Adding negative keywords to Performance Max campaigns is the single most requested lever advertisers want but cannot fully use the way they are accustomed to in standard Search or Shopping campaigns. Negative keywords in Performance Max are campaign-level exclusions that prevent your ads from showing on specific search queries, but they operate within a fundamentally different targeting architecture where Google's automation controls most of the signal interpretation. By the end of this guide, you will know how to audit PMax search term data, build a tiered negative keyword list that protects budget without starving the algorithm of learning signals, and use audience signals as a smarter complement to hard keyword blocks.
What you will need before starting: A Google Ads account with at least one active Performance Max campaign, at least 30 days of conversion data, access to the Search Terms Insight report, and (ideally) a Google Ads representative or the ability to submit account-level negative keyword list requests through the interface.
Before You Start: Understand How Negative Keywords Behave Inside PMax
Performance Max does not give you the same granular keyword control as Search campaigns. Google introduced the ability to add campaign-level negative keywords to PMax in 2024, but the mechanics are different from what you are used to. PMax runs across Search, Shopping, Display, YouTube, Discover, Gmail, and Maps simultaneously. A negative keyword in PMax only affects the Search and Shopping inventory slices. It does not block Display placements, YouTube targeting, or Discover feeds.
This matters because over-excluding keywords can choke the Search and Shopping signals that PMax relies on for its broader cross-network optimization. Before you touch anything, accept this constraint: you are managing a fraction of PMax's targeting surface with negative keywords, and you need audience signals to handle the rest.
Step 1. Audit What PMax Is Actually Targeting Before You Block Anything
The worst thing you can do is import a generic negative keyword list from another campaign type and apply it to PMax. The first step is understanding what PMax is actually matching on, which requires using the Search Terms Insight report (not the same as the standard Search Terms report in Search campaigns).
How To Access The Search Terms Insight Report
Navigate to your Performance Max campaign, click "Insights" in the left panel, then scroll to the Search Terms section. This report groups queries into "search categories" and "search themes" rather than showing every individual query. It is less granular than Search campaign reports, but it tells you where PMax is allocating impressions and conversions at the theme level.
Separate Brand, Generic, And Competitor Traffic
Tag each search theme as brand (your brand terms), generic (non-branded category terms), or competitor (rival brand names). Brand traffic in PMax often inflates ROAS figures and hides poor generic performance. If PMax is cannibalizing your brand Search campaign, that is a separate structural issue you need to address before adding negatives. For a deeper look at how Smart Bidding interacts with these dynamics, the incentive misalignment is worth understanding.
Identify Genuinely Wasteful Queries vs. Low-Intent-But-Convertible Ones
Not every low-converting search theme is waste. PMax uses early-funnel impressions to build audience models that drive later conversions. A search theme with zero direct conversions but strong assisted conversion value may actually be doing useful work. Separate your findings into three buckets: obviously irrelevant (no business relationship at all), possibly wasteful (tangentially related but not converting), and uncertain (low conversion but potential assisted value). Only the first bucket gets blocked immediately.
Step 2. Build A Tiered Negative Keyword Architecture For PMax
A flat negative keyword list applied uniformly across PMax will either do too little or too much. The right structure is tiered, with different exclusion levels handling different types of waste.
Tier 1: Account-Level Shared Negative Lists For Universal Blocks
These are terms that are never relevant to your business under any circumstance. Examples: job-related queries ("careers," "salary," "hiring") if you are not recruiting, completely unrelated industries, explicit or offensive terms, and DIY/free queries if you sell a premium service. Create a shared negative keyword list at the account level and apply it to your PMax campaign. This list should be tight: typically 50 to 150 terms, not thousands.
You can create shared negative keyword lists under Tools > Shared Library > Negative Keyword Lists. Once created, apply the list to your PMax campaign(s) directly.
Tier 2: Campaign-Level Negatives For PMax-Specific Irrelevant Signals
These are terms that are irrelevant to a specific PMax campaign but might be valid elsewhere in your account. For example, if you run separate PMax campaigns for different product lines, exclude Product Line B terms from Product Line A's campaign. Add these directly as campaign-level negative keywords within each PMax campaign.
Keep match types precise here. Exact match negatives are safer than broad match negatives in PMax because PMax's query interpretation is already broad. A broad match negative like "free" could block queries like "free shipping included" that are actually purchase-intent signals.
