Ecommerce SEO: a plan for categories, products, and filters

What data do you need before changing the catalog?

Export your categories, products, and variants from the CMS, including URLs, stock keeping units (SKUs), availability, and prices. Add the pages generated by filters, sorting, and pagination. These often won't appear in a product export, but you can find them by browsing the store or running a crawler. Save a dated copy of the inventory before making changes.

Choose a product family that matters to the store and includes different situations. Our fictional store carries eight lamp models: four desk lamps, two bedside lamps, and two floor lamps. One is temporarily out of stock, and some come in several colors. The store also keeps a page for a ninth, discontinued model. All URLs, product details, and financial figures in this example are illustrative; they do not describe a client.

For the first review, include every page in this family, along with its URL variations. For a larger catalog, sample each page template and stock status that actually exists. If you find a template error, check how many other pages use that template. Fixing only the sampled product could leave the same problem elsewhere.

Combine the inventory with Search Console data by page and query, organic landing sessions from Analytics, and orders from your order management system. The last three complete months are a reasonable starting point. If the assortment is seasonal, compare that period with the same months a year earlier. Without access to private data, you can review structure and content, but mark indexing, observed demand, and sales as "needs verification." Missing data doesn't mean a page has no value.

Which page should answer each search?

Search for the terms your customers use in the market you sell to. Notice whether the results show product lists, a specific model, or explanations. In Search Console, select a query and open the Pages tab to see which URLs receive impressions. If two URLs appear for the same query, compare their content. Their presence alone doesn't prove that one hurts the other.

The three dimmable models are a feature of this example, not a universal minimum for a category. If a new selection always shows the same products as its parent category and answers the same need, improve one destination. If it serves a distinct need, prepare a specific title, product selection, and buying advice before publishing it.

Decide how to handle variants, too. Our example keeps all colors on one product page. A store with separate variant pages needs each URL to show the selected variant's images, price, and availability. Google's documentation on product variant structured data covers both single-page and multi-page setups. Choose the approach that fits how your catalog works.

How do you turn filter decisions into technical rules?

Ask your developer to test a real URL for each intended behavior. "Exclude filters" doesn't say whether you want to remove indexed pages, reduce crawling, or consolidate duplicates.

For nonexistent filter combinations or combinations with no results, Google recommends returning HTTP 404 at the requested URL. Assess an established category that's temporarily empty separately: consider whether products will return and whether the information on the page is still useful. A rule for an impossible filter combination shouldn't determine what happens to every empty category.

These decisions apply across platforms, but implementation depends on your CMS, theme, and installed modules. Ask for staging tests of HTTP status codes, canonicals, robots rules, and generated links. If the CMS can't support a proposed rule, document that limitation and a testable alternative. Use the technical SEO audit guide to work through the checks.

What belongs on category and product pages?

Help shoppers narrow their choices on a category page. For desk lamps, make it easy to compare base size, height, adjustability, and dimming options. Show relevant products, prices, and availability. Filters should use consistently populated product attributes. A long introduction above the product grid can delay the comparison a visitor came to make.

On Arco 40's product page, give shoppers what they need to assess that model: dimensions with units, materials, bulb socket or integrated LED, compatibility, box contents, detail photos, and shipping and return terms. If the bulb isn't included, say so near the purchase information. Link to a compatible bulb only after verifying compatibility. Selecting the black variant must show its photo and stock status, even when a shopper arrives through a direct link.

The page title and H1 should make the page easy to identify. In our example, use "Dimmable desk lamps" for the category and "Arco 40 adjustable desk lamp" for the product. Add the brand and features when they help identify it. Avoid repeating generic "quality and design" copy across every product page or setting the same word count for every description.

Check your Product and Offer structured data as well. Price, currency, and availability must match the visible offer. If you use Merchant Center, compare those values with the feed. Run an available product, a variant, and an out-of-stock product through the Rich Results Test. The test checks markup. Eligibility doesn't guarantee a rich result or better rankings.

What should happen to out-of-stock or discontinued products?

Ask the purchasing manager whether the product will return, whether a replacement exists, and whether customers still need the old page. "Unavailable" isn't enough information to choose between keeping, redirecting, and removing it.

