7 Keyword Optimization Strategies for Ecommerce PPC That Actually Reduce Wasted Spend

Google Ads keyword matching is broader than most advertisers realize. A keyword like "running shoes" can trigger ads for searches like "how to clean running shoes," "DIY shoe repair," or "free shoe samples." None of those searchers are buying anything from you today, but you're paying for their clicks anyway.

This is the core challenge of keyword optimization for ecommerce PPC: your keywords and the search terms they match to are not the same thing. Keywords are what you add to your ad groups. Search terms are what people actually type into Google. The gap between those two things is where budget bleeds out.

The seven strategies below address that gap from different angles. Some are structural, like how you organize match types. Some are operational, like how often you review your search terms report. All of them are practical and applicable directly inside Google Ads, whether you're managing one store or a roster of client accounts.

These strategies assume you already know the basics. No definitions of what PPC means or why Google Ads exists. Just the process-level guidance that most articles skip over.

1. Separate Match Types Into Distinct Ad Groups

The Challenge It Solves

When broad match, phrase match, and exact match keywords share the same ad group, you lose visibility into what's actually driving performance. A conversion could come from a tightly matched exact match query or a loosely related broad match search term, and you'd have no clean way to tell. That ambiguity makes it hard to bid intelligently or scale what works.

The Strategy Explained

Separating match types into their own ad groups gives you clean, interpretable data for each traffic tier. Broad match captures exploratory traffic and surfaces new search term ideas. Phrase match balances reach with relevance. Exact match locks in proven queries with predictable intent.

With this structure, you can apply different bids to each match type, allocate budget based on actual performance, and pause underperformers without disrupting the rest of the account. It also makes it easier to spot when broad match is cannibalizing budget that should go to your exact match terms.

For more context on when each match type makes sense, it helps to understand when to apply match types in Google Ads and what impact match types have on CPC and conversions.

Implementation Steps

1. Audit your current ad groups and identify any that mix multiple match types for the same keyword theme.

2. Create separate ad groups for broad, phrase, and exact match variants of each keyword theme. Use a clear naming convention like "Running Shoes | Broad," "Running Shoes | Phrase," and "Running Shoes | Exact."

3. Set bids at the ad group level to reflect the expected intent and conversion likelihood of each match type tier. Exact match typically warrants a higher bid than broad.

4. Monitor search term overlap between ad groups and use negative keywords to prevent match type cannibalization.

Pro Tips

If you're unsure when to use broad match versus exact keywords, start conservative. Broad match gives Google the widest latitude to match your keywords to search terms, including searches that may have little to do with your products. Use it intentionally, with a strong negative keyword list in place, not as a default setting.

2. Mine Your Search Terms Report Weekly

The Challenge It Solves

The Search Terms Report is the closest thing Google Ads gives you to a direct window into buyer intent. Without reviewing it regularly, irrelevant traffic accumulates quietly. A search term that costs you a few dollars a day might look harmless in isolation, but across dozens of campaigns over weeks, it adds up fast. The problem compounds because Google's matching continues to broaden over time unless you actively shape it.

The Strategy Explained

A weekly review of your Search Terms Report lets you catch irrelevant traffic before it becomes a budget problem. More importantly, it surfaces high-performing search terms you didn't think to bid on. When a search term is converting well, you can promote it to a positive keyword and bid on it directly. When it's clearly irrelevant, you add it as a negative keyword to prevent future matches.

If your ads are showing for the wrong keywords or you're seeing unexpectedly poor traffic quality, the Search Terms Report is usually where the answer lives.

This is also where tools like Keywordme can speed up the process considerably. Instead of exporting search term data to a spreadsheet and working through it manually, Keywordme lets you act on search terms directly inside the Google Ads interface. One click to add a negative, one click to promote a term to a keyword, without leaving the report you're already reviewing.

Implementation Steps

1. Navigate to your Search Terms Report inside Google Ads and filter by a rolling 7-day window.

2. Sort by cost to identify the highest-spend search terms first. These are your most urgent optimization targets.

3. Flag each search term as: promote to keyword, add as negative, or leave for now.

4. Add negatives immediately. Promoted terms should be added to the appropriate match type ad group.

5. Repeat weekly. Set a recurring calendar block so this doesn't slip.

Pro Tips

Don't only look at what's performing badly. Some of your best keyword ideas come from search terms you never thought to add. If a search term has generated multiple conversions at a reasonable cost, it's telling you something about buyer behavior worth acting on.

3. Build a Layered Negative Keyword Strategy

The Challenge It Solves

A single flat list of negative keywords at the campaign level is better than nothing, but it's not precise enough for ecommerce accounts with multiple product categories, ad groups, and intent tiers. Without a layered approach, you either over-exclude and miss relevant traffic, or under-exclude and keep paying for searches that will never convert.

The Strategy Explained

A layered negative keyword strategy uses campaign-level negatives for broad, account-wide exclusions and ad group-level negatives for more targeted filtering. Campaign-level negatives are useful for terms that are irrelevant across your entire product catalog: words like "free," "DIY," "how to," "jobs," or "reviews" if you're not targeting informational traffic. Ad group-level negatives handle more specific conflicts, like preventing a "women's running shoes" ad group from matching searches that belong in your "men's running shoes" ad group.

