Open the Products tab in Merchant Center and sort by impressions. Near the top you will usually find a bestseller called something like "The Everyday Tote" with plenty of impressions and almost no clicks, and further down, a product with a long, plain title like "Women's Canvas Tote Bag with Zip, Navy, Large" quietly converting on searches nobody planned for. The difference between those two rows is not bidding. It is the data in the feed, and that is what Google Shopping feed optimization fixes.
Short version: In Google Shopping and Performance Max there are no keywords. Google decides which searches your products match by reading your product feed, so the feed is your targeting. Optimizing titles and attributes is the highest-impact work in the whole account, and most stores never touch it. This guide shows you what to fix first, how to write titles by category, which attributes matter, and how to run feed optimization as a repeatable process rather than a one-off cleanup.
Ask most store owners what controls their Shopping performance and they will say bids or budget. Those matter, but they are downstream. The thing that actually decides whether your product shows up for a valuable search is the data you send Google about that product. A neglected feed quietly caps everything above it, and no amount of bidding cleverness rescues a feed that does not tell Google what you sell.
Why the feed is your targeting
In a Search campaign you pick keywords. In Shopping and Performance Max you do not. Google reads your product titles, descriptions, and attributes, then matches your products to searches it thinks are relevant. That means your feed is doing the job keywords do everywhere else. If the title is vague, Google matches you to vague, low-value searches. If the title is precise, you show up where buyers actually are.
This is also why Google Shopping feed optimization is not a one-time project. Every new product, every price change, and every seasonal shift changes what the feed says. The stores that keep winning treat the feed as a living part of the account, reviewed on a schedule like search terms and budgets. For the bigger argument on why this asset is so often neglected, see our piece on the most ignored asset in Google Ads.
Product titles: the biggest lever in feed optimization
The title carries the most weight in how Google matches your product, and it is where most feeds leave money on the table. The rule is simple: front-load the words a real buyer would type.
Put the important words first
Google and shoppers both scan the start of a title, and in most placements only the first part of a long title is visible. A title like "Premium Comfort - Our Bestseller" tells Google nothing. A title like "Men's Waterproof Leather Hiking Boots - Brown - Size 10" tells it exactly what the product is and which searches it should match. Lead with product type, then the attributes buyers search on.
Match the structure to how the category is searched
Different categories are searched differently. Apparel buyers search brand, gender, product, color, size. Electronics buyers search brand, model, spec. Look at how your own category is searched and mirror that order in your titles. The closer your title reads to a real search query, the better you match.
Use the space, but do not stuff
You have up to 150 characters. Fill them with real, useful detail (material, color, size, key feature, use case), not repeated keywords. Google's product data specification asks you not to include promotional text such as "free shipping" or "sale" in titles, and not to write them in all capitals. Enrich, do not spam.
Title formulas by category
A title formula turns title writing from a creative task into a template you can apply across hundreds of products. These are starting points; adjust them to the way your own buyers search, which your search terms report will tell you.
| Category | Title formula | Example |
|---|---|---|
| Apparel | Brand + Gender + Product type + Material or style + Color + Size | Brand Women's Linen Wide Leg Trousers, Sage, Size 12 |
| Footwear | Brand + Gender + Product type + Key feature + Color + Size | Brand Men's Waterproof Trail Running Shoes, Black, UK 9 |
| Electronics | Brand + Model + Product type + Key spec | Brand X200 Wireless Earbuds, Noise Cancelling, 30 Hour Battery |
| Home and furniture | Product type + Material + Size or dimensions + Color + Brand | Solid Oak Dining Table, 6 Seater, 180cm, Natural, Brand |
| Beauty | Brand + Product type + Key benefit or ingredient + Size | Brand Vitamin C Face Serum, Brightening, 30ml |
| Parts and accessories | Brand + Part type + Compatibility + Part number | Brand Front Brake Pads for Model Year Range, Part 12345 |
Whether the brand comes first depends on how much your brand is searched. A well-known brand belongs at the front because people search for it. An unknown brand often works better at the end, so the product type leads and carries the match.
Shopping feed attributes that quietly decide your reach
Beyond the title, a set of attributes tells Google how to categorize and match your products. The ones that matter most for coverage:
- Product type and Google product category. These place your product in the right part of Google's taxonomy. Google assigns a Google product category automatically, but you can set it yourself when the automatic choice is wrong. Product type is your own category path, and it is also useful for structuring campaigns.
- GTIN, brand, and MPN. These identifiers help Google understand exactly what you are selling and match you against branded and model-specific searches. If a product genuinely has no GTIN, for example custom or handmade items, the identifier exists attribute tells Google so.
- Color, size, material, gender, age group. These power the filtered searches buyers use, and they feed the variant structure that decides which version of a product shows. For apparel sold in the US, UK, Germany, France, Japan and Brazil, color, size, gender and age group are required.
- Item group ID. This links variants of the same product, such as one shirt in six sizes, so Google understands them as one item with options.
- Product highlights and description. Secondary, but they give Google more context and can influence borderline matches.
An attribute checklist you can run today
| Attribute | Why it matters | Common problem |
|---|---|---|
| title | Main matching signal and the first thing shoppers read | Brand-speak names instead of product descriptions |
| description | Extra context for matching | Copied from the title or left empty |
| google_product_category | Places the product in Google's taxonomy | Automatic category too broad or wrong |
| product_type | Your own category path, useful for campaign structure | Missing or a single generic word |
| gtin, brand, mpn | Exact product identification | Missing GTINs on branded products |
| color, size, material | Filtered searches and variants | Values hidden in the title only |
| item_group_id | Links variants together | Each variant treated as a separate product |
| custom_label_0 to 4 | Your own segments for campaigns | Unused, so campaigns cannot split by margin or price |