How Long Should Ad Copy Be? A Platform-by-Platform Guide
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Ad copy should be as long as it takes to make one clear point, and no longer, but every platform caps and truncates that point differently. The safe rule across all of them is to land the hook and the core benefit in the first line, because on every major network most people only read the visible portion before it is cut off. Here are the real limits and the lengths that tend to work, platform by platform.
If you would rather generate copy that already fits each platform's limits, an AI ad maker writes it to spec for Facebook, Instagram, TikTok, and Google in one pass, with variants to test.
The limits at a glance
| Platform | Field | Limit / visible | Best-practice length |
|---|---|---|---|
| Primary text | Truncates ~125 chars | 1 to 2 tight sentences | |
| Headline | ~40 chars shown | 5 to 7 words | |
| Caption | Truncates ~125 chars (2,200 max) | 1 to 2 sentences, hook first | |
| TikTok | Ad text / caption | ~100 chars visible | One punchy line |
| Google RSA | Headline | 30 chars | Fill all 30, no waste |
| Google RSA | Description | 90 chars | Use most of the 90 |
| Google Display | Short headline | 30 chars | Benefit in 30 |
Facebook and Instagram: front-load or lose the reader
Meta's placements share the same trap: the primary text or caption is cut behind "See more" or "more" after roughly 125 characters. You can write more, and sometimes a longer story-driven ad performs well for warm audiences, but the decision to keep reading happens in that first line. So write the hook and the benefit inside 125 characters, and treat anything after as optional detail for the minority who expand. Our guides to Facebook ad copy examples and Instagram ad copy examples show what strong short openers look like.
TikTok: shortest of all
TikTok copy is the tightest, because the viewer is half-watching and the caption shows only about 100 characters. One punchy, native-sounding line does the work. Long copy on TikTok reads as a pitch and gets skipped, so the discipline here is ruthless: a hook, a payoff, and a soft call to action, all in a sentence.
Google: use every character you are given
Google search ads flip the logic. A responsive search ad headline is capped at 30 characters and a description at 90, and here the goal is to use nearly all of that space, because unused characters are wasted real estate on a text-only ad. Write headlines that fill the 30 with a benefit or a keyword, and descriptions that use most of the 90 to add proof and a call to action. Our responsive search ad best practices guide goes deeper on filling an RSA well.
When short beats long, and when it does not
Short copy wins on cold audiences, mobile feeds, and any placement where attention is scarce, which is most of them. Longer copy can win when the audience is already warm, the product needs explanation, or the story itself is the sell, common in higher-consideration purchases. The mistake is defaulting to long everywhere. Start short, front-load the point, and only add length when you have a reason and the data to back it. Because the right length changes by placement, the practical move is to write several lengths and test, rather than argue about it in a doc.
If you are producing ads across all these platforms at once, doing the length math by hand for each one is the slow part. Writing to spec automatically, and getting variants to test, is what keeps a multi-platform campaign moving. It also helps to audit the landing page your ads point to, since a slow or cluttered page undoes a good hook no matter how tight the copy is.
Frequently asked questions
How long should Facebook ad copy be?
Keep the hook and core benefit inside the first 125 characters of the primary text, because Facebook truncates it behind "See more" there and most people never expand it. One to two tight sentences is a safe default. Longer, story-driven copy can work for warm audiences, but for cold traffic and mobile feeds, short and front-loaded almost always wins.
What is the ideal length for Google ad copy?
For a responsive search ad, use nearly all of the space you are given: fill the 30-character headlines and use most of the 90-character descriptions, since a text-only ad wastes any characters it leaves empty. Supply many distinct headlines and descriptions so Google has material to test. Unlike social copy, brevity is not the goal here; making full, non-repetitive use of the limits is.
Is shorter ad copy always better?
No. Short copy wins on cold audiences and attention-scarce feeds, which covers most placements, but longer copy can outperform when the audience is warm, the product needs explaining, or the story is the sell. The reliable approach is to start short and front-loaded, then test longer versions where you have a reason to believe added detail will help, rather than defaulting to one length everywhere.
How do I write ad copy that fits every platform's limit?
Write to the tightest visible limit for each placement: about 125 characters for Meta before truncation, roughly 100 for TikTok, and the strict 30 and 90 character caps for Google search. The efficient way is to generate copy that already respects each limit rather than hand-trimming, so you can produce a full multi-platform set and variants to test in one pass.
Write ad copy that fits every platform automatically. Adscreator turns a product URL into copy sized for Facebook, Instagram, TikTok, and Google, with on-brand images and variants to test. Make your ads.
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