Merchant Center distinguishes out_of_stock from backorder. The latter means you accept orders for a product that will ship when it's available again. Match the attribute to whether customers can actually buy the item, following the availability requirements. For the other decisions, your developer can check Google's guidance on permanent redirects and HTTP status codes.

How do shoppers and crawlers reach every useful page?

Shoppers should be able to open all four desk lamp product pages through standard links from the category. If published, the dimmable selection needs a link from the category and links to its relevant products. Google recommends navigation built with HTML links. A product page found only by typing its name into the store's search box may not be discovered through site links.

If a product list spans several pages, each next page needs its own URL and crawlable links. ?page=2 contains different products, so don't automatically give it a canonical pointing to page one. A "Load more" button needs an alternative path crawlers can follow, as explained in Google's pagination guidance.

A guide to choosing a lamp for a small desk could explain how to measure the space and link to suitable models. Write it when shoppers have questions that need more explanation. Keep each model's dimensions on its product page instead of repeating them across nearly identical articles. The Revée case study illustrates this division between informational articles, categories, and product pages, with links connecting different customer needs.

If you sell internationally, check search terms, product availability, and delivery terms for each market. The international SEO checklist covers these checks and language-specific URLs. If you're changing CMS platforms or URL structure, prepare your SEO migration map before changing catalog URLs.

How can sales data help you prioritize SEO work?

Address confirmed blockers first. A category with available products that's mistakenly excluded from the index takes priority over polishing an already useful description. Among accessible pages, compare observed demand, stock availability, margin, and the work required. A category with few orders may need attention if missing purchase information is losing shoppers. A popular discontinued product may primarily need a sensible plan for its removal or replacement.

Use Search Console for queries, clicks, and pages; Analytics for landing sessions and recorded actions; and your order management system for orders, returns, and margins. GA4 doesn't collect ecommerce events automatically. Have someone test the path from product page to purchase and refund. Product IDs, the transaction_id, value, and currency must arrive correctly, following the ecommerce measurement specifications.

This comparison counts orders placed during those sessions, with transaction IDs reconciled against the order management system. An order may contain products from other categories: the landing page and the items sold are separate dimensions. These figures don't establish how much revenue SEO caused, and they aren't a growth forecast. For the broader report, see how to measure SEO results.

How do you turn the review into an actionable plan?

Create a spreadsheet with one row per change. Copy these fields and assign each task to someone who can implement it. "Optimize categories" is too broad to tell whether the work is done.

URL or URL group
Observed problem and evidence
Decision and requested change
Owner and dependencies
Priority and reason
Target date / release date
Acceptance check
Outcome and next review

1. Fix a confirmed blocker

   In our example, /desk-lamps/ has an accidental noindex rule. The developer removes it after confirming that the category is ready to be indexed. At handoff, check for a 200 response, the absence of that rule, and accessibility through URL Inspection. Return to the indexing report later: passing the live test doesn't prove Google has already updated its index.

2. Assign content and data checks to the right people

   The catalog manager confirms dimensions and availability for the four models. The writer updates the category and Arco 40 page. Set specific acceptance criteria: each agreed measurement appears on the product page, the selected color shows the correct photo and price, and the category supports comparison. Keep existing URLs unless there's a reason to change them.

3. Test the filter rule before releasing it

   The developer demonstrates the result for a filter to exclude, the dimmable selection to publish, and a paginated page. The SEO lead compares those results with the original catalog map. If the rule also blocks a useful page, fix it before applying it across the catalog.

4. Separate release checks from performance review

   After release, repeat the URL checks and test purchases, variants, and tracking. Schedule an initial data review after four complete weeks as a working checkpoint, not a deadline for rankings. Record promotions, stockouts, and other changes that might explain differences. If there's still too little data, observe for longer before deciding on more changes.

When you revisit the spreadsheet, close completed tasks with evidence and assign anything still open. If a category gets impressions for unexpected searches, check whether those searches fit the products before changing the selection or copy. If visits grow but orders stay flat, review availability and the purchase path with the person running the store.