The Uncomfortable Truth
Most feed optimisation advice treats all attributes equally. Fix your GTINs. Add product types. Optimise descriptions. Fill in every optional field.
Attributes are not equally consequential. A small number of them shape what a listing can match and what a shopper sees, while others mostly help you organise and report. That is a reason to sequence work, not a measured share of performance.
Start with eligibility: disapprovals, and required attributes that are missing for your category, country or variant structure. Once products can serve, title, price and image are the sensible next focus, because they influence query matching, what shoppers compare and the largest visual element of the listing.
This guide is a prioritisation view, not a ranking of measured effects. It follows Google's product data specification on which attributes are required and how they are used. Any effect in your account depends on product eligibility, data accuracy, how Google matches your products, and testing.
High-Impact Attributes
Product Title
Impact: Critical - Title determines which queries match your products. A poorly structured title means you miss searches you should be winning.
Best practice:
Brand + Product Type + Key Attribute + Variant (colour/size). Front-load important keywords. Keep under 150 characters for display truncation.
Price (and Sale Price)
Impact: Critical - Price competitiveness directly affects auction position and CTR. You're not bidding in isolation; you're bidding against competitors at different price points.
Best practice:
The feed price must match the price on the landing page. Use sale_price for genuine promotions alongside the regular price; a sale annotation may then be shown, but it is conditional on Google's own eligibility criteria and is never guaranteed. Uncompetitive prices are a bidding decision, not a feed fix.
Image Link (Primary Image)
Impact: High - The image is the largest element in the listing. Google's image requirements rule out promotional overlays, watermarks and placeholder images. Whether a plain background or a lifestyle shot performs better is a test question, not a universal rule.
Follow the requirements first:
Meet Google's minimum image sizes for your category, show the product clearly and accurately, and avoid watermarks, text or promotional badges. Test background style rather than assuming one wins.
Availability
Impact: Critical - Out-of-stock products disappear from Shopping. Preorder and backorder have different display behaviours. Inaccurate availability triggers policy violations.
Best practice:
Refresh based on how often your stock and prices actually change, not on a fixed schedule: fast-moving lines need updating far more often than a stable catalogue. Mark items out_of_stock promptly, and use preorder or backorder where they genuinely apply.
Medium-Impact Attributes
GTIN/MPN/Brand
Conditional requirement - the GTIN is required when the manufacturer has assigned one to the product, and Google treats identifiers as how it recognises which product you are selling. If no identifier exists, for example genuinely custom or handmade items, supply brand and MPN as the specification directs instead. Never invent, guess or reuse a GTIN: an incorrect identifier is a data accuracy problem that can lead to disapproval. See Google's GTIN attribute guidance.
Google Product Category
Impact: Medium - Helps Google understand product type and apply category-specific requirements. Worth getting right, but Google's auto-categorisation is usually accurate. Fix miscategorisations; don't obsess over perfect taxonomy.
Custom Labels (0-4)
Impact: Medium - Don't affect performance directly but enable segmentation and strategic bidding. Labels like margin tier, stock level, or bestseller flag allow you to bid differently based on business value.
Additional Images
Impact: Medium - Improve product representation in Shopping carousel and surfaces. Worth including if available; don't prioritise creating them over fixing primary image issues.
Shipping (Attribute)
Impact: Medium - Affects whether shipping info shows in ads. "Free shipping" badge can improve CTR. Required in some markets. Worth setting up correctly.
Usually Later in the Queue
These are still required in some categories and countries. Check the specification for your own products before treating any of them as optional.
Description
Required, and used by Google alongside your other product data. The title is the shorter, more visible field, so it usually gets attention first, but that is a sequencing judgement rather than a measured ranking weight. Describe the product accurately and do not keyword stuff.
Product Type
Your own taxonomy, optional in the specification, and most useful for segmentation and reporting. Keep it consistent enough to bid on. It is not the same field as Google's product category.
