The quickest way to find underperforming ad creatives is to stop looking at the account total and line the ads up against each other. Same ad group, same audience, same dates. In many accounts we audit, one or two ads are carrying the results and the rest are spending money to look busy. The average hides them.
This is the order we read the numbers in, what each one tells you about the copy or the image, and the tests we run once the weak ad is found.
Key Takeaways
- Judge an ad against its neighbours in the same ad group or ad set. Account averages blur the one ad that is dragging results down.
- Low CTR points at the creative or the targeting. Good CTR with weak conversions points at the landing page, the offer or the tracking.
- Ad fatigue shows up as falling CTR, rising frequency and rising cost per result on an audience that has stopped growing.
- Google Ads Help calls Quality Score a diagnostic, not an auction input. Use its three components to locate the problem.
- Change one element per test and leave both versions alone until the test ends.
Read the metrics in this order
Most owners open the dashboard and look at spend and conversions. Those two numbers tell you whether there is a problem. They do not tell you where it is. For that you need the chain from impression to sale, read left to right.
| Metric | What a bad number usually means | Creative or not? | What we check next |
|---|---|---|---|
| Click-through rate (CTR) | People saw the ad and found no reason to click | Usually creative, sometimes targeting | Headline against the search terms; first line and image on social |
| Conversion rate | The click happened but the visit went nowhere | Usually the page or offer | Message match, phone load speed, form length, tracking |
| Cost per click | You pay more than competitors to hold position | Partly creative (ad quality) | Quality Score components, auction insights |
| Cost per conversion | The whole chain is leaking somewhere | Depends on which step breaks | Work back through CTR and conversion rate |
| Frequency (social) | The same people see the ad too often | Creative wear-out | CTR trend over the same weeks |
| Return on ad spend | Revenue does not cover the media | Rarely the creative alone | Offer, price, follow-up speed |
The point of the order is to avoid rewriting good ads. We have seen owners pause their best search ad because cost per conversion went up, when the real cause was a contact form that stopped sending emails.
Click-through rate: the first test of the copy and the image
CTR is the cleanest signal you get about a creative, because it measures one decision: did this person want to know more? On search, a weak CTR almost always comes from a headline that does not echo the search. Someone types "emergency plumber near me" and sees "Quality Plumbing Solutions Since 1998". The ad is about you. The search was about a leak.
On Meta, YouTube and display, the decision happens in the first second. The image either stops the thumb or it doesn't. Text-heavy graphics, stock photos of handshakes and logos in the middle of the frame all lose here.
Before you rewrite anything, check who is seeing the ad. A strong ad shown to the wrong audience gets a poor CTR too. If the search terms report is full of job seekers or people looking for free versions, fix the keywords first. Our piece on why cost per click runs high walks through that cleanup.
Conversion rate: when the ad works and the page doesn't
A healthy CTR with a weak conversion rate is good news about the creative. People liked the promise. Then something on the landing page broke it. The usual suspects are a page that repeats none of the ad's wording, a form with too many fields, a slow load on a phone, or a page that sends a paid click to the homepage.
Tracking belongs on this list too. On California Employer Attorney's Google Ads account we track completed forms and phone-call leads as separate conversions: 363 forms and 169 call leads across September 2025 to August 2026. If only one of those were tracked, roughly a third or two thirds of the leads would vanish from the report, and perfectly good ads would look like they failed.
Cost per click and Quality Score: what Google thinks of the ad
On Google Search, poor ad quality makes every click more expensive, because you need a higher bid to keep your position. Quality Score gives you a rough read on that. It is scored 1 to 10 at keyword level, built from three components: expected CTR, ad relevance and landing page experience. Each is rated above average, average or below average against other advertisers on the same searches over the last 90 days.
Quality Score is a diagnostic tool meant to give you a sense of how well your ad quality compares to other advertisers.
Google Ads Help, About Quality Score for Search campaigns
Treat the components as a map. Below average ad relevance means the ad does not match the keywords in the group, so split the group or rewrite the headlines. Below average expected CTR is a creative problem. Below average landing page experience sends you to the page, not the ad.
Ad fatigue: the slow way a good ad goes bad
Every creative wears out on a fixed audience. On social platforms you can watch it happen. Frequency rises, CTR slides a little each week, and cost per result climbs. The ad did not get worse. The audience got tired of it.
