Ad Preview & Diagnosis Tool: Why Your Ad Is Not Showing in 2026

You have set up a campaign, the budget is ready, the ads are approved, and yet when you search for the keyword you are paying for, your ad is nowhere to be found. Sound familiar? The Ad Preview & Diagnosis tool in Google Ads is built exactly for this situation. Available directly within your Google Ads account, this tool lets you simulate a search query and check whether a specific ad is eligible to show for a given keyword, location, language and device type. It does not just give you a yes or no answer, but also a concrete diagnosis explaining why your ad may not be appearing. In this article we explain how the tool works, what the most common causes of non-showing ads are, and how AdBrains uses its own AI technology to automate this diagnostic process structurally, so visibility issues never go unnoticed.

What is the Ad Preview & Diagnosis tool?

The Ad Preview & Diagnosis tool is a built-in feature within Google Ads that lets you run a simulated search. You enter a search term, choose a location, language and device type, and the tool shows which ads would appear in the auction at that moment, including whether your own ad is among them. The major advantage over simply searching on Google yourself is that the tool does not trigger a real search query. This means no impression is counted, your own click behaviour does not affect your Quality Score, and your account is not influenced by your personal search history or your device's location settings.

The tool is accessible via the Google Ads menu under "Tools and Settings" and is available for Search campaigns as well as certain types of display campaigns. Advertisers who regularly monitor campaigns use the Ad Preview & Diagnosis tool as a quick check during suspicious performance dips or when launching new ad groups. At the same time, the tool is reactive by nature. You have to actively go looking for the problem. This is precisely where an automated approach makes all the difference.

The five most common reasons ads are not showing

When the tool indicates that your ad is not showing, it always connects this to a specific cause. These causes fall into five main categories, each with its own recommended action. It is important to treat the diagnosis not as an error message, but as an action plan.

• Budget exhausted or bid too low: The daily budget has run out, or the maximum CPC bid is too low to compete in the auction. When Smart Bidding strategies such as Target CPA or Target ROAS are in use, an overly strict target can also cause the campaign to limit itself within the auction.
• Low Ad Rank due to poor Quality Score: Ad Rank is determined not only by the bid, but also by Quality Score, a composite score based on expected CTR, ad relevance, and landing page quality. A low Quality Score means you need a higher bid for the same position, or you simply drop out of the auction.
• Search term outside the match type: If your keyword is set to exact match for a specific phrase, your ad will not show for a closely related but differently worded query. The Ad Preview & Diagnosis tool makes it immediately clear whether the entered search term matches any of your keywords.
• Negative keyword conflicts: A negative keyword set too broadly can accidentally block relevant queries. This is one of the hardest problems to detect manually, because a negative keyword at campaign or account level works silently without a visible error in the campaign interface.
• Targeting restrictions (location, time, device): If your campaign is set to specific regions, certain times of day, or only desktop devices, your ad will not appear outside those parameters. The tool lets you simulate whether the combination of location, time and device you enter matches your campaign's targeting settings.

For local businesses like Clima-Active.nl, which installs air conditioning and heat pumps in a specific service area and uses strict geo-targeting, checking the location parameter in the tool is particularly important. A small difference in how targeting is defined, for instance "people living in a region" versus "people currently in a region", can lead to completely different visibility outcomes.

How to use the Ad Preview & Diagnosis tool: a practical step-by-step guide

Here is a practical step-by-step guide to getting the most out of the tool:

1. In your Google Ads account, go to "Tools and Settings" and select "Ad Preview and Diagnosis" under the Planning section.
2. Enter the exact search term you want to check your ad for.
3. Set the location to match your campaign's target region.
4. Choose the correct language and device type (mobile, desktop or tablet).
5. Click "Search" and review the results: is your ad showing, and if not, what diagnosis does the tool provide?
6. Note the specific message and link it to the relevant campaign, ad group or keyword for further action.
7. Repeat the check for your most critical keywords, especially those with high CPC or strategic importance.

Keep in mind that the tool provides a snapshot in time. Your ad may not be showing at one moment because the daily budget is exhausted, and show an hour later once the budget resets. Use the tool preferably early in the day or immediately after a campaign change to get a representative picture.

Common interpretation mistakes

Advertisers using the Ad Preview & Diagnosis tool for the first time sometimes make mistakes when interpreting the results. Here are the most frequent misunderstandings:

• Searching on Google yourself as an alternative: If you search on Google for your own keyword, Google quickly learns you are unlikely to click. Over time this negatively affects your expected CTR and Quality Score. Always use the official tool.
• Treating "not showing" as a technical defect: Many advertisers assume their ad is broken, when the issue is simply a budget or match type conflict. The diagnosis is the starting point, not the end point.
• Running a one-off check: Campaign performance changes daily. A single check provides insufficient insight. Structural monitoring is required.
• Entering the wrong location: If your campaign targets Rotterdam but you test the tool with Amsterdam as the location, you will naturally get a not-showing result. Always simulate the correct region.

