What is click fraud?
Click fraud is fake or invalid clicks on your pay-per-click ads. Here's where it comes from and why Google's filters don't catch all of it.
Click fraud is when someone — or something — clicks your pay-per-click ads with no intent to do business with you. Every click costs you money. Every fraudulent click costs you money for nothing.
Where the bad clicks come from
The traffic that drains your budget breaks down roughly into five buckets:
- Competitor clicks. Rivals click your ads repeatedly to burn through your daily budget so your ads stop showing and theirs keep going.
- Bots. Automated scripts generate thousands of fake clicks across campaigns. Some are crude; some mimic human behavior closely.
- Click farms. Cheap human labor paid to click ads at scale, often coordinated through messaging apps.
- Publisher fraud. Dishonest publishers on Google's Display Network click ads on their own sites to inflate revenue share.
- Accidental clicks. Poorly placed ads — especially on mobile — that get tapped by mistake.
The scale of the problem
Click fraud isn't a fringe issue. Industry estimates put it like this:
| Metric | Estimate |
|---|---|
| Global ad fraud losses | $100B+ annually |
| Invalid clicks on Search | 10–15% |
| Invalid clicks on Display | 25–35% |
| PPC campaigns affected | Nearly all |
A meaningful chunk of your ad budget is going to traffic that will never convert. The question is how big the chunk is for your account.
Two tiers Google recognizes
Google itself classifies invalid traffic into two tiers:
General Invalid Traffic (GIVT) — Routine bots, spiders, crawlers, data-center traffic. Google filters most of this automatically.
Sophisticated Invalid Traffic (SIVT) — Harder-to-detect fraud that mimics humans: hijacked devices, advanced bots, incentivized clicks, coordinated schemes. This is where most advertiser losses happen because Google's filters miss the bulk of it.
Who gets hit hardest
Click fraud affects every advertiser, but some are bigger targets:
- High-CPC industries — Legal, insurance, finance, B2B SaaS pay $5–$50+ per click. Every fraudulent click hurts more.
- Local businesses — Direct competitors in the same market have an obvious financial motive to click.
- Agencies — Managing multiple client accounts means fraud across portfolios compounds losses and erodes trust.
- Display and video campaigns — Much higher invalid-traffic rates than search.
Why Google's filters aren't enough
Google does detect invalid clicks, but the protection is partial:
- Filters focus on obvious bots and data-center traffic — they miss most SIVT.
- Refunds for detected invalid clicks are partial and arrive late.
- The model is reactive — Google reimburses after the click is paid for, not before.
- You get limited transparency into what was filtered and why.
The gap between what Google catches and what's actually fraud is the gap ClickFortify exists to close.
What happens next
- How click fraud affects your ads — concrete impact in numbers.
- How ClickFortify protects you — what the platform does about it.