Tier 3: What You Cannot Exclude And Must Manage Through Audience Signals
Here is where most advertisers get frustrated. There are entire categories of queries and placements you cannot block with negative keywords because they run on Display, YouTube, and Discover. You also cannot add negative keywords at the asset group level within a PMax campaign. If PMax is showing your ads to irrelevant audiences on non-Search placements, the only lever is audience signals, which we cover in the next step.
This is one of the areas where Performance Max budget controls intersect with negative keyword strategy. If you cannot block the traffic, you need to control the budget allocation instead.
Step 3. Use Audience Signals To Guide PMax Away From Waste Without Hard Blocks
Audience signals in PMax are not hard targeting constraints. They are suggestions that tell Google's algorithm where to start looking for converters. But strong audience signals consistently outperform keyword-level exclusions for steering PMax away from low-quality traffic on non-Search placements.
How First-Party Data Audiences Steer PMax More Effectively Than Keywords
Upload your customer email lists, CRM segments, and website visitor lists as audience signals in each asset group. When PMax has a clear picture of who your actual buyers are, it builds lookalike targeting models that are inherently more relevant. This reduces wasted impressions on irrelevant audiences across Display and YouTube without you needing to block anything manually.
The hierarchy matters: first-party data (Customer Match lists, converters) is the strongest signal. In-market and affinity audiences are weaker. Custom segments based on search themes sit in the middle. Layer all three, but weight your first-party data most heavily by placing it in its own asset group or as the primary signal.
Customer Match, Remarketing, And Similar Segments As Positive Steering Signals
Instead of trying to block every bad query, tell PMax who your best customers are. Upload a Customer Match list of your highest-LTV buyers. Add your remarketing lists for site visitors who viewed key pages. Then add custom intent segments built from your top-performing search terms in other campaigns. This combination gives PMax a strong starting model that reduces drift into irrelevant territory.
This approach also avoids the common negative keyword mistake of over-excluding converting terms that many advertisers make when they treat PMax like a standard Search campaign.
Step 4. Monitor Impression Quality After Adding Negatives
Adding negative keywords to PMax without monitoring the downstream impact is like adjusting medication dosage without checking vitals. You need a monitoring framework in place before you make changes, not after.
Check Impression Volume And Conversion Rate Within 7 Days
After adding negatives, compare week-over-week impressions, clicks, conversions, and conversion value. A small dip in impressions (5 to 15 percent) paired with stable or improved conversion rate means your negatives are working correctly. A large impression drop (more than 25 percent) with falling conversion volume means you have likely over-excluded.
The Budget Pacing Check: Signs You Have Over-Excluded
If PMax is no longer spending its daily budget after you add negatives, that is the clearest signal of over-exclusion. PMax is designed to spend its full budget across all available inventory. When it suddenly cannot, you have removed too many targeting opportunities. Roll back your most recent negative additions in order and monitor which restoration brings spend back to normal.
Also watch for rising CPCs. When you shrink PMax's eligible auction pool, you increase competition density on the remaining queries, which can drive cost per click up even as total impressions fall.
Step 5. Build A Maintenance Cadence Instead Of A One-Time Block List
PMax targeting shifts constantly as Google updates its automation and as your conversion data evolves. A negative keyword list applied once and never revisited will degrade within weeks.
Weekly Vs. Monthly Review Rhythms
For accounts spending under $25,000 per month on PMax, a monthly review of the Search Terms Insight report is adequate. For accounts above that threshold, weekly reviews are necessary because higher spend means faster signal accumulation and more rapid targeting drift.
Each review session should take 20 to 30 minutes: pull the Insight report, check for new irrelevant search themes, cross-reference against your tiered negative list, and add only terms that are clearly wasteful. Resist the urge to add marginal terms. PMax needs room to explore.
How Autonomous Engines Handle Negative Keyword Management Without Manual Lists
This is where the manual process breaks down at scale. If you are managing PMax across multiple accounts, each with its own negative lists, audience signals, and budget constraints, the maintenance burden compounds quickly. A proprietary engine like the one underlying groas monitors query-level signals, impression quality, and conversion patterns continuously. For agencies using the groas engine through the DIY product, this means negative keyword management across dozens of client PMax campaigns happens algorithmically rather than through spreadsheet reviews. For in-house teams on the DWY product, the groas engine handles the heavy lifting while a senior strategist reviews the output with your team on a regular cadence. The difference between manual negative keyword hygiene and engine-driven optimization shows up most clearly in PMax because the campaign type changes behavior faster than a human can audit.
