What is feed rule?
A feed rule is an instruction set up inside Merchant Center that changes how incoming product data is processed, such as combining fields, replacing values or setting a default.
Worked example, not a result
Rebuilding titles for one category
Say a store sends 4,300 products and the titles come straight from the storefront, where they are short and brand led because that is what looks right on the site. Those same titles do poorly in shopping placements, because shoppers search with attributes the title never mentions.
A rule can rebuild them. For the 620 apparel items, it combines brand, product name, colour and size into one title, so a listing that read as a two word product name now carries the words people actually type. For the remaining 1,700 items in the hardware range, a second rule appends the material and the pack size instead, because those are the words that category searches with.
Nothing on the storefront changes. The site keeps its clean product names and the feed carries the descriptive ones.
The counts above are an example, and the right title pattern is different for every category.
Why it matters
Feed rules put the words shoppers search into the field that decides which searches you can appear for. Titles carry most of the matching weight in shopping placements, so this is one of the highest value pieces of work available on the visitors lever, and it does not require touching the website.
They are also how a store fixes data problems at scale. Filling a missing default, standardising inconsistent colour names, or setting a value for a whole product type turns hundreds of individual corrections into one instruction that keeps applying to new products as they arrive.
For a store owner the appeal is speed and reversibility. Rules can be previewed before they take effect and removed if they do not help, which makes feed work something you can iterate on weekly rather than a project that needs a developer and a deployment.
Common mistakes
- Stuffing every attribute into the title. Long titles get cut off in the listing, and cramming irrelevant words in makes the product appear for searches it cannot satisfy.
- Applying one rule to the whole catalogue. Categories search differently, so a title pattern that suits clothing usually damages a technical product range.
- Using rules to hide a problem instead of fixing it. Overwriting an availability or price value to clear a warning creates a mismatch with the landing page that is harder to diagnose later.
- Not checking the preview before applying. A rule that misreads a field can rewrite thousands of products at once, and the effect only becomes visible when performance drops.
Related terms and answers
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