How to Find Negative Keywords for Amazon PPC

What are negative keywords?

Negative keywords prevent your ads from appearing when shoppers search for specific terms. They're your primary tool for eliminating wasted PPC spend. Every dollar spent on an irrelevant click is a dollar that could have been spent on a converting keyword.

For example, if you sell premium bamboo cutting boards, you don't want your ads showing for "plastic cutting board" or "cutting board repair." Without negative keywords, Amazon's broad and auto campaigns will happily spend your money on these irrelevant searches.

Most sellers underestimate the impact. A well-managed negative keyword strategy typically saves 15-25% of total ad spend. On a $5,000/month PPC budget, that's $750-$1,250 going back to your bottom line every month.

Negative exact vs negative phrase

Amazon offers two types of negative keyword matching, and using the wrong one can either waste money or block too much traffic:

Negative exact match blocks only the exact search term. Adding "plastic cutting board" as negative exact means your ad won't show for that exact phrase, but it will still show for "large plastic cutting board" or "cheap plastic cutting board." Use this when you want surgical precision.

Negative phrase match blocks any search that contains your phrase in order. Adding "plastic cutting board" as negative phrase blocks "plastic cutting board," "large plastic cutting board," "cheap plastic cutting board with handles," and any other search containing that phrase. Use this for broad categories of irrelevance.

A practical rule: use negative phrase for clearly irrelevant modifiers ("free," "repair," "DIY," "used") and negative exact for specific terms where the phrase might appear in relevant searches.

Finding wasted terms

The Search Term Report is your primary tool. Download it from Campaign Manager, covering the last 30 days for enough data. Sort by spend (highest first), then filter for terms with zero orders.

Look for these patterns:

• Completely irrelevant terms: searches for products you don't sell ("cutting board repair kit" when you sell cutting boards)
• Wrong material/type: "plastic" when you sell wood, "small" when you only sell large
• Informational intent: "how to clean cutting board" or "cutting board vs butcher block" (these rarely convert)
• Brand terms: searches for specific competitor brands where your product won't convert
• High-spend low-conversion: terms with many clicks but ACoS well above your target

The 20-click-zero-conversion rule

A widely used threshold: if a search term gets 20 clicks with zero conversions, negate it. This gives enough statistical significance to conclude the term isn't converting for your product. Some sellers use 15 (more aggressive) or 25 (more conservative). Find the threshold that matches your risk tolerance and average CPC.

The math supports this. If your average conversion rate is 10%, a keyword that gets 20 clicks "should" have produced 2 orders. Zero orders after 20 clicks means this keyword converts at well below your average, probably because it's not relevant to your product.

For high-CPC categories (where each click costs $2-3+), you might lower the threshold to 10-15 clicks to limit waste. For low-CPC categories ($0.20-0.50 per click), you can afford to wait for 25-30 clicks before deciding.

Preventing campaign cannibalization

When you graduate a keyword from auto to manual campaigns, add it as a negative exact in the auto campaign. This prevents both campaigns from bidding on the same term and inflating your costs. Without this step, you're literally competing against yourself in the auction.

This is one of the most commonly overlooked PPC optimizations. Sellers set up a proper campaign structure with auto research and manual exact-match campaigns, but forget to cross-negate. The result: both campaigns bid on the same search terms, driving CPCs higher than they need to be.

The fix is simple but needs to be done consistently. Every time a search term graduates from auto to manual, add it as a negative exact in the auto campaign on the same day. If you use Jarvio's PPC automation, this happens automatically with every graduation.

Common negative keyword mistakes

Being too aggressive too early. Adding negatives on terms with only 5-10 clicks is premature. You don't have enough data to know if the term will convert. Let it run to 20 clicks before deciding.

Negating at campaign level when ad group level is better. If you have multiple products in one campaign, a negative at campaign level blocks the term for all products. Sometimes a term is irrelevant for Product A but converts well for Product B. Use ad group-level negatives for precision.

Forgetting to audit negatives periodically. Over months, your negative keyword list grows. Some terms you negated 6 months ago might now be relevant (you expanded your product line, for example). Review your negative list quarterly.

Not negating branded terms in generic campaigns. If someone searches for a competitor's brand name, your generic campaigns might trigger. Unless you're intentionally conquesting, negate competitor brand names from your generic campaigns to avoid low-converting clicks.

Automating negative keywords

Manual negative keyword management works but doesn't scale. If you have 10+ campaigns, reviewing search terms across all of them weekly takes hours. Automation solves this by continuously monitoring search term data and applying your rules:

• Negate any term hitting your click threshold with zero conversions
• Cross-negate graduated terms between auto and manual campaigns
• Alert you when a previously good term starts underperforming
• Track cumulative waste savings over time

This is one of the highest-ROI automations for Amazon sellers. The math is straightforward: if automation saves $1,000/month in wasted spend, the ROI is immediate.