When a Shopping campaign plateaus, the reflex is to touch the bids or the budget. That is rarely where the problem lies. Without keywords, Google has a single source to understand what you sell: your product feed. A poor feed means a misunderstood product, shown on the wrong searches, or not shown at all.
What Google reads in your feed
For each product, Google cross-checks the title, the description, the category, the attributes (color, size, material, brand) and the landing page. These fields are what it uses to match a product with a search. The bid then decides how much you are willing to pay, but only on the searches where your product was judged relevant.
In other words: an incomplete feed shrinks the playing field before the bid even comes into play.
The same feed powers every place your products appear: Shopping ads, Performance Max campaigns and the free listings of the Shopping tab. Fixing it once improves all of them at the same time.
Titles, the first lever
The title is the field that weighs the most. It should use the words your customers type, in the order they type them: product type, brand, distinctive feature, variant. A title written for the internal catalog matches no search at all.
Nova 40 - Brass
Nova 40 cm brass LED pendant light with built-in dimmer
Google accepts up to 150 characters, but shoppers often see only the first 70, sometimes fewer: the essentials must come first. Three things have no place in a title, and Google’s title guidelines actually forbid them:
- promotional text: prices, sales, free shipping, your store name;
- capital letters used for emphasis;
- symbols and decorative characters.
On a catalog of several hundred SKUs, you do not rewrite titles by hand: you build rules that assemble them from the attributes, for example product type, then brand, then material, then color. That is what a feed management tool like Channable is for.
Attributes and categories
Every attribute you fill in is one more reason to appear on a precise search. Color, material, size, GTIN: these fields also feed the Google Shopping filters. A product without a color is less likely to show up when a shopper filters by color.
The GTIN, the product barcode, deserves a line of its own. Google recommends it for every product the manufacturer has assigned one to: it helps Google identify exactly what you sell and match it with the right searches. A product that has a GTIN and does not send it may even be disapproved.
The Google category should be as specific as possible. "Lighting" is too broad; the right branch of the taxonomy helps the algorithm rank you among the right competitors. Google assigns a category to every product from your data anyway: all the more reason for that data to be accurate.
The product type (product_type) is the other classification, your own: the one of your store, from general to specific. Google does not require it, but it is what lets you organize your bids and your reports according to your own logic.
Images and product page
The main image should show the product, and only the product. Google forbids anything that looks like advertising on it: added text, prices, "free shipping", watermarks, borders, logos that are not part of the product. It requires at least 500 × 500 pixels and recommends 1,500 × 1,500 or more. A sharp photo on a neutral background remains the safe choice.
The landing page must say the same thing as the feed: the price and currency you send must be the ones shown on the product page and at checkout. Otherwise, Google disapproves the product and flags it in Merchant Center.
That is the habit to build: a weekly look at Merchant Center, where disapproved or limited products are listed with their reason. A broken sync or a price error is quickly fixed; discovered a month later, it has cost a month of delivery.
The most common causes of disapproval, and the steps to get your products back online, are covered in our article Disapproved products in Merchant Center.
The takeawayOn Shopping, the bid sets the price. The feed decides the placement.
Next: structure and margin
A clean feed opens the way to the rest: a campaign structure that separates products by potential, and bidding driven by margin rather than by the ROAS the platform displays.
Custom labels (custom_label_0 to custom_label_4) are made exactly for that. Invisible to your customers, they classify your products by margin, season, sales velocity or price range, and become filters in Shopping and Performance Max. A simple "high margin" or "low margin" label is often enough to stop treating a product that earns money and a product that only brings revenue the same way.
That is the order we followed for Lumeers: the feed first, then measurement, then structure. Read the Lumeers story.
To go further: the Google Ads topic, and the Agency page, which describes how we work.
Frequently asked questions
Do I need a feed management tool?
Not for twenty products. Beyond a few hundred SKUs, or as soon as you sell in several countries, a tool like Channable saves you manual fixes and applies the same rules to the whole catalog.
My products have no GTIN: is that a problem?
No, if the manufacturer never assigned one. That is often the case for a private label: you leave the field empty and provide the brand and the manufacturer part number (MPN) instead. A product that does have a GTIN, however, must send it, or Google may disapprove it.
How long before we see an effect?
Changes apply as soon as Google has reprocessed your products. We first watch impressions and clicks, then judge revenue over several weeks to smooth out the variations.
Is the feed enough without clean tracking?
No. The feed decides where your products appear; tracking tells Google which ones sell. If conversions are reported poorly, the algorithm optimizes on incomplete data.