Common Mistakes To Avoid
Importing a Search campaign negative list directly into PMax. Search negatives are calibrated for exact query matching. PMax interprets queries more broadly, so a negative list designed for Search will almost always over-block.
Using broad match negatives aggressively. A broad match negative for "cheap" in PMax could block "cheap flights to Hawaii" if you sell travel, even though that is a high-intent commercial query. Use exact match or phrase match negatives unless you are certain the broad match term has zero commercial relevance.
Blocking competitor brand terms without checking performance. Competitor queries in PMax sometimes convert at respectable rates because PMax pairs them with Shopping or Display placements where comparison shoppers convert. Check actual conversion data before excluding.
Adding negatives and forgetting to monitor. Every negative keyword changes PMax's available auction pool. Without a monitoring step, you will not know if you helped or hurt performance until the month-end report, at which point you have already lost budget.
Neglecting audience signals as an alternative. Negative keywords only affect Search and Shopping inventory in PMax. If your waste is coming from Display or YouTube placements, no amount of negative keywords will fix it. Audience signals are the correct lever for those surfaces.
Over-blocking low-funnel queries that feed PMax's learning model. PMax uses early interactions to build its conversion model. Blocking terms that seem low-intent but generate engaged sessions can weaken PMax's ability to find converters at scale.
How groas Handles PMax Negative Keyword Management For You
The five-step process above works. It also requires consistent attention, strong analytical judgment, and the discipline to review and adjust weekly. For most in-house teams, that attention competes with every other marketing priority. For agencies, it multiplies across every client account.
groas approaches this differently depending on how you work with it. The proprietary engine, trained on over $500 billion in profitable ad spend, monitors PMax query patterns, impression quality, and conversion signals continuously across every account it powers. It identifies wasteful query themes before they accumulate meaningful spend and adjusts targeting signals algorithmically.
For agencies using groas through the DIY product, this means your media buyers can connect unlimited client accounts and let the engine handle PMax negative keyword hygiene at scale, freeing your team to focus on strategy and client relationships rather than weekly spreadsheet audits. Start your 7-day free trial to see how it works across your client book.
For in-house teams who know their accounts and want to stay in control, the DWY product pairs the engine's continuous monitoring with a senior strategist who reviews PMax performance with your team, flags when negatives need adjustment, and provides the strategic context the engine cannot. Get started and see the difference within the first few weeks.
For businesses that want PMax fully managed without logging into the account, the DFY service means a dedicated strategist owns your entire PMax strategy end-to-end, including negative keyword architecture, audience signal optimization, and budget allocation, so you never think about search term reports again. Apply to see if DFY is the right fit.
Final Verdict
Adding negative keywords to Performance Max protects your budget, but only if you do it with precision. Audit before you block. Build a tiered structure instead of a flat list. Use audience signals to handle what keywords cannot. Monitor relentlessly, and build a recurring cadence rather than treating it as a one-time task. The advertisers who get PMax right are the ones who understand that negative keywords are one lever among several, not a silver bullet. And the ones who scale PMax profitably are the ones who recognize when the maintenance burden exceeds what manual effort can sustain. That is where groas picks up: an engine that never stops optimizing, paired with senior strategists who know exactly when to pull each lever. Whether you run an agency, manage ads in-house, or want the whole thing handled, groas has a product built for how you work.
Frequently Asked Questions About Negative Keywords In Performance Max
Can You Add Negative Keywords To Performance Max Campaigns?
Yes. Google introduced campaign-level negative keywords for Performance Max in 2024. You can add them directly within the PMax campaign settings or apply shared negative keyword lists from your account-level Shared Library. However, negative keywords in PMax only affect Search and Shopping inventory. They do not block Display, YouTube, Discover, Gmail, or Maps placements. This is a critical distinction because PMax runs across all of those surfaces simultaneously. For the non-Search inventory, you need to rely on audience signals to steer targeting away from irrelevant traffic.
How Do I Find What Search Terms Performance Max Is Targeting?
