Google Display Network Placement Blocking: The Guide to Stopping Budget Waste on Bad Sites

The Google Display Network reaches over 90% of internet users worldwide. That sounds like an advantage. In practice, for most advertisers running Display campaigns without active placement management, it means paying for impressions on children's games, foreign-language content farms, parked domains, and sites where no real purchasing intent exists.

The problem is not that Display Network advertising doesn't work. It is that Google's algorithm, left to its own discovery process, will optimize toward low-cost inventory that generates impressions and clicks — not toward inventory that generates conversions. The responsibility for defining where your ads should not appear sits entirely with the advertiser.

This guide covers how to identify bad placements, which categories to block first, how to handle the specific problem of mobile app inventory, and how to build a lasting exclusion system that compounds in value over time.

Why Display Network Placement Quality Matters More Than You Think

Most advertisers think of placement blocking as a cleanup task — something you do after a campaign underperforms. The reality is that placement quality is a foundational input that affects every other metric in a Display campaign.

When your ads appear on irrelevant or low-quality placements, several things happen simultaneously. Your click data becomes polluted with accidental clicks that never convert — teaching automated bidding to find more of the same. Your conversion rate data degrades because non-converting clicks drag down campaign averages. Your audience signals weaken because users who clicked your ad from a children's game are not meaningfully similar to your real customers. And your brand appears in contexts that may undermine the credibility you're building in other channels.

The Compounding Cost of Unmanaged Placements

In accounts we audit that have never been actively managed, a consistent pattern emerges: 10–15% of placements typically account for 50–70% of spend, while generating less than 5% of conversions. This is not a minor inefficiency. It means the majority of Display budget is operating at a ROAS that is negative from a contribution margin perspective — subsidized by the small number of placements that actually perform.

The accounts that see strong Display ROAS are not running fundamentally different campaigns. They have simply done the work of identifying what doesn't work and systematically eliminating it — allowing budget to concentrate on the placements that do.

For context on how Display fits into a broader paid media strategy, including Performance Max placement exclusions, see our guide on PPC trends and account structure.

How to Find and Review Placement Reports in Google Ads

The placement report is the primary tool for identifying where your budget is going on the Display Network. Most advertisers either never look at it or check it once and forget to return. Neither approach is sustainable.

Accessing the Placement Report

• In Google Ads, navigate to Campaigns → Content → Where Ads Showed
• This report lists every placement where your ads have appeared: websites, apps, YouTube channels
• Available at the campaign level and at the account level — always check both
• Default date range is often too short — set to at least 30 days, ideally 60–90 days, to have statistically meaningful data

Sorting and Filtering for Action

The raw placement report contains too many rows to review manually. Sort and filter to surface the highest-priority exclusions:

• Sort by Cost descending — reveals where the most budget has gone. Any high-spend placement with low conversions is an immediate candidate.
• Filter for Conversions = 0, Clicks > 15 — these placements have received significant engagement with no business outcome.
• Filter for Cost per Conversion > 3x your target CPA — placements that are converting but at unacceptable cost.
• Sort by Impressions descending, then filter for CTR > 5% — abnormally high CTR often indicates accidental click farming, especially in app inventory.

What to Do With the Report

Export the filtered results as a CSV. Review each placement: Is this a real website in a relevant category? Is this an app? Is this a YouTube channel? Could a legitimate prospect encounter my ad here and be in a relevant mindset to engage? Anything that fails this test goes on the exclusion list.

Track your exclusions in a shared document — not just inside Google Ads. This creates a record that informs future campaigns and can be shared with clients or team members who join later.

The Worst Placement Categories to Block Immediately

Some placement categories are bad for almost every advertiser in almost every campaign type. Blocking these proactively — before spending significant budget — is one of the highest-ROI actions available when launching a new Display campaign.

