What is product feed?
A product feed is a structured file or data connection listing every product you sell with its attributes, such as title, description, price, availability, image and identifiers.
Worked example, not a result
Where a feed loses products before anyone bids
Say a store connects its catalogue and submits 3,260 items. Merchant Center accepts most of them and rejects 412, leaving 2,848 that can actually appear.
The rejected items are rarely a mystery once you open the diagnostics. Missing identifiers on lines the store makes itself, images with promotional text burned into them, availability that says in stock while the page says sold out, and prices that do not match the landing page account for most of it on a typical store.
What matters is that those 412 products were invisible the whole time. No bid, no budget change and no campaign restructure touches them, because they never entered an auction. A store can spend months optimising campaigns while a whole shelf sits behind a data error.
That is why feed work comes before campaign work. The counts above are an example, but the order of operations is not.
Why it matters
The product feed is the foundation under the visitors lever for anything shopping related. Ad platforms match your listings to searches using the words and values in the feed, so the feed decides which searches you are eligible for before any bid is placed.
It also touches conversion and order value more than most stores expect. The title and image in the feed set the expectation a shopper carries onto your page, so a mismatch between the listing and the page costs conversions you already paid for. Correct availability and price stop people arriving at a product they cannot buy.
For a store owner the practical point is that feed work is cheap, permanent and compounding. Rewriting titles so they contain the words buyers actually type, fixing identifiers and cleaning images improves every campaign that uses that data, including free listings, and it keeps working after the campaign changes.
Common mistakes
- Treating the feed as an export and never looking at it again. Catalogues change constantly, and a feed nobody reviews slowly fills with items that cannot be shown.
- Using the store's own product names as titles. Internal names and style codes do not match how people search, and shopping placements match heavily on the title.
- Sending marketing images with badges or text on them. Overlay text is not allowed on shopping images and the item gets rejected rather than shown.
- Letting availability and price drift out of step with the site. Both are checked against the landing page, and a mismatch removes the product from the auction entirely.
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