Shared negative keyword lists take this further. Google Ads allows you to create shared lists that apply across multiple campaigns simultaneously. For agencies managing multiple client accounts, this is a significant time-saver when common exclusion patterns apply across campaigns.

Understanding why negative keywords matter and the best way to add negative keywords in Google Ads will help you build this structure correctly from the start. It also helps to know the difference between shared lists and campaign-specific negatives before deciding which layer to use.

Implementation Steps

1. Start with a campaign-level negative keyword list covering terms that are universally irrelevant to your ecommerce store: informational queries, competitor brand terms you don't want to target, and non-commercial modifiers.

2. Review your Search Terms Report (see Strategy 2) and identify search terms that are relevant to one ad group but should be excluded from others. Add these at the ad group level.

3. Create shared negative keyword lists in Google Ads for exclusions that apply across multiple campaigns. Apply them to all relevant campaigns.

4. Review and update your negative keyword lists monthly as new irrelevant search terms surface.

Pro Tips

Be careful with broad match negatives at the campaign level. A negative keyword added as broad match will block any search containing that word, which can accidentally exclude relevant traffic. Use phrase match or exact match for negatives when precision matters.

4. Cluster Keywords by Purchase Intent

The Challenge It Solves

Ecommerce searches span a wide range of intent. Someone searching "best trail running shoes for wide feet" is in a different mindset than someone searching "buy Brooks Cascadia 17 size 11." Treating both with the same ad copy and landing page wastes the opportunity to meet each shopper where they actually are in their decision process.

The Strategy Explained

Grouping keywords by purchase intent lets you tailor your messaging and destination pages to match what each searcher is actually looking for. Three intent categories are most useful for ecommerce:

Informational intent: Searches like "how to choose running shoes" or "trail vs. road running shoes." These searchers are researching, not buying. Ads targeting this group should point to content that builds trust and moves them toward a purchase decision.

Comparative/navigational intent: Searches like "Brooks vs. ASICS running shoes" or "Nike running shoes reviews." These searchers are narrowing their options. Ad copy that highlights your selection, pricing, or return policy can be effective here.

Transactional intent: Searches like "buy Brooks Ghost 16 women's size 8" or "running shoes under $100 free shipping." These searchers are ready to buy. Send them directly to a product page or category page with a clear path to checkout.

This kind of keyword intent clustering also supports smarter bidding. You can bid more aggressively on transactional intent keywords where conversion likelihood is highest, and bid more conservatively on informational terms where the path to purchase is longer.

Implementation Steps

1. Export your current keyword list and categorize each keyword as informational, comparative, or transactional based on the modifier words used.

2. Create separate ad groups for each intent tier within each product category.

3. Write ad copy that matches the intent of each group. Transactional ad groups should lead with pricing, availability, and a direct call to action. Informational groups can focus on expertise and selection.

4. Map each ad group to a landing page that matches the intent. Don't send informational searchers to a checkout-focused product page.

Pro Tips

Transactional intent keywords are often your highest-value terms. If you're not sure which of your keywords fall into this category, look for modifiers like "buy," "order," "price," "cheap," "discount," specific model numbers, and size or color attributes. These signal that the searcher knows what they want.

5. Promote High-Converting Search Terms to Exact Match Keywords

The Challenge It Solves

Broad match and phrase match are useful for discovery, but they introduce variability. When a search term consistently drives conversions through a broad or phrase match keyword, you're relying on Google's matching to keep delivering that same traffic. That's not guaranteed. Promoting proven search terms to exact match keywords removes that uncertainty and lets you bid on that specific query with confidence.

The Strategy Explained

Exact match keywords in Google Ads (formatted as [keyword]) restrict matching to queries with the same meaning or intent as your keyword. When you identify a search term that has a strong conversion history, adding it as an exact match keyword in its own ad group gives you direct control over bidding and budget allocation for that specific demand.

This is especially valuable in ecommerce, where specific product queries like "[Brooks Ghost 16 women's size 8]" or "[waterproof trail running shoes men]" represent high-intent buyers. Capturing that traffic predictably, rather than hoping broad match surfaces it again, is a meaningful improvement in account efficiency.

If you're seeing broad match wasting budget or broad match bringing in poor-quality traffic, this strategy is one of the most direct fixes.

Implementation Steps

1. In your Search Terms Report, filter for search terms with at least three to five conversions over a meaningful time window (typically 30 to 90 days, depending on your traffic volume).

2. Add those search terms as exact match keywords in a dedicated ad group.

3. Set a bid that reflects the proven conversion value of that query. You can afford to bid more aggressively on a term you know converts.

4. Add the promoted search term as a negative keyword in your broad and phrase match ad groups to prevent cannibalization.

Pro Tips

Don't promote every converting search term immediately. Wait until you have enough data to be confident the conversion wasn't a one-off. A single conversion on a low-volume query isn't a strong enough signal. Look for consistent performance before committing to exact match.