Search ads fatigue more slowly because new people search every day, but they still date. Seasonal offers, old prices and "new for 2025" headlines sitting in a 2026 account all count.
The fix is a new angle, not a new colour. Change the opening claim, the image subject or the format (a short video in place of a still). Keep the old ad running at lower spend until the new one proves itself.
Signs your visuals are the weak link
When the copy tests well on search but the same message flops on Meta or display, the visual is usually the cause. We look for four things in the creative itself:
- The subject is hard to read at phone size, or there is no single subject.
- Text is baked into the image and repeats the caption word for word.
- The image could belong to any business in the category.
- The first three seconds of a video show a logo instead of the problem.
Real photos of your work, your team or your customers' results tend to beat polished stock. That is our experience across small-business accounts, and it is easy to test: run the stock version against a real photo for a few weeks and compare CTR.
How we test a replacement
Once a weak ad is found, we write two or three replacements that each change one thing: the headline claim, the offer, or the image. Then we test them against the current leader, not against the loser.
In Google Ads, custom experiments split a campaign's traffic and budget between the original and a changed version, so you can compare them over the same period. Google's own guidance warns that changing either side mid-test makes the result harder to read, which matches what we see. For responsive search ads, Google suggests at least two ads per ad group rated Good or Excellent for Ad Strength. It reports that advertisers who move Ad Strength from Poor to Excellent see 15% more conversions on average, though Ad Strength itself does not decide whether an ad serves (Google Ads Help, About Ad Strength).
Small accounts need patience here. A test that ends after 40 clicks has told you very little. We would rather run one clean test a month than four noisy ones.
Common reasons ads underperform
Most weak creatives trace back to a short list. Targeting that is too broad puts a decent ad in front of people who will never buy. One ad group covering five services forces generic copy. A creative that has run untouched for a year has fatigued. And an offer that matches every competitor ("free estimates", "quality service") gives nobody a reason to pick you.
The fixes differ, which is why the diagnosis comes first. If you want a second pair of eyes on an account, our paid ads management team starts every engagement with this exact read of the numbers, and you can book a free audit to see it on your own ads.
A weekly check that catches problems early
You do not need a dashboard full of charts. Once a week, sort each ad group by CTR and by conversion rate, look at frequency on social campaigns, and note any ad whose CTR has fallen three weeks in a row. Ten minutes catches most problems before they cost a month of budget. Write down what you changed and when, so the next dip has an explanation.
The Google Ads experiments guide covers the setup steps if you want to formalise the tests.
Frequently Asked Questions
How do I find underperforming ad creatives?
Compare each ad against the other ads in the same ad group or ad set, on the same audience and dates. Sort by click-through rate first, then by conversion rate. An ad that trails its neighbours on both, with enough impressions to judge, is the weak creative. An ad with a good CTR and a poor conversion rate usually points at the landing page or the offer.
What does a low CTR say about my ad creative?
It says people saw the ad and did not find a reason to click. On search that usually means the headline does not repeat what they typed or the offer is vague. On social and display it usually means the image or the first line did not stop the scroll. Check targeting before rewriting, because a good ad shown to the wrong people also gets a low CTR.
What are the first signs of ad fatigue?
CTR falls week over week while frequency climbs and the audience stays the same size. Cost per result rises soon after. On Meta you will often see comments thin out or turn negative. Those signs together mean the same people have seen the ad too often, and a new angle or image is due.
How do I know if the ad or the landing page is the problem?
Look at where the drop happens. A low CTR is an ad problem. A healthy CTR with a low conversion rate is usually a landing page, offer or tracking problem. Check that the page loads fast on a phone, repeats the promise in the ad, and that the conversion action actually fires before you blame the creative.
How long should I run an ad test before deciding?
Long enough for both versions to collect a meaningful number of clicks and conversions, which for most small accounts means several weeks, not several days. Change one thing at a time and avoid editing either version while the test runs, because Google Ads Help warns that mid-test changes make results harder to read.
Does Ad Strength tell me which ad is underperforming?
Not directly. Ad Strength rates how complete and varied a responsive search ad is before it runs, and Google says it does not directly affect serving eligibility. It is a useful checklist when you write the ad. To judge performance after launch, compare CTR, conversion rate and cost per conversion between ads.
