AI Facebook Ad Copy Writer
On mobile the primary text folds at 125 characters. Everything you paid for lives in that window.
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A Facebook ad’s primary text collapses at about 125 characters on mobile, before the See more link, and most impressions are mobile. The hook, the benefit and the reason to stop scrolling all have to fit in that window. Copy that opens with the brand name or a paragraph of context spends its only visible line on something the viewer never asked for.
Use it for a single-image ad, a carousel, a video or a Stories placement. Say what the product does for one specific person, then give the offer. Format changes the length: Stories gets one line, carousel cards get a headline each. Paste the benefit as a sentence, not as a list of features.
What the facebook ad copy gives you
01Hook inside the first 125 characters
The opening names the problem in the reader’s words and fits above the fold, so the paid impression is not spent on a greeting. Alternative first lines are included because the hook is the variable most worth testing.
02One benefit, stated before the offer
A single claim, concrete enough to picture, arrives before the discount. Ads that lead with the offer attract bargain hunters, while ads that lead with the outcome attract people who will pay the full price for it.
03Format changes the length and shape
Stories gets one line because the viewer’s thumb is already moving. Carousel copy is written per card so each swipe has its own reason. Video copy is written to be heard, since most feeds start muted and captions carry the words.
04Written to be tested against creative
The copy assumes an image that already shows the product, so the words say what the picture cannot. Text and creative that repeat each other waste half the placement, and the test tells you nothing about either.
When to use it
Launch copy in an afternoon
Product description, ad variants, subject lines, meta copy — the same positioning restated for six surfaces. Write the positioning once, then let each surface get its own constraints.
Listings that can be found
Amazon, Etsy and Google all reward different things: backend keywords, tag budgets, character limits. The copy has to fit the field before it can rank in it.
Testing angles without a budget
Ten headline variants cost nothing to generate and a day to test. Most marketing writing is one angle repeated; generation is good at producing the alternatives you would not have thought of.
How it works
- 1
Name one person, not a segment
“Remote workers with back pain” is a segment. “Someone who bought a monitor arm and still slouches by 3pm” is a person, and the copy can talk to them.
- 2
Write the benefit as an outcome
Not “one-hand height adjustment” but “you can stand up mid-call without losing the sentence.” The feature justifies the outcome; the outcome is what stops the scroll.
- 3
Cut the first line into the headline
If the hook is doing the work, the headline can carry the offer instead of repeating the claim. Duplicate lines across the two fields are the most common waste in a feed ad.
Frequently asked questions
How long should Facebook ad copy be?
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Fifty to ninety words works for a feed ad, with the decisive part inside the first 125 characters. Long copy can work for high-consideration purchases, but only when the opening earns the See more tap. Stories needs one line, because the format gives you about two seconds.
What are the character limits?
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Primary text allows 125 characters before truncation on mobile. The headline shows about 40 characters and the link description about 30. Meta’s hard limits are higher, but the visible limits are what matter, since they decide what a person actually reads before tapping.
How many variations should I test?
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Three hooks against one body and one creative is enough to learn something. Changing the image, the copy and the audience at once tells you nothing. Let each version run long enough for the delivery system to exit the learning phase before judging it.
Should I use emoji in ads?
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Rarely, and never as a substitute for a headline. One emoji can break up a block of text in a feed, but it also reads as a small brand, which is the wrong signal for a premium product. Test it if you like, but test the hook first.
Can I use customer reviews as social proof?
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Yes, with a real review and a real name. Invented proof violates Meta’s policies and is easy for a reader to spot. A specific quote about the objection you are handling is worth more than a five-star badge, because it answers the question the buyer arrived with.
Should retargeting ads use different copy?
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Yes. Someone who already visited knows what the product is, so the ad should handle the objection rather than introduce the category. Repeat the benefit and answer the reason they left, such as price, shipping or fit. The same copy in both places wastes the second impression.
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