Google Ads · No. 28
Google Ads conversion drop monitoring
In short
A Google Ads conversion drop is when ads bring in as many visitors as before, but reports show far fewer leads, calls or sales. It may be your website (a broken form or cart), your tracking (a missing tag, changed conversion settings) or the campaign itself losing effectiveness. Automated bidding then learns from bad data, so find the cause fast.
Contents
What is a Google Ads conversion drop?
A conversion is an action by a visitor that you consider valuable: a lead form, a call, a purchase, a sign-up. Google Ads counts conversions through a tag on your website or by importing them from other systems, and shows them next to your clicks and costs. A conversion drop is a noticeable decline in the number or value of conversions over a period — especially when the number of clicks stays the same.
“Clicks steady, conversions down” means visitors are still reaching your website but are turning into customers less and less often. The cause may be your website or your conversion tracking — or the ads themselves: the campaign has lost effectiveness and is bringing in less relevant visitors. To figure it out, you need to know what each column shows:
| Google Ads column | What it shows |
|---|---|
| Conversions | Conversions from primary conversion actions; these are what automated bid strategies optimize for |
| All conv. | Primary and secondary conversion actions, plus conversions from other sources, such as view-through conversions |
| Conv. value | The total value (in money) of the conversions in the “Conversions” column |
| Conv. rate | Conversions divided by the number of ad interactions |
| Cost / conv. | Total cost divided by the number of conversions |
Google Ads Help explains the difference between primary and secondary actions like this: secondary actions “are for observation only” and are “used for reporting in the ‘All conversions’ column,” while primary actions are “reported in the ‘Conversions’ column in your reports and used for bidding” (source).
Why monitor conversion drops?
The first reason is obvious: if your form or checkout breaks, you’re paying for clicks that can no longer become customers. Every day it stays broken means wasted budget and lost leads.
The second reason is less visible: automated bid strategies optimize for conversions. If the tag stops firing, the system “sees” that your ads aren’t bringing in anything and adjusts your bids. Google says this directly:
“If there’s a sudden drop or increase in global pings or tag fires for a conversion action that your campaign is using for Autobidding, this can result in a drop in serving and spending as Google Ads optimizes towards your set conversion action.”
In other words, a tracking failure doesn’t just spoil your reports — it makes the ads themselves worse: the campaign may cut back on serving exactly when demand hasn’t changed.
The third reason is conversion value. For an online store, it’s not just the number of orders that matters but their total. Conversion value is the amount of money the tag sends along with each conversion. If it stops being sent, a fallback value kicks in:
“If you don’t add this code, the default value you enter will be used for all conversions.”
As a result, the number of orders in your report may stay the same while the value drops sharply — and strategies that optimize for value get a false signal.
Why do Google Ads conversions drop?
The cause can be your website, your conversion tracking or the ad campaign itself. The most common ones:
- A broken form or cart. After a theme, plugin or payment module update, the form won’t submit, a button doesn’t respond on mobile, or checkout throws an error. Conversions drop because customers really can’t get through.
- The tag is gone or changed. During a redesign, someone removed the Google Tag Manager code or the Google tag, changed the URL of the thank-you page that triggered the conversion, or renamed an event. The customers are there, but Google Ads can’t see them.
- Consent mode and the cookie banner. Consent mode tells Google whether a visitor accepted cookies. In basic mode, according to Google Ads Help, “when the user doesn’t consent, no data is transferred to Google at all, not even the consent status” (source). A new banner or different consent settings can noticeably reduce the number of conversions recorded.
- Conversion action settings changed. The action was switched from primary to secondary and disappeared from the “Conversions” column. Or someone changed the “Count” setting: with “One,” “Google Ads counts only one conversion per ad click” (source).
- Reporting lag. The main conversion columns are calculated by the time of the click, not the time of the conversion, and reporting lags can take up to 24–48 hours (Google Ads Help). The last few days in a report almost always look worse than they really are.
- The campaign lost effectiveness. You’re getting as many clicks, but they’re lower quality. Competitors raised their bids or changed their offer, and your campaign slipped to less favorable positions; Google Ads Help lists the choices of other advertisers in the same auctions among the factors that affect performance (source). After changes to a campaign, the automated bid strategy relearns, and Google notes that Smart Bidding is “always training on new data to set optimal bids” (source), so results may dip during learning. Broad match keywords gradually drift toward less relevant searches, your audience gets tired of the same ads, and seasons change how people shop.
- A real change in demand. The season, a new price, a product sold out, a competitor’s promotion. In that case, the drop shows up in your CRM and your sales too, not just in Google Ads.
How do you find the cause of a conversion drop?
Compare Google Ads with other sources: your CRM, the inbox where leads arrive, orders in your store’s admin panel, Google Analytics 4. Typical combinations:
| What you see | Possible cause | What to do |
|---|---|---|
| Conversions in Google Ads and leads in your CRM dropped at the same time | A website problem or a real drop in demand | Go through the whole customer journey yourself and test the form and checkout on your phone |
| Leads in your CRM are steady, but Google Ads shows almost zero | The conversion tag is missing or not firing | Check the conversion action status and test the tag with Tag Assistant |
| Conversions vanished right after a redesign or website migration | GTM or the Google tag was removed, or the thank-you page changed | Restore the container and the tag, and update the conversion trigger |
| Tracking works, your CRM also shows fewer leads, and irrelevant searches have appeared in the search terms report | The campaign lost effectiveness: broad match, new competitors, a bid strategy relearning | Add negative keywords and review your keywords, ads and bid change history |
| The drop started along with a new cookie banner | Consent mode settings | Check which consent signals the banner sends and which mode it uses |
| “Conversions” dropped, but “All conv.” didn’t | The conversion action was switched to secondary | Check the change history and your goal settings |
| Same number of orders, but the value dropped sharply | The tag stopped sending the order amount | Check whether the value parameter is sent with every purchase |
How to check your conversion tracking yourself
You’ll need your Google Ads account, a browser and a few minutes for a test lead:
- In Google Ads, go to Goals → Summary and check the status of each conversion action. “Awaiting conversions” means no conversions have been recorded in the last 7 days. Hover over the status to see exactly what needs fixing (tracking statuses).
