The Cobiro guide to Google Shopping, CSS and AI product content

Everything a European online store needs to know about getting products in front of buyers: what a Comparison Shopping Service actually does to your cost per click, what Google requires of your feed, and what the new generation of AI tooling can and cannot do with your product data.

This is a guide, not a blog. It is written to be read in order, and every page carries the whole table of contents so you can see where a single answer sits in the larger picture. Start wherever your question is.

Two things have changed for merchants in the last few years, and this guide is built around both. The EU antitrust ruling opened Google Shopping to independent Comparison Shopping Services and made a roughly 20 percent cost advantage available to any European merchant who asks for it. And generative models have made studio-grade product imagery, video and feed data something you produce in minutes rather than commission. The two meet in the same place: the product feed you send to Google.

Google CSS

What a Comparison Shopping Service is, where the roughly 20 percent cost advantage comes from, and how a merchant actually moves.

What a Comparison Shopping Service is The EU ruling that created the CSS programme, and what a CSS actually does on your behalf.
The 20 percent CPC advantage Where the discount is applied, what it is worth in a real account, and which campaign types it reaches.
Where CSS is available The 32 countries the programme covers, and what merchants outside them can and cannot do.
Switching your Merchant Center The association request step by step, and the three things to check afterwards.
The EU antitrust ruling The €2.42bn decision, the remedy it imposed, and why the advantage is durable.
Choosing a CSS partner A hundred partners, one identical discount. What is actually left to compare.
Running two CSS partners at once Split-testing providers without breaking the one-product-one-CSS rule.
Free product listings The unpaid surfaces, what a feed needs to reach them, and where AI shopping fits.
CSS for agencies Running CSS across a client base: onboarding, reporting, billing and pricing.

Whitelabel CSS

Running your own Google CSS Partner brand: the economics, the branding, the approval, and what changes past fifty clients.

What whitelabel CSS is Operating as a Google CSS Partner under your own brand, and how that differs from reselling.
The "By [your brand]" line What tens of millions of monthly branded impressions are worth, and what they would cost to buy.
The economics A flat platform fee against per-client revenue: the margin curve at 20, 50 and 100 clients.
Free clicks from the attribution link Roughly 3 percent of Shopping clicks go to the "By" link. Where they land is your choice.
Getting approved by Google CSS Center, the comparison website, the audit, and the one-to-four-week timeline.
The comparison website Google’s hard requirement: what the site has to be, and who keeps it alive.
Selling CSS to clients The one-paragraph pitch, the objections that actually come up, and the numbers to bring.
Scaling past fifty clients Where the operational cost per client actually sits once the novelty wears off.
Whitelabel for brands and retailers Why a large merchant would run its own CSS rather than sit inside someone else’s.

Google Shopping Ads

How a product in your feed becomes an ad in an auction, and which parts of that path you actually control.

How Google Shopping Ads work From feed to auction: what Google builds, what you control, and where PMax fits.
Performance Max and Shopping What PMax spends where, which part the CSS advantage reaches, and what you give up.
Standard Shopping versus Performance Max When granular control is worth more than automated reach.
Smart Bidding for retail What the strategies optimise for, what a learning period is, and what not to touch.
Measuring Shopping performance The metrics that tell you something, and how to read a before-and-after honestly.
Local Inventory Ads Store-level stock in Shopping results, and the extra feeds it needs.
Selling across several countries Currency, tax, shipping and language per market, and when to split the Merchant Center.

Product feeds

What Google requires of your product data, why items get disapproved, and what enriching a feed is worth.

Google Shopping feed requirements The attributes Google requires, the ones it rewards, and the usual causes of disapproval.
Feed enrichment Filling the attributes your catalogue never had, and what that changes in the auction.
Product titles that match The title is the keyword. What to front-load, by category, and what to leave out.
Images that win the row Your image competes with five others in the same strip. What the winners have in common.
Fixing disapprovals A triage order for the diagnostics tab, starting with the one that causes most of them.
Variants and item_group_id Getting size and colour variants to behave as one product without cannibalising each other.
GTINs and product identifiers When a GTIN is required, what to send without one, and what a wrong one costs.
Shipping and tax in the feed Where to configure them, and why an approximation here breaks something there.
Promotions and sale prices Expressing a discount without breaking price consistency.
Feed freshness and crawl timing Update frequency, the Content API, and the race between a price change and a crawl.
Shopify and platform feeds What the built-in integrations get right, what they leave empty, and where to intervene.
One catalogue, many channels What Meta, TikTok and AI shopping surfaces want that Google does not.

AI product content

Generating product images and video from what you already have, at catalogue scale, without losing the product.

Generating product images Packshots and lifestyle photography from the pictures you already have.
Generating product video Turning a still into a short clip for Meta, TikTok and Shopping surfaces.
Prompting for product photography The vocabulary that moves an output, and the words that do nothing.
Brand consistency at scale Deciding the look once, so a row of your products reads as one brand.
Reviewing generated imagery A review process that catches errors: grids not singles, and what to reject outright.
What generation still gets wrong Packaging text, logos, fine texture and geometry: the details buyers inspect.
Video formats per channel Aspect ratios, lengths, first-frame rules and safe areas, in one table.

Compliance

What European law and the ad platforms now require when the image in your ad was generated rather than photographed.

The EU AI Act and generated images The transparency rules that now apply to AI-generated product content, and what they require in a file.
Marking and metadata in practice C2PA, IPTC and watermarking, and the CDN resize that strips all three.
Platform AI policies What Google, Meta and TikTok each require of AI-generated advertising content.
Advertising law and generated imagery Misleading-advertising rules do not care how an image was made.
Generated people and GDPR Synthetic models, likeness, and what happens when a generated face resembles a real one.

Reference

The whole guide as a glossary and a checklist.

Glossary Every term this guide uses, defined once.
The setup checklist The whole guide as one ordered list you can work through.
Where our numbers come from Every statistic Cobiro cites, what it actually measures, and a link to the source.
More images, more clicks: the 32% figure What Google measured, what the number does not say, and how to act on it.
What a product image costs: the 90% figure The rate-card arithmetic: studio prices against generation, line by line.
Attribute coverage: the 41% to 96% figure What the coverage metric counts, and how to measure your own feed.

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