Colour/Size/Material
Whether these are required depends on the category, the country you sell in and whether the item is part of a variant group: colour and size are commonly required for apparel and accessories in some countries, and size and material requirements vary by product. Check the specification for your own categories. Where they are required, missing values are an eligibility problem, not a refinement. Google's colour attribute guidance sets out where it applies.
Product Highlights
May appear in some placements. Worth filling if you have structured data. Low priority otherwise.
Lower-Value Feed Work
Some work is usually lower value than it feels, once eligibility and required data are already sound:
- Rebuilding product type hierarchies - product_type is your own taxonomy and is mainly useful for segmentation and reporting. Google's own category is a separate attribute, and category assignment can affect which requirements apply. Fix wrong categories rather than polishing your internal tree.
- Filling every optional field first - optional attributes can help matching and filtering in some categories, but they will not compensate for missing required data or a disapproved product. Sequence them after eligibility.
- Keyword-stuffing descriptions - Google's NLP is sophisticated. Stuffing triggers quality issues, not ranking gains.
- Multiple feed tools/platforms - The tool doesn't matter. The data quality does. A spreadsheet with good data beats an expensive platform with bad data.
Prioritisation Framework
Use this framework to allocate feed optimisation time:
Feed Optimisation Priority Matrix
Eligibility and missing required data
Disapprovals, and required attributes missing for your category, country and variant structure. A product that cannot serve cannot be optimised.
Price and availability accuracy
Feed values matching the landing page, updated when stock or price actually changes
Titles
Accurate and structured, with the attributes a shopper would search on placed early
Images
Meets Google's image requirements, product shown clearly, no overlays
Identifiers and brand
Supply the GTIN where the manufacturer has assigned one, with brand and MPN as the specification requires. Never invent an identifier.
Everything else
Segmentation labels, secondary images and optional detail, once 1-5 are sound
Eligibility comes first. Until a product is approved and has the data its category and country require, work on titles and images cannot show up anywhere. After that, accuracy is worth more attention than filling every optional field. Sequence the work, then test.
How to Test Feed Changes
1. Isolate Variables
Change one thing at a time. Title structure test, then image test, then pricing test. Overlapping changes make results uninterpretable.
2. Test Subsets First
Apply changes to a subset of products (e.g., one category or brand). Measure impact before rolling out feed-wide.
3. Allow for Processing and Lag
There is no fixed waiting period. Updated data has to be fetched and processed by Merchant Center before it can affect anything, and after that the useful test length depends on your traffic volume and the lag between click and conversion. Judge on enough data for the products involved, not on a set number of weeks, and do not treat any duration as a guarantee of significance.
4. Measure the Right Metrics
CTR for title/image changes. Impression share for query matching changes. Conversion rate for landing page consistency.
Frequently Asked Questions
Which feed attributes should I fix first?
Fix eligibility first: disapproved products, and required attributes that are missing for your category, country or variant structure. A product that cannot serve cannot be optimised. After that, accurate prices and availability, then titles and images. Which attributes are required for you depends on what you sell and where, so check Google's product data specification for your own categories.
Do I need a GTIN for every product?
No. The GTIN is required where the manufacturer has assigned one to the product. Where no identifier exists, for example genuinely custom or handmade items, the specification directs you to supply brand and MPN instead. Never invent, guess or reuse a GTIN: an incorrect identifier is an accuracy problem and can lead to disapproval.
Will a sale price show a sale badge on my listing?
Not automatically. Supplying sale_price alongside the regular price makes an item a candidate for a sale annotation, but whether one is shown depends on Google's own eligibility criteria. Treat it as conditional, not guaranteed.
How long should I wait before judging a feed change?
There is no fixed period. Updated data must first be fetched and processed by Merchant Center, and after that the useful test length depends on how much traffic the affected products get and the lag between click and conversion. Judge on sufficient data for those products rather than a set number of weeks, and treat no duration as a guarantee of statistical significance.
How much do custom labels affect Google Shopping performance?
Custom labels are not ranking factors. They exist so you can segment and bid differently, for example by margin tier, stock level or seasonal flag. Any performance effect comes from the bidding decisions they enable, not from the labels themselves.
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