- Launch Tag Assistant from the same page: enter your website address, complete a conversion (a test lead or purchase) and see whether the tag fired. Google notes that after approximately 30 minutes, the conversion actions verified in your debug session are updated in your Google Ads account (instructions).
- Open your website in an incognito window on your phone and go through the customer journey: fill out the form or place an order. Make sure the lead actually reaches you.
- Review the Google Ads change history for the days the drop began: did anyone change goal settings, the “Count” setting or the conversion window?
- Compare with Google Analytics 4: if key events disappeared in GA4 too, the problem is on your website or in your tags; if they’re in GA4 but not in Google Ads, it’s in your Google Ads conversion settings.
- Or use the FullCheckApp “Google Ads conversion drop monitoring” check (available on paid plans) and get the results in a clear visual format.
The most reliable test is a real lead: a tag that technically “works” doesn’t guarantee the form actually reaches your sales team. If conversion tracking is fine, look for the cause in the performance of the campaigns themselves: search terms, bids, ads and competitors.
If you chose the last option, you’ve already made the right call: the check runs automatically, and you’ll be the first to know about any warning or critical issue.
What FullCheckApp checks
FullCheckApp shows your ad account data on the Google Ads tab. There are two checks for conversions:
- Conversion drop — the number of conversions fell by 50% or more while clicks stayed steady. It’s flagged as a warning: this combination often means either a website or tracking failure, or a campaign that has lost effectiveness.
- Conversion value drop — two thresholds: −20% and −40%.
You set the severity of each check separately for each website. The service sends Telegram alerts about new critical issues and when they’re fixed.
Search — Wholesale coffee: conversions 96 → 46
Shopping — All products: conv. value $2,100 → $1,240
Technical causes of a drop often show up before they reach your Google Ads reports. Every day, FullCheckApp checks whether your website still has the Google Tag Manager container and the Google Analytics 4 tag, and whether your inner pages load — including the cart or lead form page, if you’ve added them to monitoring. For monthly conversions and value based on GA4 data, see Conversion and conversion value monitoring.
Google Ads monitoring is available on FullCheckApp paid plans.
FAQ
Why are there always fewer conversions in the last few days?
Google Ads records a conversion on the date of the click, not the date of the lead itself, and reporting lags can take up to 24–48 hours. If a customer buys a few days after clicking, the conversion shows up retroactively on an earlier day. That’s why the last 1–2 days almost always look worse than they really are.
How do I know if my Google Ads conversion tag is working?
In the Goals section of Google Ads, check the conversion action’s status: “Awaiting conversions” means no conversions have been recorded in the last 7 days. Then launch Tag Assistant, submit a test lead and check whether the tag fired. The conversion actions table updates after about 30 minutes.
What’s the difference between “Conversions” and “All conversions”?
The “Conversions” column includes only primary conversion actions, which automated bid strategies optimize for. “All conversions” also includes secondary actions, which are for observation only, and conversions from other sources. If an action is switched to secondary, it disappears from “Conversions” but stays in “All conversions.”
Can a cookie banner reduce the number of conversions?
Yes. Consent mode passes the visitor’s cookie choice to Google. In basic mode, no data at all is sent to Google for users who don’t consent. In advanced mode, the tags send cookieless pings, and Google can model some of the conversions. Changing your banner can noticeably change the number of conversions in your reports.
What should I do if the number of orders is the same but conversion value dropped?
Most likely, the tag stopped sending the order amount, and every conversion now gets the default value from the conversion action settings. Make a test purchase with Tag Assistant and check that the value parameter carries the real amount and the correct currency. Be especially careful after updating your cart module or payment system.
Sources
- Google Ads Help — Understand your conversion tracking datasupport.google.com/google-ads/answer/6270625?hl=en
- Google Ads Help — About primary and secondary conversion actionssupport.google.com/google-ads/answer/11461796?hl=en
- Google Ads Help — Troubleshoot performance fluctuations and changes in Google Ads campaignssupport.google.com/google-ads/answer/12077891?hl=en
- Google Ads Help — Conversion Tracking: Troubleshooting conversion tracking statussupport.google.com/google-ads/troubleshooter/13455130?hl=en
- Google Ads Help — Use Tag Assistant to troubleshoot your unverified or inactive conversion actionssupport.google.com/google-ads/answer/10989978?hl=en
- Google Ads Help — About consent modesupport.google.com/google-ads/answer/10000067?hl=en
- Google Ads Help — About conversion counting optionssupport.google.com/google-ads/answer/3438531?hl=en
- Google Ads Help — About conversion valuessupport.google.com/google-ads/answer/3419241?hl=en
- Google Ads Help — How our bidding algorithms learnsupport.google.com/google-ads/answer/10970825?hl=en
Keep Google Ads under control
Google Ads monitoring is available on paid plans — from $5 a month.
See pricing