Does Google protect you from click fraud? What it covers, and what it leaves to you

Yes, Google protects you from some click fraud, automatically, and you don't pay for what it catches. But its own help page is plain that its filters can't block traffic from your site, because they run after an ad serves. It doesn't apply your own rules either, and a fake lead you report as a conversion becomes data your bidding learns from. Whether you need more depends on what your own data shows, and you can check that in an afternoon.

What Google does for you

• It filters invalid clicks before billing. The Invalid clicks column in your campaign reports shows the traffic Google's systems filtered, and Google doesn't charge for those clicks.
• It credits what it finds later. If Google detects invalid traffic after you've been billed, it issues a credit for that traffic when appropriate and possible. The credit line items in your billing show the original month and campaign.
• It investigates on request. If you believe invalid traffic slipped through, you can ask Google to review activity from the last 60 days.

Google also makes a point every advertiser should hear: third-party tools may flag traffic, such as duplicate IP addresses or bot activity, that Google had already filtered and excluded from your bill. A tool that counts those as losses is counting money you never spent.

What it leaves to you

• What happened on your site. Google's reports show the click. Your site holds the visit: whether anyone read the page, filled in the form or bought. When Google investigates, its checklist asks you for the IP addresses behind repetitive clicks from your own web server logs.
• Your own rules. Google decides what counts as invalid by its own criteria. A rule like “no more than five clicks a week from one visitor” is yours to set and enforce.
• Your exclusion lists. IP exclusions are a tool you manage, with 500 entries per list. Google doesn't fill them in for you. See how to spend the 500 slots.
• What your bidding learns from. Google's advice on invalid leads is to protect your forms, with reCAPTCHA, server-side validation and double opt-in, and to optimize for qualified-lead goals. A bot that submits your form is recorded as a conversion, and Smart Bidding looks for more traffic like it. See fake leads from Google Ads.

Sources: Google Ads Help, About invalid traffic and Prevent invalid leads.

Do you need more? A practical test

1. Read your Invalid clicks column for the last few months. That is what Google already caught for you.
2. Check your leads or orders against what your ad account reports. Fake names, numbers that never answer and orders that never pay are the losses Google's filtering doesn't touch.
3. Look for repeat sources on your site: the same visitor arriving from your ads again and again, or bursts from datacenter networks. Our guide to the same IP clicking your ads covers how to read them.

If Google's filtering covers what you find and your leads are real, you may not need anything more. If you find fake conversions, repeat sources or bots reaching your checkout, a layer on your own site is what deals with them.

Where AdProtektor fits

• It sees the visit. AdProtektor scores each visit to your site and keeps the evidence behind every verdict, with a persistent identity for each visitor that belongs to one browser on one device and survives IP changes.
• It applies your rules. Click-frequency rules act on repeat arrivals from your ads within the window you set, and blocked sources go on your Google Ads IP exclusion lists automatically.
• It protects what bidding learns. With ConversionOS and fraud protection on, a conversion from a blocked visitor is withheld instead of being sent to Google Ads, Meta or GA4.
• It supports Google's process. The Refund Report exports each flagged click with its GCLID for an investigation request, and Google decides the outcome.

To run the practical test on your own traffic, start a free trial and add the script to your site.