Negative Keywords on Amazon PPC: How to Stop Paying for the Wrong Clicks

Negative keywords in Amazon PPC are search terms you block so your ads stop showing for them. You add them to campaigns or ad groups that use auto, broad, or phrase targeting, and they prevent spend on searches that are irrelevant or proven not to convert. For most accounts, a weekly negative keyword pass is the fastest way to cut wasted spend.

Every click on an irrelevant search costs money just like a click on a perfect one. If you sell a stainless steel garlic press and your broad match keyword 'garlic press' is paying for 'garlic press attachment for mixer', that money is gone. Negatives fix this at the source.

How negative keywords work in Sponsored Products

• Two match types: negative exact and negative phrase. There is no negative broad in Sponsored Products.
• Two levels: campaign level (applies to every ad group in the campaign) and ad group level (applies only to that ad group).
• They work in auto and manual campaigns. In auto campaigns, negatives are one of the main ways to steer Amazon's matching.
• For product targeting and auto campaigns, you can also add negative product targets: specific ASINs or entire brands you don't want to appear against.
• Negative keywords have length limits. Amazon documents up to 10 words for negative exact and up to 4 words for negative phrase. Check the console if you hit an error.

Not sure which match type to use? We compare them in negative exact vs negative phrase.

Which search terms should you negate?

Pull a search term report covering at least the last 30 days. Then sort search terms into four groups.

The biggest mistake is negating group three. A term that converts at a high ACoS usually needs a lower bid, not a block. Blocking it throws away sales you could have bought profitably at a lower price.

Decision rules you can apply weekly

Use a click threshold tied to your own conversion rate. If your average conversion rate is 10%, you expect about one order every 10 clicks. A term with 15 to 20 clicks and zero orders is well past that and likely a poor fit.

1. Irrelevant search terms: negate exact (or phrase for a clearly wrong word like a different product type). No click threshold needed.
2. Relevant terms with clicks greater than or equal to 1.5x your clicks-per-order and zero orders: negate exact in that campaign.
3. Terms with spend greater than your target cost per order and zero orders: negate exact. For example, a $30 product at a 30% target ACoS has a target cost per order of $9. A term that has spent $12 with no sale has already failed.
4. Terms that converted and were moved to an exact campaign: add as negative exact in the auto, broad, and phrase campaigns they came from.

Worked example

Your auto campaign spent $410 last month and produced $900 in sales, a 45.6% ACoS against a 30% target. In the search term report, you find 22 terms that are clearly irrelevant ($64 spend, $0 sales) and 9 relevant terms with 15+ clicks and no orders ($88 spend, $0 sales). Negating those 31 terms removes $152 of spend. If nothing else changed, the campaign would have spent $258 for the same $900, a 28.7% ACoS. That is a target-hitting campaign without touching a bid.

Campaign level vs ad group level

Add a negative at the campaign level when the term is wrong for everything in that campaign, like a different product type. Add it at the ad group level when it is wrong for one product but right for another in the same campaign. For example, 'kids' might be a negative for your adult yoga mat ad group but a target for your kids' mat ad group.

Proactive negatives: block waste before it happens

You don't have to wait for spend to find obvious waste. Before launching a broad or auto campaign, add negative phrase terms for words that can never describe your product. Common examples include:

• Wrong product types or parts: 'replacement', 'refill', 'case', 'cover', 'parts' (if you sell the main product, not accessories).
• Wrong audience: 'kids', 'men', 'women', 'dog', 'cat' where they don't apply.
• Non-buyer intent: 'how to', 'diy', 'meaning', 'free'.
• Used or alternate formats: 'used', 'rental', 'printable' (if relevant to your category).

Be careful with single-word negative phrases. A negative phrase 'case' blocks 'phone case' but also 'carrying case included'. Check that the word truly never appears in a good search.

Negative keywords in Sponsored Brands

Sponsored Brands campaigns that use keyword targeting also support negative exact and negative phrase keywords. The same logic applies: block searches that are irrelevant or keep failing. Sponsored Brands ads tend to carry higher CPCs because they occupy prominent placements, so waste adds up faster there. Pull the Sponsored Brands search term report separately; negatives you add in Sponsored Products do not carry over.

Keep a shared negative list

If you run many campaigns for related products, keep a master spreadsheet of negatives by reason: wrong product type, wrong audience, non-buyer intent, and proven non-converters. When you launch a new campaign, start it with the relevant parts of that list instead of rediscovering the same waste. Review the list each quarter and remove anything that no longer applies, such as a size or color you now sell.

Mistakes that block good traffic

• Negating your own core terms because they had a bad week. Look at 30 to 60 days before blocking a core keyword.
• Adding a broad negative phrase that catches your best searches (for example, negative phrase 'large' when you sell a large size).
• Negating a converting term at the campaign level in your exact campaign, which shuts off the very keyword you are trying to scale.
• Never reviewing old negatives. Products, listings, and seasons change. Review your negative lists every quarter.

For a faster way to spot bad terms, see how to find irrelevant search terms. If you want this done continuously, AdSpark's AI search-term review flags wasteful terms to negate and converting ones to harvest, with every action logged and reversible. It is one of the main levers covered in how to cut wasted ad spend.

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