Google Shopping ads are the product listings with a photo, a price and a store name that show up at the top of search results. The important thing to understand is that you do not bid on keywords in Shopping. Google reads your product feed and decides which searches your products match. Your feed is the targeting. To run them you need a Merchant Center account, a product feed, and a Google Ads account linked to it.
That one fact changes how you optimize. In a Search campaign, you pick the words you want to show up for. In Shopping, you cannot. You can only describe your products well enough that Google matches them correctly, and add negative keywords to block the searches you do not want.
Most people running Shopping ads spend their time adjusting bids and budgets. The feed is where the real gains are, and it is usually the part nobody has touched since it was set up.
How do Google Shopping ads actually work?
Someone searches for a product. Google looks at every product feed it has, picks the products it thinks match, and runs an auction between them. The winners show as product listings.
Google’s own documentation on Shopping ads confirms the setup requirement: product data lives in Merchant Center, and the campaign lives in Google Ads. The two accounts have to be linked before anything runs.
The chain runs like this. Product data goes into Merchant Center, Merchant Center checks it for errors, and Google Ads pulls the approved products into a campaign. If your data is thin or wrong, you either do not get matched at all, or you get matched to the wrong searches and pay for clicks that never convert.
What do you need before you can run Shopping ads?
Three things, and all three have to be working. Missing any one of them means nothing serves.
- A Google Merchant Center account. This is where your product data lives and where Google tells you what is broken. It also requires your site to have visible contact details, a return policy and working checkout.
- A product feed. A file or a live connection that lists every product with its attributes. Most ecommerce platforms can generate one, but the default output is usually mediocre.
- A linked Google Ads account. Without the link, Merchant Center has products and Google Ads has nothing to advertise.
Getting these three connected takes an afternoon. Getting the feed genuinely good takes longer, and it is the part that decides whether the campaigns work.
What is a product feed and which fields matter most?
A product feed is a structured list of your products with an attribute for each field: title, description, price, image, availability, and more. Google reads these fields to decide what your product is and which searches it should appear for.
Not all fields carry the same weight. Here are the ones that do the heavy lifting, and the mistake we see most often on each.
| Feed field | What it does | Common mistake |
|---|---|---|
| Title | The single strongest matching signal. Google reads it to work out what the product is. | Using the internal product name, like “The Ranger” with no mention of what it is. |
| Product type | Your own category path. You control it, and it helps you group and bid. | Leaving it blank, or using one flat category for the whole catalog. |
| Google product category | Google’s own taxonomy. Affects which searches you are eligible for. | Picking a top level category instead of the most specific one available. |
| GTIN | The barcode number. Helps Google identify the exact product and match it to demand. | Omitting it on branded products, which limits eligibility and comparison. |
| Image link | The image is most of the ad. It drives whether anyone clicks. | Low resolution shots, watermarks, or promotional text burned into the image. |
| Price | Has to match the price on the landing page exactly, including currency. | Sale prices updating on site but not in the feed, which causes disapprovals. |
| Availability | Tells Google whether the item is in stock. | Stale feeds that keep advertising items that sold out days ago. |
| Description | Secondary matching signal, especially for longer searches. | Copying marketing fluff instead of the actual specs people search for. |
What this means for you: if you only have time to fix two things this month, fix titles and availability. Titles decide what you get matched to. Availability decides whether you pay for clicks on products you cannot ship.
How do you write product titles that get matched?
Front load the words people actually type. Google gives more weight to the start of the title, and long titles get cut off in the listing, so the first few words have to carry the meaning.
A workable pattern for most catalogs is: brand, product type, key attribute, then size or color. So “Acme Waterproof Hiking Boot, Full Grain Leather, Men’s Size 10” rather than “Acme Ranger Boot”.
A few rules that hold up across categories:
- Name the product type in plain words. If someone would call it a “running jacket”, the title should say running jacket, not “performance shell”.
- Include the attributes people search with: size, color, capacity, material, pack quantity, compatibility.
- Do not stuff keywords. Repeated words and irrelevant terms can get products disapproved.
- Do not put promotional text in the title. No “Free Shipping”, no “Sale”, no all caps.
- Match how buyers describe it, not how your supplier catalog describes it.
