Negative keywords are one of the most powerful, yet often underutilized, tools in Google Ads. They allow you to prevent your ads from showing for search terms that are irrelevant to what you offer. This isn’t just about saving a few pennies-it’s about strategically eliminating waste to dramatically improve your campaign’s efficiency, click-through rate (CTR), and conversion rate.
Start with a Deep Dive into Your Search Terms
The first and most critical step is to audit your Search Terms Report. This report, found in your Google Ads account under “Keywords,” shows you the exact queries people used that triggered your ads. Initially, you’ll see a mix of relevant and wildly irrelevant terms. For example, if you sell premium office furniture, you might see a search for “cheap plastic chairs” or “how to fix a broken desk.” These are your initial targets.
Here’s how to approach this audit:
- Go through at least the last 30-90 days of data. Filter for terms that have spent money but led to zero conversions or even no clicks.
- Categorize terms into three buckets: Relevant, Irrelevant, and Questionable. The “Irrelevant” bucket is where you find your first negative keywords.
- Look for both single words and phrases. A term like “cheap” is a classic negative for a premium brand, but so is a phrase like “DIY office desk repair.”
Use the Right Match Types for Negative Keywords
Just like your regular keywords, negative keywords also use match types. Understanding these is essential for precision. You have three levels of control:
- Negative Phrase Match: Your ad won’t show if the search term contains the exact phrase in the same order. For example, adding negative “free samples” will block queries like “free samples of office chairs.” It’s the most commonly used and most practical starting point.
- Negative Exact Match: Your ad won’t show only if the search term is exactly that word or phrase. Adding negative [cheap chairs] will block that specific query but still allow “cheap office chairs” variations. Use this sparingly, as it offers the least protection.
- Negative Broad Match: This is the most aggressive. If a user’s search term contains any of the words in your negative broad match keyword, your ad won’t show. For instance, adding negative “cheap” (broad) blocks “cheap office chairs,” “how to find cheap desks,” and even “cheap delivery.” Use this with extreme caution-it can block far too much traffic if applied too broadly. I recommend starting with phrase and exact matches only for most advertisers until you have strong data.
Build a Strong, Layered Negative Keyword Strategy
You don’t just throw negative keywords in one place. For maximum efficiency, apply them at different levels:
- At the Campaign Level: Use this for broad, universal terms that apply to the entire campaign. For example, if you sell new furniture only, add negative “used,” “refurbished,” and “secondhand” at the campaign level to protect all ad groups within it.
- At the Ad Group Level: This is for granular, ad group-specific terms. If one ad group focuses on “leather office chairs,” add negatives like negative “fabric” or negative “mesh” here. This ensures your very specific ad group doesn’t show for its closest irrelevant terms.
- Create a Master Negative Keyword List: Keep a running list of well-performing negative keywords that you can share across multiple campaigns. This saves time and ensures consistency. Whenever you add a new campaign, import this list as a starting point.
Leverage Data and Automation for Ongoing Refinement
Negative keyword management isn’t a “set it and forget it” task. It’s a continuous cycle of review, refine, and repeat. Here’s how to stay on top of it:
- Set a recurring schedule. Dedicate 15-30 minutes each week to scanning your Search Terms Report for new, unwanted queries.
- Use automated rules carefully. You can set up a rule that automatically adds search terms with very low CTR or zero conversions after a certain spend threshold (e.g., $50 spent with zero conversions). This can be efficient but always double-check it-algorithms can miss nuance.
- Pay attention to “close variants.” Google often triggers ads for plurals, misspellings, and other variations of your keywords. These can become negative keyword opportunities too. A misspelling like “offiice chairs” might not be worth blocking, but a close variant like “office chair rental” likely is.
Common Mistakes to Avoid
- Over-aggressive negative keyword application: Avoid blocking broad terms that might eliminate profitable traffic. For three months, use only phrase and exact match negatives until you understand your account’s nuances.
- Ignoring the “other” search terms report: The “Other” tab in your search terms often hides long-tail, low-volume queries that can be high-converting or high-waste. Review it monthly.
- Not applying negatives to all campaigns: If you run a Display or YouTube campaign alongside your Search campaign, the same negative logic applies. A search term like “free” might be a negative across all your campaigns.
In our experience at Sagum, effective negative keyword management is one of the quickest, highest-ROI activities you can perform. It sharpens your targeting, lowers your cost per acquisition, and ensures your budget is spent only on searches that are truly aligned with your business goals. Start with a thorough audit, layer your negatives strategically, and commit to ongoing refinement-your efficiency will improve measurably.