How AdBrains AI automates and structurally improves the diagnostic process

The Ad Preview & Diagnosis tool is a powerful instrument, but it has one fundamental limitation: it works on demand. You have to actively search, enter a query, select a location and interpret the result. For campaigns with dozens of ad groups and hundreds of keywords, it is impossible to monitor this manually. Moreover, the tool only flags a problem after you go looking for it, while impression share gradually declines in the meantime.

AdBrains has developed a fundamentally different approach. Our proprietary AI technology performs an automated daily scan across all signals related to ad visibility, without an account manager needing to initiate this manually. This starts with the multi-agent verification system: four independent AI agents analyse every campaign for deviating impression patterns, budget exhaustion signals and match type inconsistencies. Every finding is verified by at least two agents before any action or alert is triggered, preventing false positives.

For negative keyword conflicts specifically, AdBrains deploys automated search term mining. Every day, all search terms entering via broad match or phrase match are analysed, and the system automatically detects when an existing negative keyword is blocking a relevant query. This is exactly the kind of conflict that at ToetsJeKennis.nl was previously discovered manually via the Ad Preview & Diagnosis tool, but that with AdBrains AI is detected proactively on a daily basis.

The RSA improvement system links Ad Strength scores directly to visibility signals. When a Responsive Search Ad has a POOR Ad Strength status, Google is more likely to show it less frequently, even if the bid and budget are sufficient. Our system automatically rewrites ad copy with low Ad Strength, improving Quality Score and increasing the frequency with which ads qualify for the auction. For clients like E-4motion.com, which works with specific product search terms for new electric folding bikes, this means every RSA is continuously optimised for maximum visibility.

The strategy-switch system monitors the interaction between Smart Bidding and impression volume. If a Target ROAS or Target CPA campaign generates too few conversions to give the bidding algorithm sufficient data, our system automatically pauses the campaign and switches to a safer bidding strategy, until conversion data volume recovers. This prevents the situation where an ad is technically active but rarely shown in practice due to an underfed Smart Bidding algorithm.

Overview: causes, signals and solutions

The table below provides a structured overview of the most common reasons ads do not show, the corresponding signal in the Ad Preview & Diagnosis tool, and the recommended solution:

This overview covers the cases that account for more than 95% of diagnoses in practice. Use it as a quick reference whenever you receive a diagnosis result from the tool.

FAQ: Ad Preview & Diagnosis tool

Why is my ad not showing even though everything seems correct?

This is one of the most frequently asked questions, and the answer often lies in a combination of factors that each seem acceptable individually but together result in a non-showing ad. Think of a correctly set budget that has nonetheless run out due to heavy competition in the morning, combined with a Quality Score that is just slightly too low to win the auction with the available bid. The Ad Preview & Diagnosis tool shows you the exact combination. Also always check whether the campaign is active, whether the ad group is not paused, and whether the ad itself is approved. Sometimes the issue is simply a status setting that has been overlooked.

Can I use the Ad Preview & Diagnosis tool for Performance Max campaigns?

The tool is primarily designed for Search campaigns and has limited functionality for Performance Max. PMax campaigns span multiple channels (Search, Display, YouTube, Gmail, Maps) and the tool cannot provide a complete picture of the impression decisions across all these channels simultaneously. For PMax campaigns, it is better to consult the insight reports within the campaign and monitor impression share. For Search campaigns, the Ad Preview & Diagnosis tool remains the most direct and reliable diagnostic check available.

Does using the tool affect my campaign performance?

No. This is precisely the key advantage of the Ad Preview & Diagnosis tool over searching on Google yourself. The tool simulates a search query without generating a real impression. Your click behaviour, search behaviour and device settings have no influence on the results. Your Quality Score is not affected, and no costs are incurred. It is a completely safe way to check whether your ad is visible to your target audience, without contaminating your own campaign data.

How often should I use the Ad Preview & Diagnosis tool?

For campaigns with a limited budget or in competitive markets, it is advisable to use the tool at least weekly for your most strategically important keywords. When launching new campaigns or after making significant changes, such as adjusting match types, adding negative keywords or modifying geo-targeting, an immediate check via the tool is a smart move. Keep in mind, however, that manual checks are always snapshots. Structural monitoring, such as that provided by AdBrains AI, gives a more reliable and continuous view of the visibility status of all your ads across all campaigns simultaneously.