Google Shopping CSS in Europe: What Agencies Should Know
Comparison Shopping Services (CSS) reduce Shopping CPCs in Europe. Here's how CSS works and whether it makes sense for your clients.
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What Is CSS in Google Shopping?
In the European Economic Area (EEA), Google Shopping ads can be served by Comparison Shopping Services (CSS) instead of directly by Google Shopping. CSS partners have access to lower CPCs — typically 20% lower — because Google provides a rebate to account for the difference between paying for an ad click and paying for a CSS referral.
This means advertisers using a CSS partner in Europe pay less per click for the same ad position.
How the Discount Works
When you run Shopping ads through Google's own Shopping (google.com/shopping), you pay standard CPCs. When you run through a CSS partner, Google passes approximately 20% savings to the CSS, which can be passed to you.
In practice, advertisers running through CSS typically see 15–20% lower CPCs at the same position and impression volume.
Who This Affects
Only relevant if you're running Shopping ads targeting EEA countries: Germany, France, Netherlands, UK (still supported post-Brexit), Austria, Belgium, Sweden, and others.
If you only advertise in the US, CSS is irrelevant.
How Agencies Use CSS
An agency can become a registered CSS partner, allowing them to serve Shopping ads for all their clients through their CSS. This benefits clients with lower CPCs and gives the agency more direct control over the Shopping infrastructure.
Alternatively, agencies can use an existing CSS partner (there are dozens in Europe: Kelkoo, Idealo, PriceRunner, and many smaller providers).
Setting Up CSS
- •Register as a CSS partner at google.com/comparison-shopping-services (for becoming a partner)
- •Or create a Google Ads account and link it to an approved CSS provider
- •Create Shopping campaigns in that Google Ads account — they'll serve through the CSS
The product data still comes from Google Merchant Center. CSS affects the ad serving infrastructure, not the feed.
Cost Consideration
Some CSS providers charge a monthly fee or take a portion of the CPC savings. Evaluate the cost against the CPC savings for your specific spend volume. At low spend levels, the savings may not justify a flat monthly fee.