Content Categories to Exclude at Account Level

• Sexually suggestive content — brand safety risk in virtually every industry
• Tragedy, conflict, and sensitive social issues — high impressions, near-zero conversion intent, negative brand association
• Profanity and rough language — typically attracts entertainment-mode browsing with no purchase intent
• Drugs, tobacco, and weapons (where legal) — even where the content is legal, the audience intent rarely aligns with commercial conversion
• Parked domains — these are placeholder pages with no real audience; clicks are almost entirely accidental or bot-generated
• Error pages and non-standard content — similar to parked domains; no real audience

Placement Types to Audit Immediately

• Foreign-language sites irrelevant to your market — if you sell to English-speaking markets, traffic from content in unrelated languages will not convert
• Content farm domains — sites with generic, auto-generated content designed primarily to host ads rather than serve a real audience
• Forum threads on unrelated topics — high impressions, low purchase intent, often driven by broad keyword contextual matching
• Generic news aggregator placements — visitors in news-reading mode are in a different mindset than visitors actively researching a purchase

These category-level blocks can be set in Google Ads under Tools & Settings → Brand Safety → Excluded content at the account level, or within individual campaign settings. Account-level settings apply universally — campaign-level can be used for exceptions.

Mobile App Placements — The Most Misunderstood Display Problem

Mobile app placements are the single largest source of wasted Display Network spend in the accounts we audit. They are also the least discussed. Most advertisers know they should block "bad websites." Very few have systematically addressed app inventory — and it often accounts for 30–50% of Display spend in campaigns that haven't been managed.

Why App Placements Are a Distinct Problem

App placements differ from website placements in a critical way: the click environment. On a website, a user sees your ad while actively browsing content related (or adjacent) to their intent. In a mobile app — especially a game — a user is focused on the app itself. Banner ads in games are primarily encountered during loading screens, between levels, or in forced-view formats where the user is waiting rather than browsing. This generates clicks that are:

• Accidental — fat-finger clicks on small ads adjacent to game controls
• Incentivized — some apps reward users for watching or clicking ads, generating zero genuine interest
• Low-intent — the user was playing a game, not researching your product category
• Demographically misaligned — children's game apps generate adult ad clicks from non-adult users

How to Block Mobile App Placements

There are multiple levels at which app placements can be excluded:

• App category exclusions: In Google Ads, go to your campaign → Exclusions → add "Mobile app categories" → exclude Games, and any other categories irrelevant to your audience. This is the fastest first step.
• All-app exclusion: In your account's Shared Library under Placement Exclusion Lists, add the exclusion target "mobileappcategory::69500" to exclude all apps universally across campaigns that use the list. This is appropriate for most B2B and high-consideration B2C campaigns.
• Individual app exclusions: From the placement report, filter for rows where the "Placement type" column shows "Mobile app" and exclude the highest-spend non-converting apps individually. Keep a running list of these in your exclusion document.
• Device targeting adjustment: As a complement (not a replacement) to app exclusions, consider reducing mobile bid adjustments by 20–40% in campaigns where mobile historically underperforms — this reduces overall app inventory exposure while maintaining presence.

Accounts that block mobile app placements reduce average CPCs by 22% on average, because app inventory inflates the average by generating high-click-volume, low-cost-per-click traffic that looks efficient in isolation but contributes nothing to conversion volume.

Building an Account-Level Exclusion List

Campaign-level placement exclusions are the starting point most advertisers use. Account-level exclusion lists are the approach that scales — and the difference matters significantly as an account grows beyond one or two campaigns.

Campaign-Level vs. Account-Level Exclusions

When you exclude a placement at the campaign level, it applies only to that campaign. When you add a new Display campaign next month, you start from scratch. Every known bad placement has to be re-excluded manually. In accounts with multiple campaigns, this means the same bad placement often continues to consume budget in newly launched campaigns for weeks before anyone catches it.

Account-level exclusion lists solve this. A shared exclusion list is created once, populated with known bad placements, and then attached to every Display campaign in the account. When you add a new campaign, you attach the list — and it inherits every exclusion that has been accumulated over all previous campaigns.

