How it works

Google CSS vs The CSS Partner: same ads, lower CPC

Clara-Clean skraldespand 3x18L — 04Side by side
**Google's CSS vs. The CSS Partner** Same ad, same product, same price, same budget (4.000 €/mo). The only difference is the CSS provider: via The CSS Partner the CPC drops from 1.32 € to 1.05 € (−20%), so the same budget buys 2,919 → 3,649 clicks (+25%). (Numbers are examples.)

The short answer

When your Shopping ads run through Google's own CSS, Google takes a margin before your bid enters the auction. When they run through an authorised third-party CSS like The CSS Partner, your full bid enters the auction directly.

Same ad. Same placement. Same product. Same price for your customer. Around 20% lower cost-per-click for you.

Google AdsInvoice · excerpt (example)

Clicks2.919unchanged

Conversions312unchanged

CSS providerTheCSSPartneractive

Avg. CPC on the invoice1.32 € → 1.05 €−20%

08Invoice proof

The saving lands on the ad invoice Same clicks, same conversions, but with TheCSSPartner as CSS provider the average CPC drops ~20%. The proof sits on the webshop's Google Ads invoice, not in anything the customer sees. (Numbers are examples.)

Side by side

	Google CSS (default)	The CSS Partner
Ad placement	Same	Same
Products shown	Same	Same
Prices shown to shoppers	Same	Same
Ad appearance	Same	Same
Google Ads account control	Yours	Yours
Campaign management	Yours	Yours
Merchant Center access	Yours	Yours
Cost-per-click	Standard rate	~20% lower
What appears in the grey provider line	Google	Your CSS provider
Monthly cost	Included in your CPC	20 €/month
Countries covered	All	All 21 European CSS markets

4,2×

Google's
own CSS

+25%ROAS

5,3×

The CSS
Partner

12ROAS lift

Same revenue, lower cost A lower cost per click with no change in sales lifts the return on your ad spend (ROAS) by roughly 25%. The same ads work harder, because every click costs less. (Numbers are examples.)

What the provider line looks like

Below each Google Shopping ad, there is a small grey line of text that shows the source of the listing. When you run through Google directly, that line typically reads "Google". When you run through The CSS Partner, it reads your CSS provider name.

That is the only visible difference to anyone looking at the ads.

Shoppers do not see a difference in the ads themselves. They see the same product, the same image, the same title, the same price. The grey provider line is small and most shoppers do not notice it at all.

Why does Google allow this?

Google does not just allow it. Google is required to offer it.

In June 2017, the European Commission ruled that Google had abused its dominant position by giving its own Google Shopping service preferential treatment in search results (case AT.39740, fine: EUR 2.42 billion). The remedy required Google to open the Shopping auction to authorised Comparison Shopping Services on equal terms.

"Equal terms" means that when an authorised CSS submits a bid on behalf of a merchant, it enters the same auction infrastructure that Google's own Shopping uses. The ~20% saving exists because the margin Google would otherwise take is not taken when the bid comes through a CSS.

The Court of Justice of the EU confirmed the Commission's decision in 2024. This is settled law, not a loophole.

Is this too good to be true?

It is a fair question. The honest answer is: no, and here is why.

The mechanism is real, it is regulated, and it has been in operation since 2017. Thousands of webshops across Europe use authorised CSS providers. You can verify that The CSS Partner is live and active right now: search for one of our merchants on Google Shopping and you will see our CSS provider name in the grey line beneath the ad.

The only thing that sounds surprising is that most webshops have never heard of it. That is partly a Google awareness issue, partly a market education issue, and partly why we exist.

What does NOT change

Your Google Ads account remains entirely under your control. We do not touch your campaigns, bids, budgets or targeting. We connect at the Merchant Center level only, which determines which CSS your Shopping ads run through.

You keep all your campaign history, Quality Scores and performance data. There is no relearning phase for the algorithm. Your campaigns keep running exactly as configured.

Switching takes one business day

If you run through Google's CSS today, switching to The CSS Partner takes 24 hours and requires one approval click from you in Merchant Center. Your campaigns stay live throughout.

If you later want to switch back, the same process works in reverse. No contract, no lock-in.

Common questions

Does switching CSS affect my ad ranking or Quality Score?

No. CSS selection is a routing decision, not a quality signal. Your historical performance data, Quality Scores and campaign structure are unchanged by the switch.

Can I see proof that The CSS Partner is a real, active CSS?

Yes. Search Google Shopping in any of our active markets and you will see our provider name in the provider line for our merchants. If you want to verify before signing up, we are happy to show you.

Do I need to run new campaigns or rebuild anything?

No. Your existing campaigns continue running. The switch happens at the infrastructure level below your campaigns.

What if Google changes the CSS programme?

The CSS programme is established by EU regulatory order. Google cannot unilaterally remove it. Programme terms can evolve, but the structural requirement to offer CSS access has been upheld through legal challenge and is in active operation across 21 European CSS markets.

Is The CSS Partner the same as a Google Partner agency?

No. These are different things. A Google Partner agency manages your Google Ads campaigns on your behalf. A CSS is a separate programme that determines the routing of your Shopping bids into the auction. You can use a CSS while managing your own ads, while working with any agency, or while using any other tool.

Same ads. Lower CPC. Live in 24 hours.

Switch from Google's CSS to The CSS Partner with one approval click. No contract.

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