Use the Search Terms Insight report inside your PMax campaign. Navigate to the campaign, click Insights in the left panel, and scroll to the Search Terms section. Unlike the standard Search Terms report in Search campaigns, PMax groups queries into search categories and search themes rather than listing every individual query. This gives you theme-level visibility into where PMax is allocating impressions and conversions, which is enough to identify wasteful patterns even without full query-level transparency.
What Is The Difference Between Account-Level And Campaign-Level Negative Keywords In PMax?
Account-level shared negative keyword lists apply universally across every campaign they are attached to, including PMax. These are best for terms that are never relevant to your business under any circumstance: job queries, completely unrelated industries, offensive terms. Campaign-level negatives are specific to one PMax campaign and are useful when you run multiple PMax campaigns for different product lines or business units. Use exact match or phrase match negatives at the campaign level to avoid accidentally blocking converting queries.
How Many Negative Keywords Should I Add To Performance Max?
There is no universal number, but restraint matters more than coverage. A well-constructed Tier 1 account-level list is typically 50 to 150 terms. Campaign-level negatives should be even tighter, focused only on terms clearly irrelevant to that specific campaign. Adding thousands of negatives, as some advertisers do when importing lists from Search campaigns, almost always over-blocks and starves PMax of the learning signals it needs. Start small, monitor impact for 7 days, and expand only when data confirms waste.
Can Negative Keywords Hurt Performance Max Performance?
Absolutely. Over-excluding keywords can crush PMax reach, raise CPCs on remaining queries, and prevent the campaign from spending its daily budget. PMax uses early-funnel impressions to build its conversion model. Blocking terms that seem low-intent but generate engaged sessions weakens PMax's ability to find converters at scale. The telltale sign of over-exclusion is PMax suddenly underspending its budget. If that happens, roll back your most recent negative additions and monitor.
How Do Audience Signals Work As An Alternative To Negative Keywords In PMax?
Audience signals tell PMax where to start looking for converters. They are not hard targeting constraints, but strong first-party data signals, such as Customer Match lists, remarketing audiences, and custom intent segments, consistently steer PMax toward higher-quality traffic across all placements, including Display and YouTube where negative keywords have no effect. Layering first-party data as the primary signal, supplemented by in-market and affinity audiences, gives PMax a conversion model that reduces drift into irrelevant territory.
How Often Should I Review PMax Negative Keywords?
For accounts spending under $25,000 per month on PMax, a monthly review of the Search Terms Insight report is sufficient. Above that threshold, weekly reviews are necessary because higher spend drives faster signal accumulation and more rapid targeting drift. Each review should take 20 to 30 minutes. For teams that find this cadence difficult to maintain, groas handles this continuously. The proprietary engine monitors query patterns and impression quality in real time, while a senior strategist reviews PMax performance on a regular schedule with your team.
Can groas Manage PMax Negative Keywords Automatically?
Yes. The groas engine, trained on over $500 billion in profitable ad spend, monitors PMax query-level signals, impression quality, and conversion patterns continuously. It identifies wasteful query themes before they accumulate meaningful spend and adjusts targeting signals algorithmically. For agencies, the DIY product lets media buyers connect unlimited client accounts and offload PMax negative keyword hygiene at scale. For in-house teams, the DWY product pairs engine-driven monitoring with a senior strategist. For businesses that want full management, the DFY service handles negative keyword architecture, audience signals, and budget allocation end to end.
Should I Exclude Competitor Brand Terms From Performance Max?
Not automatically. Competitor queries in PMax sometimes convert at respectable rates because PMax pairs them with Shopping or Display placements where comparison shoppers are ready to buy. Always check actual conversion data before excluding competitor terms. If a competitor search theme shows zero conversions and significant spend after 30 or more days, exclude it. If it converts, even at a lower rate, consider keeping it and managing it through budget controls rather than outright exclusion.
What Happens If Performance Max Stops Spending After I Add Negative Keywords?
This is the clearest signal of over-exclusion. PMax is designed to spend its full daily budget across all available inventory. When it suddenly cannot, you have removed too many targeting opportunities from the eligible auction pool. Roll back your most recent negative keyword additions in reverse order and monitor which restoration returns spend to normal. Also check CPCs: a shrinking auction pool increases competition density on remaining queries, which can drive costs up even as total impressions fall.
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