6. Build Out Long-Tail Keywords to Reach High-Intent Shoppers

The Challenge It Solves

Broad category keywords like "running shoes" or "women's sneakers" are expensive and competitive. They also attract a wide range of searchers, many of whom are browsing rather than buying. If your cost per conversion is high, one contributing factor may be that your keyword list skews too heavily toward generic, high-competition terms that attract low-intent traffic.

The Strategy Explained

Long-tail keywords are more specific queries that typically include product attributes: brand, model, size, color, material, use case, or price range. Examples include "women's waterproof trail running shoes size 9," "Brooks Adrenaline GTS 23 wide fit," or "minimalist running shoes under $80."

These searches tend to come from buyers who have already done their research and know what they want. They also tend to face less competition than broad category terms, which can make them more cost-efficient to bid on. The trade-off is lower search volume per keyword, but that's offset by higher conversion likelihood and lower cost per click in many cases.

Building a strong long-tail keyword set requires looking at your product catalog systematically. Every product attribute is a potential keyword modifier.

Implementation Steps

1. Start with your product feed or catalog. List every meaningful attribute for each product: brand, model, color, size, material, gender, use case, and price tier.

2. Combine those attributes into keyword phrases. Use your Search Terms Report to identify attribute combinations that are already generating clicks organically, then build keywords around them.

3. Add long-tail keywords as phrase match or exact match. Broad match on long-tail terms often defeats the purpose by expanding into shorter, less specific queries.

4. Group long-tail keywords by product category and intent in your ad group structure, consistent with Strategy 4.

Pro Tips

Don't ignore model numbers and SKU-level queries. Shoppers who search for a specific model number are often at the end of their decision process. If you carry that product, bidding on its model number as an exact match keyword is one of the most targeted placements available in ecommerce PPC.

7. Set Performance Thresholds and Prune Regularly

The Challenge It Solves

Keyword lists grow over time, and not all keywords age well. A keyword that seemed relevant at launch may accumulate spend for months without generating a single conversion. Without a regular pruning process, these underperformers quietly dilute your return on ad spend and consume budget that could go toward terms that are actually working.

The Strategy Explained

Pruning is about setting clear performance thresholds and enforcing them consistently. The goal isn't to pause everything that hasn't converted recently. It's to identify keywords that have had a fair opportunity to perform and haven't, then make a deliberate decision about what to do with them.

Common actions for underperforming keywords include pausing, reducing bids, adjusting match type, or reviewing the landing page experience. Sometimes a keyword isn't the problem. The ad copy or the page it sends traffic to is what needs fixing. Pruning forces you to look at the full picture.

For a structured approach to this, see the best ways to reduce wasted spend in Google Ads.

Implementation Steps

1. Define your performance thresholds before you start reviewing. A common starting point: any keyword that has spent more than your average cost per conversion target without generating a conversion is a candidate for review. Adjust this based on your traffic volume and typical sales cycle.

2. Filter your keyword list by spend over the past 30 to 90 days. Sort by conversions ascending to surface the highest-spend, lowest-converting keywords first.

3. For each flagged keyword, check the search terms it has matched to. If it's matching to irrelevant queries, a negative keyword fix may be enough. If the keyword itself is off-target, pause it.

4. Document your decisions. Knowing why you paused a keyword helps you avoid re-adding it later and gives you a reference point for future audits.

5. Schedule this review on a monthly or quarterly basis, depending on your account size and budget.

Pro Tips

Pausing a keyword isn't permanent. If you improve the landing page, change your bidding strategy, or refine your match type, a previously underperforming keyword might be worth testing again. Keep a record of paused keywords with notes on why they were paused so you can revisit them with fresh context.

Your Implementation Roadmap

These seven strategies work best when you implement them in a logical order rather than all at once. Here's a practical sequence to follow.

Start with the Search Terms Report review and negative keyword build-out. These two steps deliver the fastest impact on wasted spend because they directly cut irrelevant traffic that's already costing you money. Even a single week of consistent review and negative keyword additions will show results in your account data.

Next, tackle match type separation and intent clustering. These are structural changes that require more planning but pay dividends in data clarity and bidding precision. Getting your account organized by match type and intent gives you a stable foundation for everything that follows.

Once the structure is solid, layer in long-tail expansion and the exact match promotion process as ongoing habits. These are not one-time tasks. Every week of search term data gives you new opportunities to promote high-intent queries and build out your long-tail coverage.

Finally, build pruning into your monthly or quarterly routine. A clean, focused keyword list is easier to manage, easier to optimize, and more efficient with budget than a bloated one.

The advertisers who see the best results from keyword optimization treat it as a recurring workflow, not a setup task. Reviewing search terms, adding negatives, promoting high-performers, and pruning the rest is a cycle that compounds over time.

If you want to move through that cycle faster, Start your free 7-day trial of Keywordme and see how much time you save by acting on search term data directly inside Google Ads, without exporting to spreadsheets or switching between tools. After the trial, it's $12 per month per user.