Google Ads Quality Score dropped? How to find the change behind it

What does it mean when your Google Ads Quality Score drops?

A Quality Score drop means Google now rates your ad, keyword or landing page as less useful to searchers than other advertisers' for the same searches. It is a diagnostic signal on a 1–10 scale at keyword level, not a result in itself.

Google is explicit on three points that change how you read a drop:

• It is relative. Each component compares you with other advertisers whose ads showed for the exact same search over the last 90 days. A score can fall even when you changed nothing, because competitors improved.
• It is not an auction input. Google says Quality Score is not an input in the ad auction and is not a key performance indicator. Treat it as a pointer to where ad quality is weak, then check the metrics that matter: CTR, conversion rate, cost per conversion.
• Match type changes do not move it. The score is based on impressions for exact searches, so switching a keyword from phrase to broad does not change its Quality Score.

So a drop from 7 to 5 is worth investigating when it comes with a change in clicks or conversions, or when it hits many keywords at once. A single low-volume keyword moving one point is usually noise.

Which Quality Score component dropped?

Start with the components, because each one points to a different kind of change. Google rates each as "Above average", "Average" or "Below average".

If only one component changed status, you have already narrowed the search to one area of the account or the site. If all three moved together across many keywords, look at account-wide changes first: a restructure, a template change on the website, or a new competitor.

How do I see when the Quality Score changed?

Use the historical Quality Score columns and segment by day. That gives you a date, and a date is what lets you match the drop to a change.

1. In Google Ads, open Campaigns > Keywords.
2. Select the columns icon, open the Quality score section and add "Quality Score (hist.)", "Exp. CTR (hist.)", "Ad Relevance (hist.)" and "Landing Page Exper. (hist.)". Select Apply.
3. Pick a date range that covers a few weeks before and after the drop and apply the Day segment.

Google's announcement of these columns explains how they behave: over a date range they show the last known score, and with the Day segment they show what your scores were at the end of each day. Historical data is not available for dates before January 22, 2016. Where there are not enough impressions to calculate a score, you see a dash ("—").

Write down the first day each component changed status. That day, not the day someone noticed, is the anchor for the rest of the analysis.

What changes usually lower Quality Score?

Most drops trace back to an edit that made the ad, the keyword grouping or the page a worse match for the search. Google's own advice for each "Below average" component tells you where to look.

Expected CTR

• Ads rewritten with a less specific offer or a weaker call to action.
• The best-performing ad paused or replaced.
• Ad changes nobody on the team made by hand, such as auto-applied recommendations.

Ad relevance

• Keywords from different themes merged into one ad group, so one ad can no longer speak to all of them.
• New keywords added to an existing group without new ad copy.

Landing page experience

• A new final URL, a redirect or a page template change.
• A slower page or a broken mobile layout after a site release.
• Copy on the page that no longer matches the ad's message.

Landing page changes are the hardest to spot because they rarely show up in Google Ads at all. A website change log fills that gap. For the click side, see our post on why CTR drops.

How do I isolate which change caused the Quality Score drop?

Put every change from the 7–14 days before the drop date on one timeline, then test them against the component that fell. The cause is usually the change that touches the same keywords, the same ads or the same page, shortly before the first day of the new status.

1. Find the component that fell
2. Date the drop by day
3. Line up the changes before it
4. Match change to component
5. Test one fix at a time

Pull Google Ads edits from Google Ads change history, which covers the past two years. Then add what change history cannot see: website releases, landing page edits, tracking changes and new competitors you noticed in the same auctions. With every change on one timeline, a landing page experience drop that starts the day after a site release stops being a mystery. You can keep that timeline in a shared marketing change log, where Google Ads edits are imported and the team logs the rest.

Then rule things out one at a time. If ad relevance fell but no ads or ad groups changed, look at competitors. If landing page experience fell for every keyword pointing to one URL, the page is the suspect, not the keywords.

Example: A client asks: "Why did half our keywords drop to Quality Score 4 last week?" The historical columns show landing page experience moved to "Below average" on Wednesday for every keyword sending traffic to the pricing page. Lining up the changes shows the web team shipped a new pricing page template on Tuesday, with the plan names from the ads removed from the headline. Restoring the matching headline is the first fix to test. (Illustrative example.)

What should I fix first after a Quality Score drop?

Fix the change you found, on the component that fell, and leave the rest of the account alone until you see whether the score recovers. Changing several things at once makes the next diagnosis impossible.

• Expected CTR fell: restore or improve the ad that was working; make the offer specific and the call to action clear, as Google suggests.
• Ad relevance fell: split the ad group by theme or write ads that use the language of the new keywords.
• Landing page experience fell: make sure the page delivers what the ad promises, loads fast and works on mobile.

Judge the fix on CTR, conversion rate and cost per conversion as well as on Quality Score, because Google itself recommends reading the score alongside other metrics. Log the fix with its date, so the recovery (or the lack of one) can be read against it. If you need to explain the drop to a client, our guide on how to explain a conversion drop to a client shows how to present the timeline.

How do I stop the next Quality Score drop going unexplained?

Record every change with its date, owner and reason, across Google Ads and the website, before the next drop happens. When the score moves, you then compare dates instead of interviewing the team.

• Add the historical Quality Score columns to a saved keyword view so you can check them weekly.
• Log landing page and site releases next to ad changes, not in a separate tool nobody opens.
• Note automated changes, such as auto-applied recommendations, as they happen.

A marketing change log is the simplest way to keep that record in one place for every client.