What Is Invalid Traffic in Google Ad Manager?

Google defines invalid traffic as clicks or impressions that may artificially inflate an advertiser’s costs or a publisher’s earnings.

Invalid traffic can include intentionally fraudulent activity, but it can also include accidental clicks or impressions caused by problematic implementations.

Google monitors clicks and impressions using automated systems and human reviews to identify activity that does not represent genuine user interest. Publishers are still responsible for the quality of traffic associated with their inventory, including traffic generated by third parties.

Why Is Invalid Traffic Important for Publishers?

Invalid traffic can create problems for both advertisers and publishers. Advertisers may pay for interactions that do not represent genuine interest, while publishers may receive filtered traffic, revenue adjustments or restrictions on ad serving.

Google states that high levels of invalid traffic can result in account suspension or disabling. Google may also limit or disable ad serving when it cannot verify the quality of traffic associated with an account.

Common Types of Invalid Traffic in GAM

Invalid traffic can occur in several different ways. Understanding the common patterns can help Ad Operations teams identify potential problems earlier.

1. Clicking Your Own Ads

Publishers must not click their own Google-served advertisements. Google states that this prohibition applies even when the publisher is interested in the advertiser or wants to visit the destination URL.

Accidental clicks can happen. Google states that publishers do not need to contact Google every time an accidental click occurs, but intentionally clicking ads or repeatedly generating activity can create serious problems.

2. Repeated Clicks and Impressions

Repeated clicks or impressions generated by one or more users can contribute to invalid traffic when they artificially inflate advertising activity.

A publisher should therefore investigate unusual patterns rather than assuming that every increase in CTR or impressions represents genuine audience engagement.

Examples worth investigating include:

• Sudden increases in CTR without a corresponding change in user behavior.
• Large numbers of impressions generated by a small number of users.
• Unusual activity concentrated on specific URLs.
• Unexpected traffic from a small number of geographic regions.
• Traffic spikes that do not correspond to known marketing or content events.

3. Bots and Automated Traffic

Automated traffic can generate impressions or clicks without representing genuine user interest.

Google identifies automated clicking tools, robots and deceptive software as examples of invalid traffic.

Automated traffic can enter a publisher’s site through several routes, including malicious bots, compromised traffic sources, automated software and third-party traffic providers.

4. Encouraging Users to Click Ads

Publishers must not encourage users to click advertisements.

Click encouragement can take different forms, including language that asks users to interact with advertisements or page designs that create a high volume of accidental clicks.

Ad Operations teams should therefore review both the advertising code and the surrounding page design.

Things to check

• Are ads placed too close to navigation buttons?
• Can users accidentally click an ad while trying to close another element?
• Are ads positioned near download or play buttons?
• Does a sticky ad overlap interactive page elements?
• Does the page contain language encouraging ad interaction?

5. Purchased Traffic and Low-Quality Traffic Sources

Purchasing traffic is not automatically equivalent to invalid traffic. However, publishers need to understand where purchased traffic comes from and monitor its quality.

Google warns publishers to use caution when working with third-party traffic providers because some services may generate artificial traffic or incentivize users to visit pages or interact with ads.

Publishers are ultimately responsible for the traffic associated with their advertising inventory.

6. Invalid Traffic Generated by a Third Party

A publisher may sometimes receive invalid traffic without intentionally generating it.

Google acknowledges that third parties can generate invalid activity without the publisher’s knowledge or permission. However, Google also states that publishers are responsible for ensuring that traffic to their ads is valid.

This is why publishers should monitor traffic sources even when they do not directly control every source of incoming visitors.

Possible third-party sources to investigate

• Traffic acquisition partners.
• Website optimization services.
• Traffic exchanges.
• Paid-to-click or paid-to-surf programs.
• Unknown referral networks.
• Suspicious advertising campaigns.

How to Identify Possible Invalid Traffic

Google does not provide publishers with a simple dashboard that labels every individual visitor as valid or invalid. Instead, publishers should monitor traffic and advertising metrics for unusual patterns.

Google recommends using traffic segmentation and analytics to understand where visitors come from and how they interact with the site.

Use Google Analytics to Investigate Traffic

Google recommends using analytics to understand visitor behavior and traffic sources. For publishers, this can be useful when investigating unexpected changes in advertising activity.

Useful dimensions to review can include:

• Traffic source.
• Referral source.
• Geography.
• Device type.
• Landing page.
• Page views.
• Sessions.
• Engagement behavior.

Google also recommends segmenting traffic and advertising activity so that publishers can compare different sources and identify unusual behavior.

How Ad Manager Channels Can Help

Publishers using different traffic acquisition sources can segment their traffic and advertising activity to make investigation easier.