How to Create and Manage an Account-Level Exclusion List

• In Google Ads: Tools & Settings → Shared Library → Placement Exclusion Lists → Create List
• Name it something version-controlled: "Account Exclusions — Master — [date last updated]"
• Add your initial batch of known bad placements, app categories, and content farms
• Attach the list to every existing Display campaign: open each campaign → Content → Exclusions → Use Exclusion List → select your master list
• Set a calendar reminder to update the list every two weeks with new exclusions from the placement report

What to Include in the Master Exclusion List

• All content category blocks (sensitive content, parked domains, error pages)
• App category: Games (at minimum); all apps if your campaign type doesn't benefit from app inventory
• Specific high-spend, zero-conversion domains discovered in placement reports
• Competitor domains if you don't want to appear on their owned or adjacent inventory
• Your own domain — to prevent retargeting loops where existing visitors who have already converted keep seeing prospecting ads

Maintain a parallel CSV document outside of Google Ads with the same exclusion list. This creates a backup, allows team members to review and contribute, and can be imported into a new account if the business scales into additional Google Ads accounts.

Also see our article on understanding the channel performance report for how Display exclusions interact with Performance Max placement management.

Display Targeting Strategy: How to Combine Placement Blocks With Audience Targeting

Placement blocking is necessary but not sufficient. An account that has eliminated bad placements but has no audience targeting in place is still serving ads to everyone who happens to visit any remaining placement — regardless of whether they are anywhere near your target customer profile.

The highest-performing Display campaigns we manage combine placement quality management with deliberate audience targeting. The result is not just fewer bad impressions — it is more of the right impressions, concentrated on users who have shown behavioral signals relevant to your offer.

Audience Layers That Work in Display

• Custom intent audiences — built from keywords that signal active research in your category. Users who have recently searched these terms across Google properties. This is the closest Display can get to search-intent targeting.
• In-market audiences — Google's predefined segments of users showing purchase intent signals in specific categories. Use as a starting layer; refine based on conversion data over time.
• Remarketing from GA4 — users who visited your site, engaged with key pages, or triggered specific events (add to cart, began checkout). The most reliable conversion audience available in Display.
• Customer match — uploading your own email list to target known contacts across Display inventory. Useful for upsell and retention campaigns where you want to reach existing customers outside of email.
• Similar segments — Google's lookalike-style audiences built from your remarketing lists. Variable quality; test against in-market segments before scaling.

Targeting Mode: Observation vs. Targeting

In Google Ads, audiences can be added in two modes. Observation mode does not restrict who sees your ads — it adds the audience purely for data collection and bid adjustment. Targeting mode restricts delivery exclusively to users who match the audience definition.

For prospecting campaigns, observation mode with bid adjustments is often the better starting point — it allows you to see how different audience segments perform before committing to full targeting restrictions. For remarketing campaigns, targeting mode is almost always appropriate — you only want to spend on users who have already engaged with your brand.

The Combined Approach in Practice

The Display strategy we recommend for advertisers with established accounts has three layers working together:

• Placement quality layer: Account-level exclusion list removing bad categories, apps, and known underperformers. Updated bi-weekly.
• Audience targeting layer: Custom intent + in-market audiences for prospecting; GA4 remarketing segments for lower-funnel campaigns.
• Creative relevance layer: Ad creative matched to audience intent level. Prospecting creative introduces the brand. Remarketing creative references specific products, pages, or offers the user already engaged with.

When these three layers are aligned, Display campaigns deliver consistent results at predictable costs. Without the placement quality layer, audience targeting alone cannot overcome the budget drain of low-quality inventory. Without audience targeting, placement blocking alone cannot overcome the intent mismatch of reaching unqualified users on otherwise acceptable sites.

If you want support building a complete Display strategy — from placement management through audience architecture and creative — our team handles all three layers as part of an integrated Google Ads engagement.