When creating Facebook ads, most of the creative has to fit within certain limitations.
For example, the image has to be a set ratio and size, and if the headline, or the link description, are too long, they get cut off.
That leaves the ad text as the primary variable, as it can be just a single word or the equivalent of a short story.
As the ad text has so many possibilities, we get asked all the time at AdEspresso which length is best?
The AdEspresso motto is: Never assume anything. Always test everything. So we invested $1,000 of real ad spend to find the scientific answer.
And we discovered that the best length for your Facebook ad text is… (Keep reading to know!)
The aim of this experiment was to drive downloads of our Facebook Custom Audiences eBook:
When the book is downloaded it takes the user through to a thank you page where the lead pixel is fired.
We tracked the lead pixel and used this to measure our CPA, in this case, cost per lead.
Facebook Ad Copy Length Experiment: The Setup
Apart from the ad text, we tried to keep everything else as consistent as possible to reduce the effect of any other elements on the ad performance.
This means each ad used the same image, headline, link description and CTA button.
In details, the setup was:
- Audience: 1% US lookalike of customers, giving a total audience size of 2.1 million
- Budget: $1,000 over the course of 14 days
- Campaign structure: one ad per adset, meaning each ad was given the same budget
- Placements: desktop and mobile
- Optimization: conversions
We tested 7 different ad texts; each one was created by our resident blog writer Ana Gotter to ensure Top quality.
Here are the different versions, from long to short:
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One Sentence – Version A:
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One Sentence – Version B:
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Bullet Points:
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Bullet Points + Emojis:
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One Paragraph:
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Three Paragraphs:
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Six Paragraphs:
Facebook Ad Copy Length Experiment: Hypothesis
Rather than the AdEspresso team predicting the outcome we polled our customers in our AdEspresso University Facebook group, as well as asking our Hootsuite colleagues.
In total, we received 135 votes from this pool of experienced marketers and the prediction was that short ad text would give the lowest cost per lead.
Facebook Ad Copy Length Experiment: The Results
Each ad spent $142.90 (+/- $0.10) over the course of 14 days and produced the following results:
The trend that we observed is that the mid to long ad text produced the lowest CPA and the maximum number of leads.
When we simplified the ad text by keeping it to just one sentence or by breaking everything out using emojis, the CPA was significantly higher.
Next, we can look at the predictions from marketers:
Only 11% of votes were for the 3 best performing ads.
We’ll cover this in more detail in the conclusions section.
Here’s the overall campaign performance:
Note the high cost per click at $5 and relatively high CPM at $46.
However, as we covered in another $1000 Experiment: Which Facebook Campaign Optimization Type Works Best? Good quality traffic costs money.
In this case, it was worth the price, as it resulted in a 79% conversion rate which is over double what we see for many campaigns.
The cost per lead (blue line on the graph) was mostly stable but saw a considerable spike in cost on the 10th May.
We were unable to find a reason for this, but it demonstrates the importance of letting a campaign run for long enough to eliminate the effect of day to day random variation.
Facebook Ad Copy Length Experiment:Conclusions
The key points we discovered were:
- Poorly performing ad text costs 2.4 times per lead than the best version
This is a huge variation and could be the difference between ads being profitable and allowing budgets to be scaled and on the other hand having to pause advertising because it’s too expensive.
Keep in mind that ad text only has a minor effect on ad performance with the image or video and the headline having the most influence.
With a well-designed strategy to A/B test all elements of the ad creative over time, the potential cost savings are enormous.
Indeed we’ve seen accounts with a difference of up to 10 times in CPA from the initial campaign to when ads have been tested and refined.
- 89% of marketers voted for the 3 versions that performed the worst
After working in advertising or running a business for a while, it’s tempting to think that we know precisely what the audience wants.
This experiment proves that we actually get it wrong most of the time.
Keep an open mind and always be testing, also be sure to include a few “wildcard” options in your testing as these might surprise you and halve your CPA.
Why did the longer versions perform better?
It all depends on what your product is.
Some value propositions are obvious and can be conveyed in half a dozen words especially for well-known brands or items.
For something more complex, in this case, a guide to Facebook Custom Audiences, the user needs more information before they can assess its value.
The audience should also guide your ad creation process.
In this case, we were attracting a B2B audience which gets targeted with many different lead magnets, so they want extra information before deciding to take action.
Lead magnets aimed at a consumer audience, for example, a free recipe book, may need less explaining and the audience is easier to win over.
Final Thoughts
It’s worth keeping in mind that long-form ad copy only works if it’s written well.
In our case, we used a professional copywriter.
For many advertisers just starting out, it’s easier to produce short ad text or a series of bullet points, and this may convert better than poorly written longer text.
Many businesses might find good results by starting off with short ads and then using the feedback from these to get a specialist to create longer versions.
What do you think? Do you prefer to keep it long or cut it short? Will you experiment and share the results of your campaigns? What do you want us to experiment with next time?
thank you most attractive article! thanks for the information shared..
A great article indeed. Totally a convention buster.
Hi guys, interesting articles. BUT, the fact is I get the opposite results based on 30.000+€ ads/month budget. May I contact someone in your team to talk about a re-test this with some 1 phrase I should provide you ? If it works better, you get awesome content 😉 AND leads lower than for your current price. Open to discuss/plan here. Kind regards
Hi Bertrand, as we mention in the conclusions section the take home message isn’t that a certain text length always work best. Instead the conclusion is that ad text can make a huge difference to CPA so always test and find out what works best for your business, some products will require longer or shorter ad text.
Using AdEspresso would definitely make it easy to rapidly test and analyse the results, if you aren’t already a customer perhaps take out a free trial and see if you can find the perfect ad creative for your business.
Thanks for this awesome article. This experiment is really helpful for new users of facebook ads like me.
This is a great concept for an experiment but I can’t imagine why you wouldn’t keep the ad copy the same in each ad only adding more information for the longer versions.
For example the two versions of the one sentence ad have a strong “sales” vibe which is always a turn off while the one paragraph ad takes a much more informative article style approach. I hope at some point you redo this test. It is a great idea and I am still grateful for the insight. There was still something to learn. : )
Thanks for sharing all of your experiences!
Great insights about ad copy length. When promoting my blog posts and articles to get engagements, I always had confusion whether to write long 2-3 paragraphs or short 3 line ad copy?. after seeing those poll results that you have mentioned in the guide, I think maybe it is good to keep the ad copy length to one paragraph.
Tough call on copy length. All the more reason to test the ads!
We’ve had accounts where we implemented minor alterations, such as turning quotations from public relations into word art. And those ads have continued to perform well for more than two years. We’ve also had accounts where we retested a different variation with a storefront collection ad, with the video on the top and products beneath shuffling through dynamically from the product catalog, seeing great success. Both of those examples never would have panned out, had we given up after the first or even fifth try. But our persistence paid dividends for the client.
Please note, if you’re experimenting with a performance creative strategy, other people on your team (and even gurus who advise on best practices) might shoot your ideas down. Be prepared to use your grit to push through to the other side. Just because one person says your strategy won’t work, doesn’t mean it’s wrong. (Read our previous post on The Fallacy of Best Practices!)
Remember, failure is acceptable, and long as you bounce back and keep retesting new things. Besides, Facebook is constantly revamping their functionality anyway. What didn’t work last year or even six months might prove to be effective today.
We published a post about this if you’re up for more:
https://bit.ly/2w2jcn6
Hope that adds value for ya.
Never thought “Ad Copy Length” matters in Facebook Advertisement. And all this depends on the product you are promoting. Great article. Thanks for sharing.