A product page checklist that assumes you'll manually edit each page falls apart somewhere around 50 SKUs. This one is built for catalogs where manual, one-by-one optimization was never realistic in the first place.
Title tags that don't all read the same
Templated title tags are fine as a starting point, but if every product on a site follows the identical template, you're leaving differentiating detail out that could help a specific product rank for a specific long-tail search. A template that pulls in the actual distinguishing attribute — size, material, color, use case — performs better than a generic wrapper, even at scale.
Handle variants with canonical tags, not duplicate pages
If a platform generates a separate URL for each color or size variant, decide on one canonical version per product and point the rest at it. Letting Google index ten near-identical URLs for the same shirt in ten colors splits the ranking signal across all ten instead of consolidating it on one strong page.
Product schema, with the fields that actually get used
At minimum: name, image, description, price, availability, and brand. If genuine review data exists, add the aggregate rating; star ratings in search results measurably improve click-through rate. Don't fabricate reviews to fill this field. It's a policy violation, and it's also just dishonest to customers.
Write category page copy, not just product grids
A category page that's purely a grid of products with no text gives search engines nothing to understand the page's topic from beyond the products themselves. A few paragraphs of genuinely useful copy — how to choose between options, common questions, sizing guidance — gives the page something to rank on independent of any single product.
Image file names and alt text, at catalog scale
A generic camera filename tells a search engine nothing. A descriptive one tells it what's in the photo before it even processes the pixels. At a 500-product catalog, renaming every image by hand isn't realistic, which is exactly why this is one of the easiest things to automate: a consistent naming convention applied programmatically based on product attributes already in the catalog data.
Out-of-stock pages need a real strategy
Don't let an out-of-stock product 404 silently; that wastes the page's accumulated ranking signal. Either keep the page live with a clear out-of-stock notice and related product suggestions, or redirect to the closest current equivalent if the product is permanently discontinued. Letting it 404 is the one option that throws away the SEO value already earned.
Why this is an automation problem more than a knowledge problem
Almost none of this checklist requires expertise a store owner doesn't already have. What it requires is doing the same correct thing hundreds or thousands of times without getting tired or inconsistent halfway through. That's the gap worth closing specifically on large catalogs.