For example, a publisher could separate traffic associated with different acquisition campaigns or sources and compare their advertising performance.

This does not automatically determine whether traffic is valid or invalid, but it can make unusual changes easier to identify.

What Should You Do If You Suspect Invalid Traffic?

1. Identify when the unusual activity started.
   Compare the current traffic and ad metrics with historical performance.
2. Find the traffic source.
   Check analytics, referral sources, campaigns and traffic partners.
3. Segment the affected traffic.
   Break the data down by URL, device, geography, source and other useful dimensions.
4. Check the ad implementation.
   Look for accidental-click risks, unusual refresh behavior or recent changes to the page layout.
5. Pause suspicious traffic acquisition.
   If a third-party source appears responsible, stop or pause it while you investigate.
6. Remove ads from affected pages when appropriate.
   Google recommends removing ads while investigating suspected invalid activity in certain situations.
7. Continue monitoring.
   Watch traffic and ad metrics after the suspected source has been removed.

What Are Google Ad Manager Ad Serving Limits?

Google may place a limit on the number of ads an Ad Manager account can show. According to Google’s current documentation, an ad serving limit can occur while Google assesses traffic quality or because of invalid traffic concerns.

Limited ad serving applies to Google demand and third-party bidding ad sources. It does not affect third-party waterfall ad sources, house ads and direct-sold campaigns.

Google states that an invalid-traffic-related limit is automatically reviewed and updated as Google continues monitoring traffic quality.

How Long Can an Ad Serving Limit Last?

Google currently states that an ad serving limit typically affects publishers for less than 30 days, although it can take longer in some cases.

The duration depends on Google’s ongoing assessment of traffic quality and the circumstances of the account.

Can Invalid Traffic Cause Account Suspension?

Yes. Google states that high levels of invalid traffic can result in an account being suspended or disabled.

Google may also take further enforcement action if invalid activity or other policy issues continue to be detected.

Invalid Traffic vs Normal Traffic Fluctuations

A sudden increase in traffic, CTR or impressions does not automatically prove that invalid traffic is present.

Traffic can change legitimately because of a viral article, search ranking change, social-media exposure, marketing campaign, seasonal event or other audience behavior.

The important step is to investigate the source and behavior of the traffic before drawing conclusions.

How to Prevent Invalid Traffic in Google Ad Manager

Preventing invalid traffic is easier when traffic quality is monitored as part of normal publisher operations rather than only after an enforcement occurs.

• Monitor traffic sources regularly.
• Use analytics to understand visitor behavior.
• Segment traffic sources when possible.
• Avoid unreliable traffic providers.
• Do not click your own advertisements.
• Do not encourage users to click advertisements.
• Review ad placements for accidental-click risks.
• Investigate unusual traffic spikes.
• Monitor newly introduced traffic acquisition partners.
• Review unusual CTR or impression patterns.
• Investigate suspicious third-party traffic quickly.

Best Practices for Traffic Partners

If your website works with a traffic acquisition partner, do not evaluate the partner only by the number of visitors it delivers.

Also monitor the quality and behavior of those visitors.

What If You Believe Someone Is Sabotaging Your Ad Traffic?

Google recognizes that third parties can sometimes generate invalid traffic on a publisher’s advertisements without the publisher’s knowledge or permission.

This type of activity is sometimes described as ad traffic sabotage.

Even in such situations, publishers should investigate their traffic sources, protect their inventory and follow Google’s procedures for reporting suspected activity.

Google states that publishers remain responsible for ensuring that the activity on their advertisements is valid.

Invalid Traffic Checklist for Ad Operations Teams

Use this checklist when investigating a sudden traffic or ad-performance anomaly:

• ☐ When did the traffic change begin?
• ☐ Which URLs are affected?
• ☐ Which traffic sources are responsible?
• ☐ Is the traffic from a new partner?
• ☐ Are there unusual referral domains?
• ☐ Has the geographic distribution changed?
• ☐ Has device distribution changed?
• ☐ Has CTR changed significantly?
• ☐ Has impressions-per-session changed?
• ☐ Are users repeatedly interacting with ads?
• ☐ Could the page layout be creating accidental clicks?
• ☐ Are bots or automated systems involved?
• ☐ Should suspicious traffic acquisition be paused?
• ☐ Should ads be temporarily removed from affected pages?
• ☐ Is there an alert or enforcement in the Policy Center?

Frequently Asked Questions

Sources: This article is based on Google’s current Google Ad Manager documentation covering invalid traffic, traffic-quality prevention, ad serving limits, traffic acquisition and account enforcement.