronger pause than a comma but does not necessarily end the sentence like a full stop. It tells the reader that the next phrase deserves particular attention.
Writers commonly use one to introduce an explanation, mark an interruption, add a sharp aside or create a deliberate change in rhythm. A pair can surround information in a similar way to brackets.
The em dash is a flexible punctuation mark for emphasis and interruption. It is useful, but it is not essential. Most sentences can be rewritten clearly with commas, brackets, colons or full stops.
Em dash versus en dash versus hyphen
Hyphen
A hyphen is the shortest of the three marks. It joins words or parts of words, as in well-written, small-business owner or thirty-five.
En dash
An en dash is longer than a hyphen and shorter than an em dash. It often represents a range, such as Monday to Friday or pages 10 to 18. Many style guides use the en dash between values, although writing the word “to” is often clearer online.
Em dash
The em dash is the longest mark. Its main job is rhetorical rather than mathematical. It changes the movement of the sentence and gives the inserted thought more force.
When should you use an em dash?
Use one when the interruption or reveal is part of the effect you want. It can make prose conversational, energetic and flexible. However, repeated use creates a recognisable rhythm. When nearly every paragraph contains one, the device stops feeling deliberate.
There is no universal rule saying every em dash needs spaces around it. British publishers and individual house styles differ. Consistency matters more than pretending there is only one correct visual treatment.
Why are em dashes suddenly everywhere?
They have been common in published writing for a long time. What has changed is how noticeable they have become online. Generative writing tools frequently produce sentences with explanatory asides, balanced clauses and emphatic turns. The em dash suits those patterns, so people have started treating it as a sign that copy was generated.
Can an em dash make writing look AI-generated?
It can create suspicion, particularly when it appears repeatedly alongside polished but generic language. Online readers now share lists of supposed AI giveaways, and the em dash is often near the top. That does not make the judgement accurate, but perception still matters.
A reader who suspects that a business pasted unedited AI copy may start questioning what else was produced without care. Were the claims checked? Does the writer understand the subject? Is the advice based on experience? Is a real person accountable for it? The punctuation mark does not cause the problem on its own. It can act as a trigger for a wider lack of trust.
Why does obvious AI copy reduce trust?
Customers do not necessarily object to businesses using useful technology. They object to feeling that nobody thought about them. Generic generated copy can suggest speed mattered more than accuracy, relevance or personality. When several businesses publish the same smooth sentence patterns, they also become harder to distinguish.
This matters most in services where judgement is part of the product. If a marketer, consultant or creative business cannot make its own writing feel considered, a potential client may reasonably wonder how carefully it will treat their brand.
An em dash does not prove that AI wrote the copy. Human writers use it and automated tools can avoid it. The stronger warning signs are generic claims, repetitive structure, unsupported certainty, invented facts and copy that could belong to any business.
Should brands ban em dashes?
Not automatically. A brand should decide whether the punctuation suits its voice and whether readers are likely to notice it for the wrong reason. The better rule is to edit generated material properly, verify every claim and make the writing specific enough that the source is recognisably you.
All Zilla No Filler copy does not use em dashes. That is a stylistic choice and a small trust signal. It helps the writing avoid a pattern many readers now associate with unedited AI copy. Clear punctuation should serve the voice, not become the voice.
Em dash examples and how to rewrite them
The examples below show the mark in context, followed by alternatives that preserve the meaning without relying on it.
1. Using an em dash for an explanation
The campaign had one clear objective — sell the remaining tickets.
The campaign had one clear objective: sell the remaining tickets.
2. Using an em dash for an interruption
The website looked professional — at least on a laptop — but was almost unusable on a phone.
The website looked professional (at least on a laptop) but was almost unusable on a phone.
3. Using an em dash for emphasis
There was one result the client needed — sales.
There was one result the client needed. Sales.
4. Using an em dash before a reveal
After weeks of testing, one subject line clearly won — the simplest one.
After weeks of testing, the simplest subject line was the clear winner.
5. Using an em dash to add an aside
Good marketing — when it is based on a real customer need — should make the buying decision easier.
Good marketing, when it is based on a real customer need, should make the buying decision easier.
None of the rewrites is automatically better. The choice changes the rhythm and emphasis. The point is to make the decision consciously rather than letting one punctuation pattern appear in every paragraph.
What can you use instead of an em dash?
- A full stop creates confidence and makes the next thought stand alone.
- A colon introduces an explanation, example or conclusion.
- Brackets keep an aside quieter and less dramatic.
- Commas work for light interruptions that do not need emphasis.
- A rewritten sentence is often the cleanest answer.
Good editing is not a hunt for one forbidden character. It is deciding what the reader needs, how the sentence should move and whether the punctuation helps.
Does punctuation affect brand voice?
Absolutely. Short sentences can feel decisive. Colons can feel organised. Brackets can feel conversational. Exclamation marks can add energy or exhaust the reader. Punctuation is part of tone of voice because it changes pace, emphasis and personality.
If your website sounds unlike your team, the problem may be deeper than a dash. A clear brand voice and copywriting approach should define vocabulary, sentence rhythm, humour, punctuation and what the business refuses to sound like.
Quick questions
FREQUENTLY
ASKED.
What is the keyboard shortcut for an em dash?
On Windows, shortcuts depend on the application and keyboard setup. In Microsoft Word, Ctrl + Alt + the minus key on the numeric keypad commonly inserts one. On a Mac, use Option + Shift + hyphen.
Is an em dash grammatically correct?
Yes. It is established punctuation with several accepted uses. The question is whether it improves the particular sentence and suits the chosen style.
Should there be spaces around an em dash?
Style guides differ. Some use closed em dashes without spaces, while others use spaced marks. Follow the house style consistently.
Does an em dash prove that text was written by AI?
No. Human writers have used it for centuries. It may be common in generated copy, but it is not evidence by itself.
Can I write well without em dashes?
Yes. Full stops, commas, colons, brackets and careful rewriting can perform the same jobs.