Numbers in URLs Are Allowed, but They Are Not Free

Including a product number, SKU or database ID in a product URL will not get your pages penalised. Search engines crawl and rank URLs containing numeric identifiers constantly, and some of the largest ecommerce sites in the world use them. The URL is a comparatively minor ranking signal, and any reasonable structure will be indexed correctly as long as it is stable, canonicalised and internally linked.

That said, URLs are not purely technical. They appear in search results, in social shares, in messages between customers, and increasingly in AI-generated citations. A URL that reads clearly gives the user a preview of the page before they click, and that can lift click-through rate. It also gives you a small, cheap relevance signal. So the practical question is not whether numbers are permitted, but whether the tradeoff makes sense for your catalogue.

How AAMAX.CO Builds Ecommerce Sites That Rank and Convert

At AAMAX.CO, we are a full service digital marketing company delivering web development, digital marketing and SEO services worldwide, and URL architecture is one of the decisions we insist on getting right before an ecommerce build goes live. Retrofitting a URL structure across ten thousand products is expensive and risky; designing it correctly at the start costs nothing extra. Through our search engine optimization work we map category hierarchies, decide how variants should be handled, set canonical rules for filtered and sorted views, plan pagination, and build redirect strategies for discontinued products, so your catalogue accumulates authority instead of leaking it. If you are planning a new store or cleaning up an existing one, we can make sure the structure supports growth rather than limiting it.

Why Product Numbers Appear in URLs in the First Place

Numeric identifiers usually exist for good engineering reasons. They guarantee uniqueness, which matters when you sell many similar products or when two suppliers use the same product name. They stay stable when marketing renames a product, so links do not break. They make integrations with inventory, warehouse and ERP systems straightforward. And they eliminate slug collision problems entirely, which on a very large catalogue is a real operational benefit.

Platforms often default to them for exactly these reasons. If your store carries hundreds of thousands of SKUs with frequent naming changes, an ID-based scheme can be the pragmatic choice. The mistake is keeping platform defaults on a small catalogue where descriptive slugs would be easy and clearly better.

The Case for Descriptive Slugs

A URL like a category path followed by a readable product name communicates the page's subject instantly. In search results, breadcrumb-style URL display means users see that hierarchy before clicking. When someone pastes the link into a chat or a forum, the text itself sells the click. When another site links to you, an anchor derived from the URL still carries meaning.

Descriptive slugs also help internal comprehension. Analytics reports, log file analysis, crawl exports and redirect maps all become far easier to work with when URLs are human readable. Anyone who has tried to audit a site of pure numeric paths knows how much time that costs. Over a multi-year period, that operational clarity is worth more than the small direct SEO benefit.

The Hybrid Approach That Usually Wins

For most stores the best answer is both: a readable product name plus a stable identifier appended to it. This gives you uniqueness and system stability while keeping the URL legible and keyword-relevant. If a product is renamed, you regenerate the slug and redirect the old one, and the identifier ensures nothing collides in the meantime. Many mature ecommerce platforms support this pattern natively.

Keep the structure shallow and predictable. One category level before the product is usually enough; deep nesting creates long URLs and makes recategorisation painful. Use lowercase letters, hyphens between words, and no unnecessary parameters. Avoid stuffing keywords, because a bloated slug looks spammy and gets truncated in results anyway.

The Issues That Actually Hurt Ecommerce SEO

In practice, product numbers are rarely the real problem. The genuine damage comes from duplication and crawl waste. Filtered and sorted views that generate endless parameter combinations, each indexable, will consume your crawl budget and split your relevance signals. Variant pages for every colour and size, each with near-identical content, do the same. Session identifiers or tracking parameters in indexable URLs multiply the problem.

The fixes are well established. Set self-referencing canonical tags on primary product pages and point filtered variations back to the canonical view. Decide deliberately whether variants get their own indexable pages, and only do so when each variant has genuine independent search demand and differentiated content. Block or noindex low-value parameter combinations, keep your sitemap limited to canonical indexable URLs, and ensure internal links point at canonical versions rather than parameterised ones.

Discontinued products need a policy too. Leaving hundreds of dead pages returning errors wastes accumulated authority. Redirect them to the closest relevant product or the parent category, and only remove them entirely when there is no sensible destination.

Changing URLs Safely

If you decide to move from numeric to descriptive URLs, treat it as a migration rather than a settings change. Export every existing URL, map each one to its new destination, implement permanent redirects with no chains, update all internal links and navigation to the new paths, regenerate and resubmit your sitemap, then monitor indexing, crawl errors and rankings closely for several weeks. Expect a short period of fluctuation. Done properly, rankings recover and usually improve; done carelessly, you can lose a significant share of organic revenue.

Do not change URLs during peak trading periods, and do not do it piecemeal without a complete map. And be honest about the expected upside: if your catalogue is small and your traffic is modest, the effort may be better spent on product content, category page depth and a stronger digital marketing programme that drives demand in the first place.

Practical Recommendations

For small to mid-sized catalogues, use descriptive slugs under a single category level and skip the numeric identifier. For large or complex catalogues with frequent renaming, use a readable slug plus a stable identifier. In all cases, prioritise canonical hygiene, variant strategy, parameter handling and rich product content over the cosmetics of the URL. Add product structured data so pricing, availability and review information can appear in results, because that affects click-through far more than the URL format ever will.

Final Thoughts

You can absolutely have a product number in your URL for SEO purposes, and for large catalogues it may be the right engineering decision. Just make it part of a considered structure rather than an accident of platform defaults, and spend most of your energy on the duplication and content issues that genuinely limit ecommerce visibility. If you want your store's architecture reviewed properly, our team can help.