Click fraud is the deliberate clicking of pay-per-click ads with no genuine interest in what is advertised, either to waste an advertiser’s money or to earn revenue for whoever hosts the ad. It can be done by people, such as a competitor or a paid click farm, or by automated software. Google groups it with accidental and low-quality clicks under the wider label of invalid clicks.
How click fraud works
Because PPC advertisers pay for each click, anyone who generates clicks can cost an advertiser money. The common sources are:
- Competitors clicking your search ads by hand to use up your daily budget early, so their own ads face less competition later in the day.
- Publisher fraud on the Display Network or partner sites, where a site owner inflates clicks on ads shown on their pages to earn a larger share of the revenue.
- Bots and click farms that imitate human behaviour across many devices and IP addresses.
Google runs automated filters on every click and removes those it judges invalid before you are charged. Some are caught later through investigation and refunded as credits. You can see how many clicks were filtered by adding the “Invalid clicks” and “Invalid click rate” columns to your campaign report.
Why it matters
Every pound spent on a fraudulent click is a pound not spent reaching a real customer, and fraudulent clicks also pollute your data. Fake clicks that never convert make keywords or placements look worse than they are; bots that fill in forms create fake leads that waste your sales team’s time and can mislead Smart Bidding into chasing the wrong traffic.
It is worth keeping in proportion, though. Most small UK businesses that suspect click fraud are actually seeing ordinary low-quality traffic: broad keywords matching irrelevant searches, Display placements in mobile games, or search partner sites that send curious but uninterested visitors. Those problems are far more common and far easier to fix than organised fraud.
Common mistakes
- Blaming fraud for every spike in clicks without first checking the search terms report and placement report.
- Buying a third-party fraud tool on the strength of alarming claims before looking at the free data already in the account.
- Excluding large ranges of IP addresses, which can block real customers on shared mobile or office networks.
- Leaving the Display Network and search partners switched on in a Search campaign without reviewing where clicks come from.
- Counting form fills as conversions without any spam protection, so bot submissions feed the bidding algorithm.
How to act on it
Start with the evidence you already have. Add the invalid clicks columns, then look at the search terms report, the placement report for Display and Performance Max, and the time of day and location data. Unusual patterns, such as many clicks from one town where you do not trade, clicks bunched at the same minute each morning, or a spike in form submissions with junk details, point to a cause.
Then tighten what you can control. Use placement exclusions for poor sites and apps, review network settings, set accurate location targeting, protect forms with spam filtering, and add IP exclusions only for addresses you can clearly tie to repeated abuse. If you still believe you have been charged for invalid activity, request an investigation from Google with dates and evidence. Checking traffic quality is a routine part of the PPC management I provide.