Your PPC campaigns were driving steady conversions and solid ROAS. But recently, you logged into your dashboard to find your Cost Per Click (CPC) climbing and your Search Impression Share dropping. You haven’t changed your budgets, so what gives?
While there are several reasons this can happen, a common factor driving these changes is a dropping Google Ads Quality Score.
Google uses this metric to determine how relevant and useful your ads are to users. When it drops, you pay more for lower ad placements. In this post, we’ll look at the common reasons behind a declining Google Ads Quality Score and provide a framework to help improve your campaign’s health.
What Actually Makes Up Your Quality Score?
Google Ads Quality Score is calculated using three main factors: Expected Click-Through Rate (CTR), Ad Relevance, and Landing Page Experience.
Google doesn’t just pull a number out of thin air. Your Google ads quality score is a diagnostic tool (rated from 1 to 10) calculated using three specific, highly weighted metrics heavily rooted in historical performance:
Expected Click-Through Rate (CTR)
This is Google’s prediction of how likely a user is to click your ad when it’s shown for a specific keyword. It is heavily based on the historical performance of your keyword and ad copy, normalized for your ad position.
Ad Relevance
Ad relevance measures how closely your ad copy aligns with the user’s search query. If a user searches for “buy leather boots” and your ad talks about “discounted winter apparel,” your ad relevance will suffer. Google wants to see a direct thread between the search intent and your message.
Landing Page Experience
The journey doesn’t end at the click. Google evaluates post-click behavior to ensure you are sending users to a highly relevant, seamless, and useful webpage. Page speed, mobile-friendliness, usability, and direct relevance to the search query all play a massive role here.
- Quality Score vs. Ad Rank
It is crucial to understand that the 1-10 score in your dashboard is a historical diagnostic tool acting as a “check engine light.” It reflects how your keyword has performed for searches that exactly match the keyword, regardless of the keyword’s match type. However, Ad Rank is what actually decides your CPC and placement in the split-second of the auction. Ad Rank evaluates your bid amount, real-time quality factors (Expected CTR, Ad Relevance, and Landing Page Experience), and the expected impact of ad assets during the auction, independent of the 1-10 number.
5 Reasons Your Google Ads Quality Score Keeps Dropping
If you are watching your score slowly tick downwards, one (or a combination) of these five common pitfalls is likely to blame.
1. Your Ad Copy Has Gone “Stale” (CTR Decline)
Even the best ad copy suffers from “ad fatigue” over time. If your ads have been running untouched for months, users may have grown blind to them. More importantly, if your competitors frequently update their copy with fresh, compelling offers and you don’t, your click-through rate will drop by comparison, dragging your Google ads quality score down with it.
2. Shifts in User Search Intent
The way people search, and what they expect to find, evolves. A keyword that used to trigger primarily transactional searches might slowly shift toward informational intent. If searchers are suddenly looking for “how to fix” guides, but your ad strictly pushes a “buy now” service, your ad relevance will plummet.
3. Landing Page Neglect
You might be constantly tweaking your ads while ignoring the destination URL. Landing page decay is a silent killer of your Google ads quality score. Over time, heavy image uploads might slow down your page speed, mobile formats might break after a site update, or broken links might cause high bounce rates. Google’s crawlers will notice this friction.
4. Broad Match Keyword Chaos
Using Broad Match without rigorous negative keyword management can quickly lead to wasted spend on irrelevant queries.Broad match allows Google to show your ads for loosely related synonyms and variations. If your ads are triggering thousands of irrelevant queries, users won’t click them. This destroys your Expected CTR and Ad Relevance simultaneously.
5. Increased Competitor Aggressiveness
Sometimes, a dropping score isn’t entirely your fault. The PPC auction is a zero-sum game. If new, aggressive competitors enter your auction with highly optimized campaigns, better landing pages, and irresistible ad copy, they will steal the clicks. By comparison, your Expected CTR drops, signaling to Google that your ad is no longer the best result.