This is unglamorous work, and it is the highest return work in most Shopping accounts. A badly titled product is invisible no matter what you bid.
Why does feed quality beat bidding?
Bidding only decides what you pay once you are already eligible for a search. Feed quality decides whether you are eligible at all.
You can raise a bid by 50% and still lose, because Google never matched that product to that search in the first place. Fixing the title so it matches how people search puts the product into auctions it was previously locked out of. That is a bigger change than any bid adjustment.
It runs the other way too. A vague title gets you matched to broad, unqualified searches, and you pay for those clicks. Tightening the title cuts wasted spend without you touching a bid.
How do you use negative keywords in Shopping?
Negative keywords are the only direct keyword control you get in Shopping. You cannot tell Google which searches to show for, but you can tell it which ones to stop showing for.
This matters more once you move to automated bidding, because Google’s Smart Bidding will happily chase conversions on searches you never wanted in the first place. Negatives are how you keep it inside the lines.
Pull your search terms report regularly, and block the patterns that never convert. The usual suspects across ecommerce accounts:
- Research terms: “how to”, “what is”, “reviews”, “vs”, “comparison”.
- Free and cheap intent: “free”, “cheap”, “discount code”, “coupon”.
- Wrong stage or wrong product: “used”, “second hand”, “repair”, “parts”, “rental”, “diy”.
- Competitor brand names you have no business ranking against.
- Job and career searches, which quietly drain budget in some categories.
Add negatives at campaign level, and use a shared list across the account so you are not maintaining the same list in five places.
How should you structure Shopping campaigns?
Do not put your entire catalog in one campaign with one budget. If you do, your best sellers and your dead stock compete for the same money, and the products that already sell will soak up the budget while nothing else gets tested.
Two structures work well for most stores. Split by margin, so high margin products can carry a more aggressive target than thin margin ones. Or split by priority, so your proven sellers get their own campaign and budget, and everything else runs in a second campaign at a lower target.
Either way, use listing groups to subdivide by product type or brand inside the campaign. Without that, you get one blended number and no idea which products are carrying it. Our guide to ecommerce PPC strategy covers where this fits in the wider plan.
How do Shopping ads compare to Performance Max?
Performance Max uses the same product feed but runs across Search, Shopping, YouTube, Display, Discover, Gmail and Maps, with Google automating most of the decisions. Standard Shopping keeps you on Shopping inventory with more visible control. The feed matters more in Performance Max, because you have fewer other levers. Our Performance Max guide covers when it works and when it burns money.
How do you know if Shopping is working?
Judge it on return on ad spend and on profit, not on clicks or conversion volume. A campaign can double its conversions and still lose you money if the products converting are your thinnest margin items.
Work out your floor first. Our explainers on what ROAS is and break even ROAS give you the math. Once you know the number you cannot go below, every bidding decision gets simpler.
Common questions
Do I need a website to run Google Shopping ads?
Yes. Merchant Center requires a working ecommerce site with visible pricing, checkout, contact details and a return policy. You cannot run Shopping ads to a marketplace listing or a social page.
Can I choose keywords for Shopping ads?
No. Google matches searches to your products using your product feed, not a keyword list you supply. Your only keyword level control is negative keywords, which block searches you do not want.
Why are my products disapproved in Merchant Center?
The most common causes are a price mismatch between the feed and the landing page, a missing GTIN, an image that breaks Google’s rules, or a site policy issue like no return policy. Merchant Center names the specific reason for each product, so start there.
How often should the product feed update?
Daily at minimum, and more often if your prices or stock move fast. A feed that updates weekly will have you paying for clicks on sold out items and risking disapprovals every time you run a sale.
Should I run Shopping ads or Performance Max?
If you have clean feed data and solid conversion history, Performance Max usually reaches more places. If you are new, have a messy feed, or want to see exactly where money goes while you fix things, standard Shopping gives you more visible control.
Want someone to look at your feed?
If your Shopping campaigns are running but the numbers are not adding up, the feed is the first place worth checking, not the bids. Our ecommerce advertising team can review your feed and campaign structure and tell you which products are being matched badly and where budget is leaking.
No pitch and no commitment. Get in touch and we will walk you through what we find.
