Guide

How to Block Bots from Google Ads: A 2026 Guide to Stopping Click Fraud

By Viktor Kuznetsov

Reviewed by Senior Media Buyers

IP blocking alone stops less than 1% of bot clicks. To block bots from Google Ads in 2026, you need behavioural detection, Performance Max compatibility, and refund recovery, capabilities that managed click-fraud services provide.

Why Blocking Bots from Google Ads Is Harder in 2026

Click fraud has evolved. In 2026, the majority of invalid clicks come from sophisticated invalid traffic (SIVT), residential proxy networks, click farms, and AI-powered agents that mimic human behaviour perfectly. Unlike simple datacenter bots, these threats rotate IPs, spoof device fingerprints, and even generate fake conversions to avoid detection.

Google's built-in invalid traffic filters catch obvious patterns, but they are not enough. Studies estimate that 14 to 25% of paid clicks are invalid, and many advertisers see even higher rates on competitive keywords. The problem is especially acute on Performance Max campaigns, where Google restricts third-party access to campaign data, making self-serve IP blockers useless.

To effectively block bots, you need a strategy that goes beyond IP lists and embraces real-time behavioural analysis, device fingerprinting, and automated refund recovery.

Detection Signals: How to Spot Bot Clicks on Google Ads

Before you can block bots, you need to identify them. Here are the most reliable signals of click fraud in Google Ads:

• Abnormal click-to-conversion ratio: High clicks with no conversions, or conversions that happen too quickly (e.g., within seconds of the ad click).
• Geographic anomalies: Clicks from locations you don't target, or from data centres and known proxy IP ranges.
• Session behaviour: Repeated clicks from the same IP or device in a short time, or clicks that never scroll or interact with the landing page.
• Time patterns: Sudden spikes in clicks at odd hours, or consistent high click volume from a small set of IPs.
• Device and browser inconsistencies: Clicks from outdated browsers, mismatched user agents, or devices that don't match the geographic region.

Google Ads provides some built-in reports, like the 'Invalid clicks' column and the 'Click quality' report, but these are often delayed and lack granularity. For real-time detection, you need third-party tools that analyse server-side data.

Practical Steps to Block Bots in Google Ads (Self-Serve)

If you're managing click fraud manually, start with these steps. They won't stop all bots, but they reduce some noise.

1. Set up Google's IP exclusions: Head over to your Google Ads account, then 'Tools & Settings' > 'Audiences, keywords, and content' > 'IP exclusions'. Add any IP ranges you suspect are malicious. The catch is, this only blocks exact IPs to modern bots can cycle through thousands of residential addresses, so you'll catch under 1% of dodgy clicks with this method.

2. Switch on automatic invalid traffic filters: Google turns these on by default, but you can also opt into 'Enhanced cost-per-click' (ECPC) and 'Target CPA' bidding. These might cut down on low-quality clicks, but they're not a sure thing.

3. Use Google Ads 'Placement exclusions': If you're running Display Network campaigns, cut out low-quality placements and apps that tend to generate bot traffic. Check your 'Placements' report every week.

4. Set up conversion tracking with a delay: Require a minimum time spent on site to say, 30 seconds to before you count a conversion. That should weed out instant bot conversions.

5. Keep an eye on your 'Click quality' report: You'll find it under 'Reports' > 'Predefined reports' > 'Basic' > 'Click quality'. Watch for a high 'Invalid click rate' and dig deeper if you spot one.

These manual steps are a decent starting point, but they're labour-intensive and won't catch the most advanced threats. For proper ongoing protection, think about a managed service.

Why DIY IP Blockers Can't Handle Modern SIVT and AI Agents

IP blocking is the go-to DIY tactic, but it's pretty useless against modern click fraud. Here's the thing:

• Residential proxies: Bots are using real home IP addresses from all over the world, so they look just like genuine users. IP blocklists rarely include residential IPs.
• IP rotation: A single bot farm can get through thousands of IPs each day, using each one just once. Blocking one IP achieves nothing.
• AI agents: By 2026, AI-powered bots can mimic human mouse movements, scroll patterns, and even fill out forms with realistic data. They can also adapt to detection rules in real time.
• Performance Max limitations: Google's PMax campaigns won't share click-level data with third-party tools. So IP blockers that rely on server-side tracking simply can't see PMax clicks. Only managed services with direct integration or post-click analysis can protect PMax campaigns.

The bottom line: IP blocking is a gimmick that gives you a false sense of security. To really block bots, you need behavioural detection and device fingerprinting that works across all campaign types.

How Managed Click-Fraud Protection Fills the Gaps

Managed click-fraud protection services, like Unled Network, offer a complete solution that DIY tools just can't match. Here's what they bring to the table:

• Behavioural analysis: They look at click patterns, session length, mouse movements, and conversion quality to spot bots in real time.
• Device fingerprinting: They build unique fingerprints using browser attributes, screen resolution, installed fonts, and more to even when IPs change.
• Performance Max coverage: Because managed services can analyse post-click behaviour on your landing page (via a JavaScript snippet), they can pick up bot clicks from PMax campaigns to the ones Google's own tools miss.
• Automated IP and device blocking: They intercept harmful sources at network level, before those sources ever hit your site.
• Refund recovery: They log invalid clicks and send Google invalid-traffic refund requests on your behalf, recouping wasted ad budget.

Managed services are particularly valuable for advertisers running high-spend campaigns on competitive terms, where click fraud hits hardest. They save both time and money, and they adapt as new threats appear.

What to Look for in a Click-Fraud Protection Service

If you choose a managed service, check for these features:

• Coverage for all campaign types: Make sure they protect Search, Display, YouTube, and Performance Max. Some services only cover Search.
• Real-time blocking: The service ought to stop bots before they can click again, not just report after the event.
• Refund recovery: Find a service that actively files Google invalid-traffic refund claims. This can reclaim 5% to 20% of your ad spend.
• No annual lock-in: Steer clear of long contracts. Click fraud requirements change, and you ought to be able to move freely.
• Transparent reporting: You should get detailed reports showing blocked clicks, saved spend, and refunds recovered.

Unled Network, for instance, offers all these features with a managed approach that covers Performance Max and modern SIVT threats. But whatever provider you pick, the key is to choose a service that keeps pace with the evolving threat landscape.

Frequently Asked Questions