How to Identify Underperforming Keywords After a Bid Change
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Quick answer
Underperforming keywords after a bid change are search terms that show weaker post-bid performance compared with the prior period. This usually appears as a lower conversion rate, rising wasted spend, or a worse return on ad spend for a keyword that previously performed acceptably. Identifying those terms quickly helps advertisers decide whether to reduce the bid, add a negative keyword, or pause the target before budget continues to leak.
A bid change can shift which placements or audiences your keyword reaches, so the same search term may suddenly behave differently. Rather than reviewing every keyword manually, you can filter the post-bid data by conversion drop and wasted spend signals, then prioritize the worst offenders for review.
Measure conversion rate first
After a bid change, start by comparing conversion rate before and after the adjustment window. A keyword that stopped converting at a similar click volume is often more informative than one that simply received fewer impressions. Use a negative keyword tool or waste detector module to pull post-bid metrics and isolate terms where clicks stayed steady but orders fell.
The goal is to separate normal fluctuation from a sustained shift. If the drop persists across several days or enough clicks to be meaningful, the keyword is a stronger candidate for a negative match or a lower bid.
Use wasted spend as a secondary signal
Wasted spend rises when a keyword keeps generating clicks without conversions. After a bid increase, this can happen if the new bid places the ad in front of less relevant queries or positions. Check the wasted spend trend alongside ACoS and ROAS. A term with a sharp increase in wasted spend after the change belongs in your cleanup list.
- Compare the same date range before and after the bid change where possible.
- Flag keywords with increased clicks but no change in orders.
- Review search term reports for new or irrelevant queries triggered by the adjusted bid.
When this matters
This process matters most when a bid change is intended to scale a profitable keyword or reclaim placement, but the post-bid data suggests the extra spend is not producing the same efficiency. It also matters when you manage multiple marketplaces or accounts and cannot manually monitor every search term. A tool like Amazon Negative Keyword Tool by Todoza can surface ranked underperforming terms so your team can approve changes before budgets are affected further.
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Once underperforming keywords are identified, the next step is to decide whether to reduce the bid, add a negative keyword, or pause the target. That decision fits directly into the broader comparison of placement performance before and after a bid change, because it turns post-bid analysis into a repeatable cleanup routine.