Google Shopping feed optimisation is one of the most critical factors determining the performance of your e-commerce campaigns. In search engine marketing, Shopping ads provide visibility at the final stage where users make their purchase decision; but the quality of that visibility depends entirely on how well your product feed is structured. In this guide we cover the whole process, starting with Google Merchant Center setup and moving on to feed attributes, title optimisation, error resolution and automation tools.
Setting Up a Google Merchant Center Account
Google Merchant Center is the central platform that delivers your product data to Google. When setting up the account, first verify ownership of your business website through Google Search Console; if this step is skipped, products cannot be approved. Select Turkey as the target country, set the currency to TRY and define your shipping and returns policies in detail. Link Merchant Center to your Google Ads account; without this connection you cannot run a Shopping campaign. Check the account health section regularly; policy violations can lead to account suspension and all products being taken offline.
- Mandatory Feed Attributes: The id, title, description, link, image_link, availability, price and condition fields are mandatory for every product. If any of these fields is missing or incorrect, the product is disapproved. The 'Diagnostics' tab in Google Merchant Center shows which products were disapproved and why.
- Recommended Attributes: The GTIN (barcode), MPN (manufacturer part number), brand, product_type, google_product_category and custom_label fields are not mandatory, but they significantly improve campaign performance and product matching quality. For branded products in particular, adding a GTIN has effectively become a requirement.
- Image Requirements: For the main image (image_link), a minimum of 100x100 pixels (250x250 for fashion products), a white or light background and a shot in which the product is clearly visible are recommended. Images containing watermarks, text overlays or borders may be rejected; high-resolution, uncluttered images produce a better click-through rate.
Product Title Optimisation: The Most Critical Feed Field
The product title is the most important feed field affecting both visibility and click-through rate in Shopping ads. Titles that match the user's search query receive a higher quality score and gain an advantage in the ad auction. The ideal title structure varies by product type.
Category-Based Title Structures
Clothing and Accessories: Brand + Gender + Product Type + Attribute (Colour, Material, Size). Example: 'Mavi Men's Slim Fit Denim Jeans Blue W32 L32'. Electronics: Brand + Product Name/Model + Key Feature + Product Type. Example: 'Samsung Galaxy S24 256GB Phantom Black Smartphone'. Home and Living: Brand + Product Type + Material/Feature + Size/Colour. Including the terms users type in their search queries in the title directly improves organic matching quality; use search term reports as an input source for title optimisation.
What to Avoid When Writing Titles
Avoid capitalisation (ALL CAPS); it is acceptable only for abbreviations. Promotional language ('On Sale!', 'Free Shipping!') is prohibited in the title; use the 'promotion_id' attribute for this kind of information. Meaningless characters, excessive punctuation and irrelevant keyword stuffing lower the feed quality score and can be penalised by Google.
Category Mapping with the Google Taxonomy
The google_product_category attribute maps your products to Google's standard product taxonomy. Correct category mapping means better matching for relevant search queries, correct filtering in the Shopping tab and compliance with mandatory product data requirements in certain sectors (electronics, software). Use Google's Turkish or English taxonomy list to assign the most specific category ID to your products; subcategories should be preferred over general categories. For example, a deep category path such as 'Apparel & Accessories > Shoes > Athletic Shoes > Running Shoes' is far more effective than a generic 'Apparel & Accessories' assignment.
Feed Automation Tools and Supplemental Feeds
Managing large product catalogues manually is both time-consuming and increases the risk of errors. Feed automation tools both speed up this process and improve quality.
- DataFeedWatch: Offers a comprehensive rules engine for feed transformation and optimisation across different platforms; it automatically applies title merging, category mapping and quality control rules.
- Channable: Takes price, stock and product information from the source system (ERP, PIM, CMS) and delivers it as an optimised feed to Google, Meta and other channels; it supports rule-based title and description optimisation.
- Using Supplemental Feeds: Lets you temporarily update the title, description, custom_label and other attributes for specific products without changing the main feed. It is ideal for adding 'End of Season Sale' to titles during promotional periods or for running campaign tests.
- Price Competitiveness Analysis: The Price Competitiveness report (Merchant Center > Analytics) shows the average market price for the same product. By understanding where your price sits relative to competitors, adjust both your feed and your pricing strategy accordingly.
Quality Audits and Error Resolution
The Merchant Center Diagnostics section is the core tool for keeping a finger on the pulse of feed health. Evaluate product statuses in three categories: Approved (actively serving), Limited (serving on some platforms but with restrictions) and Disapproved (not serving). Common errors include price mismatches (feed and website prices differ), missing GTINs, invalid availability values, images that violate policy and landing page access problems. Examine each error individually to identify the root cause and make the necessary corrections in the feed or on the website. For bulk error fixes, a supplemental feed or a direct API update is the fastest solution.
Frequently Asked Questions
How often should I update my Google Shopping feed?
Daily updates of price and stock information are critical; price inconsistencies lead to product approval being removed. By activating automatic item updates in Merchant Center you can have price and stock data pulled automatically from the schema markup on your website. For the feed as a whole, a weekly update is the minimum standard.
What should be done for products without a GTIN?
For handmade products, custom-made products or products that have no GTIN, set the 'identifier_exists' attribute to 'false'. For branded products, the GS1 Turkey database or the manufacturer's official sources can be used to find the GTIN. For branded products without a GTIN, the feed quality score drops and visibility in some Shopping formats may be limited.
Why are custom labels important?
Custom label attributes let you segment your products according to your own business logic. For example, you can label high-margin products as 'high-margin', seasonal products as 'summer-2026' and new arrivals as 'new-arrival'. By using these labels in campaign and ad group configuration in Google Ads you can apply different bidding strategies to different segments.
How do feed errors affect ad performance?
Every disapproved product loses its potential ad visibility. A product disapproval rate of 20 percent or more seriously affects campaign performance; both reach and ad quality score decline. In accounts where the Merchant Center account health score remains low, Google may apply a full account suspension. For this reason, a weekly Diagnostics check should be made a routine.
Conclusion
Google Shopping feed optimisation is the cornerstone of e-commerce advertising efficiency. High-quality feed data means higher visibility, better matching and a lower cost per click. Completing the Merchant Center setup in full, continuously improving title and attribute quality and putting automation tools to work are the guarantee of long-term success. Get in touch with Toserof Tech. about your digital advertising strategy.
