URL Structure Changes: Magento vs BigCommerce vs Shopify

You migrate your store, launch the new site, and three weeks later your organic traffic is down 40%. Nobody touched your content. Nobody deoptimized your product pages. What changed is your URL structure — and if you didn't plan for it, Google is now trying to figure out whether your new pages are the same pages it used to rank, or something entirely different.

This is the single most overlooked part of a Magento, BigCommerce, or Shopify migration. Everyone obsesses over product data, images, and checkout flow. Almost nobody maps out what happens to their URLs until it's too late and rankings have already dropped.

Why URL Structure Breaks During a Platform Migration

Every eCommerce platform has its own opinion about how a URL should be built. Magento lets you customize almost everything. BigCommerce enforces a semi-rigid structure. Shopify is the most rigid of the three, with folder structures you cannot fully override. When you move from one to another, your old URLs almost never match your new ones — not even close.

Google has indexed your old URLs. It has associated them with rankings, backlinks, and click-through history. If the new URLs don't exist at those old paths, or aren't properly redirected, that equity doesn't transfer. It just evaporates.

How Magento Structures URLs

Magento is famous for URL flexibility, which is exactly why migrations from it are messy. A typical Magento store might have:

• Category URLs: yourstore.com/category-name/subcategory-name.html
• Product URLs: yourstore.com/product-name.html or nested under a category path
• Custom URL keys: merchants often manually rewrite URLs per product, with no consistent pattern across the catalog

The .html suffix and the option to nest products under multiple category paths creates duplicate URL patterns that need to be resolved before migration — not after.

How BigCommerce Structures URLs

BigCommerce sits in the middle. It gives you some control, but its default structure looks like:

• Category URLs: yourstore.com/category-name/
• Product URLs: yourstore.com/product-name/ (flat, not nested under category by default)
• Brand pages: yourstore.com/brands/brand-name/

Moving from Magento to BigCommerce usually means losing the .html extension and flattening any nested category paths in product URLs. That's a structural change on every single product page.

How Shopify Structures URLs

Shopify is the strictest of the three, and it's non-negotiable. Every store follows this pattern:

• Product URLs: yourstore.com/products/product-handle
• Collection URLs: yourstore.com/collections/collection-handle
• Blog URLs: yourstore.com/blogs/blog-name/post-title
• Pages: yourstore.com/pages/page-title

You cannot remove /products/ or /collections/ from the path without a workaround using a headless setup or a paid app — and even then, it adds complexity most merchants don't need. If you're migrating from Magento or BigCommerce to Shopify, every single URL on your site is changing shape. There's no way around it. The only question is whether you handle the transition correctly or let Google figure it out on its own.

The Redirect Strategy That Actually Protects Rankings

Here's what actually works when you're moving off Magento or BigCommerce onto Shopify, based on migrations we've run for stores with catalogs from 500 to 50,000 products:

1. Export every indexed URL before you touch anything. Pull this from Google Search Console's Performance report and your XML sitemap — not just what's in your CMS. Search Console shows you what Google actually has indexed, which is what matters.
2. Build a redirect map, old URL to new URL, one row per URL. Don't redirect everything to your homepage — this is the single biggest ranking killer in migrations. A blanket homepage redirect tells Google none of your old pages have a home anymore, and rankings for those specific pages die with them.
3. Match by intent, not by convenience. A Magento category page should redirect to the equivalent Shopify collection — not the closest-sounding product.
4. Implement 301 redirects, never 302s. A 301 tells Google the move is permanent and to transfer ranking signals. A 302 tells Google it's temporary, and equity stays parked on the old URL that no longer exists.
5. Submit your new XML sitemap to Google Search Console immediately after launch. Don't wait for Google to discover it organically — that can take weeks.
6. Monitor Search Console's Coverage report daily for the first two weeks. Watch for a spike in "Page with redirect" or "Not found (404)" errors. Both are early warning signs of a broken redirect map.

What This Actually Costs You If You Get It Wrong

We've seen stores lose 6 months of organic traffic recovery time from a botched redirect map. That's not a formatting inconvenience — that's real revenue, real leads, and real customers who used to find you on Google and now land on a 404 page instead.

The stores that come through a migration without losing rankings all did the same thing: they treated the redirect map as a required deliverable, not an afterthought fixed after launch. If your migration plan doesn't include a URL audit and 301 redirect map before go-live, it's incomplete — no matter how good the new theme looks.

Get This Right the First Time

URL structure isn't a detail you patch after launch — it's a decision you make before you migrate a single product. TheDeki has handled this exact problem across Magento, BigCommerce, and WooCommerce migrations to Shopify, building full redirect maps that protect existing rankings instead of resetting them to zero.

If you're planning a platform migration and want your SEO equity to survive it, book a free migration consultation with TheDeki. We'll audit your current URL structure, flag what will break, and map out the redirect plan before you move a single page.