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Your Brief Asked for 6 Sizes. It Never Said What the Ad Should Say.

By the adzFIX team · · 3 min read

Short answerA useful ad brief fits on one page: who it's for, the one pain, the one promise, the proof, three hook ideas, what the ad will not say, the format, and what success looks like. Most briefs list deliverables instead of a decision, so designers decorate instead of persuade. Decide the message first; sizes come last.

Open the last brief your team sent to a designer. Count the lines about sizes, logos, brand colors and deadlines. Now count the lines about what the ad is supposed to make someone feel, believe or do.

For most brands the second number is zero or one. Something like “promote the spring offer” or “drive leads.” That's not a brief. That's a to-do list. And it's exactly why the designs come back pretty, on-brand and completely forgettable.

Why do most ad briefs produce weak ads?

Because the brief hands the hardest decision to the person with the least context. The designer doesn't know which customer matters most, which objection kills the sale, or what your sales team hears on every call. So they do what they can control: make it look good. A good-looking ad that says nothing is still an ad you pay for and nobody stops at.

A weak brief also invites the committee. When nobody decided what the ad says, everyone in the approval chain adds “just one more benefit.” The final version says everything, so it says nothing.

What goes into a one-page ad creative brief?

One-page ad brief template
  1. Who it's for: one person, in one situation, at one moment. Not “women 25–45.”
  2. The pain, in their words: the sentence they say to themselves when it hurts.
  3. The promise: what changes for them if they act now. One sentence.
  4. The proof: why they should believe it. Only real, approved proof.
  5. Three hook ideas: three different first seconds, not three color versions.
  6. What this ad will not say: every other benefit stays out.
  7. Format and placement: feed 4:5, story 9:16 or short video, and where it runs.
  8. The next step: exactly what happens after the click.
  9. Success metric: one number, such as cost per qualified lead, not “engagement.”

Notice line six. It's the hardest one to write and the one that saves the ad. If you can't name what the ad leaves out, you haven't made a decision yet.

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How do you know a brief is good before the designer starts?

  1. Read the pain line out loud. If a customer wouldn't say it that way, rewrite it.
  2. Cover the logo. Could a competitor run this exact brief? Then the promise is too generic.
  3. Check the hooks. If all three open the same way, you have one hook and two copies.
  4. Ask the designer one question: “What is this ad trying to make someone do?” If they hesitate, the brief failed, not the designer.

Who should write the brief?

Whoever owns the decision about what the ad says. Not necessarily the person ordering the work, and not the designer executing it. In a lot of companies that role simply doesn't exist, which is why briefs get written in a rush, copied from the last campaign or sent as a Slack message. If that sounds familiar, read who decides what's worth making and why testing two weak ads still gets you a weak ad.

Questions & answers

How long should an ad creative brief be?

One page. If it needs more, you probably haven't chosen one pain and one promise yet. Brand files, product photos and specs can be attached separately.

What's the difference between a creative brief and a design brief?

A design brief says how the ad should look and in which sizes. A creative brief says what the ad should say, to whom, and why anyone should stop. Without the second, the first produces good-looking ads that don't sell.

Can AI write the brief for me?

It can help you explore hook ideas and wording. The decision about who the ad talks to, which pain to lead with and what to leave out should come from someone who knows the business and its customers.

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One 60-minute session on Google Meet. We review your ads and pages before the call, then spend the hour on decisions. $630, no retainer.

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