How to Stop the Drop and Improve Your Quality Score
A dropping Google ads quality score is a symptom, not a permanent disease. Here is how you can actively reverse the trend and optimize your campaigns:
- Audit Your Search Terms Report:
Make this a weekly habit. Dig into the actual queries triggering your ads. Actively add irrelevant or low-performing queries to your Negative Keywords list to immediately tighten up your ad relevance and protect your CTR. - Implement STAGs (Single Theme Ad Groups):
Because of how aggressive Google’s “close variants” have become, Single Keyword Ad Groups (SKAGs) are largely dead. Instead, build STAGs by grouping your keywords tightly by user search intent so you can write hyper-specific copy. - Optimize Responsive Search Ads (RSAs):
The days of A/B testing entirely separate ads are over. With RSAs as the modern default, focus on evaluating asset performance within a single ad. Review your dashboard labels and actively replace headlines or descriptions marked as “Low” performing. - Utilize Ad Assets (formerly Ad Extensions):
Ensure you have at least 4 sitelinks, callouts, and image assets active on your campaigns. These elements improve your ad’s visibility and can lift your actual click-through rate over time, which supports a healthier Quality Score. - Optimize the Landing Page: Ensure your landing page delivers exactly what the ad promised. The H1 tag on your page should closely mirror your ad’s headline. Furthermore, run your page through Google’s PageSpeed Insights and fix Core Web Vitals to guarantee a frictionless mobile experience.
Conclusion
Your Google ads quality score is not a “set-it-and-forget-it” metric; it is a live reflection of your campaign’s health in a highly competitive auction. By understanding the three core pillars, Expected CTR, Ad Relevance, and Landing Page Experience, and vigilantly guarding against stale copy, keyword bloat, and landing page decay, you can keep your CPCs low, your ad ranks high, and recover your lost Search Impression Share.
Ready to stop overpaying for clicks? Set aside some time this week to audit your lowest-performing ad groups, clean up your search terms, and refresh your ad copy.
Frequently Asked Questions
- Q: Does changing my bidding strategy affect my Quality Score?
A: No, your bidding strategy (like switching from Manual CPC to Target CPA) does not directly impact your Quality Score. Quality Score is purely a measure of relevance and user experience. However, a new bid strategy might change where your ad appears, which can indirectly affect your actual CTR, but Google normalizes expected CTR for ad position. - Q: How often does Google update my Quality Score?
A: The 1-10 metric you see in your dashboard is a historical aggregate based on searches that exactly match the keyword and is recalculated regularly, though changes may take time to appear in the interface. However, the actual quality factors (Expected CTR, Ad Relevance, and Landing Page Experience) are evaluated dynamically in real-time during every single auction to determine your Ad Rank. - Q: Is a 5/10 Quality Score bad for my campaign?
A: A 5/10 is considered below average. While it won’t stop your ads from running, it means you are likely paying a higher CPC. A higher Quality Score indicates your ad is highly relevant, which Google rewards with higher Ad Rank and lower CPCs. Aim for at least a 7/10 for optimal cost-efficiency. - Q: Can pausing an ad group lower its Quality Score when reactivated?
A: Pausing an ad group freezes its historical data; it does not actively lower the score. However, if you leave it paused for a long time and reactivate it, the competitive landscape and user search intent may have changed. This can lead to a quick drop in Quality Score once the ad starts accumulating new, potentially less relevant, data.
Pro Tip: Base Decisions on Revenue, Not Just Quality Score
Quality Score is a helpful performance indicator, but it should not override your core business objectives. Advertisers often focus too heavily on achieving a perfect 10/10 score rather than looking at their actual return on investment.
If a keyword has a lower score, such as a 5/10 but consistently drives sales at your target cost, you should keep it active. Quality Score primarily measures how relevant your ad is to a specific search. While it is a useful metric for finding ways to optimize your campaigns, your actual revenue and conversion costs should always dictate your final strategy.