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The Best SEO Agencies for Shopify Plus Migrations
20 Aug 2026
A merchant moved two stores off Magento, added 301 redirects, kept the product IDs and checked the new analytics against the old backend. Traffic and revenue fell across every channel anyway. Site migrations are the most common cause of a sudden ranking loss, and the reason is rarely the platform itself. Rankings survive a replatform when the pre-launch URL work and the post-launch monitoring are done in full, and they fall when either half is skipped. Order below reflects how completely each firm owns that span.
| Migration Step | How to Protect Rankings |
| Crawl the old site | Inventory every live URL before launch, including orphan pages |
| Build the redirect map | One-hop 301 from each old URL to its true equivalent |
| Cover every page type | Redirect blog posts, collections and legacy filter URLs, not only products |
| Preserve on-page signals | Carry titles, H1s, internal links and schema into the new theme |
| Manage the recovery window | Keep redirects live at least a year and monitor indexation before acting |
Why a Replatform Puts Rankings at Risk
Launch day is the part everyone prepares for, and it poses the least risk. The risk sits in the inventory done before the move and the monitoring done after it. A replatform changes URLs, and every changed URL forces Google to recrawl the page, find the redirect, and reassign the ranking power the old address held. When that path is complete and direct, most of the equity transfers. When it has gaps, the equity leaks and the store loses positions it spent years earning.
The community record on Magento-to-Shopify moves shows the same pattern across dozens of threads. Owners report large drops at cutover, sometimes on the same day, even after following published checklists. The consensus among practitioners is that a same-day cliff points to a redirect map that was incomplete before launch rather than a fault in Shopify. Shopify’s own migration guidance concedes the point indirectly by telling merchants to expect a temporary dip and to keep redirects live indefinitely, which is an unusual admission from a platform vendor and a fair reading of the actual risk.
Migrating Without a Full URL Inventory
The first failure happens before a single redirect is written. Teams build their redirect list from the new site’s sitemap, which only contains the pages that already exist on Shopify. Any old page missing from that list has no redirect and becomes an orphan. The pages that hurt most are the ones nobody remembers, an old blog post still pulling backlinks, a legacy filtered URL that ranked for a long-tail term, a discontinued product with external links pointing at it.
The correct order reverses this. A specialist crawls the old site first and records every live URL in a mapping spreadsheet, then decides where each one will live on Shopify. A store of any size can hold thousands of these, and the ones that earn traffic are not always the ones the merchant would guess. Building the inventory from the old crawl rather than the new sitemap is the single step that separates a migration that holds from one that posts a panicked thread three weeks later.
Partial, Chained, and Homepage Redirects
Even teams that build a map often build an incomplete one. A common version covers products and forgets the blog, the collection pages and the old filtered URLs, which leaves dozens of ranked pages with nowhere to go. The fix is coverage across every page type the old site exposed, not only the catalog.
The second version of this failure is structural. Chained redirects route an old URL through two or three hops before it reaches its destination, and each hop leaks a little equity and slows the crawler. The target is one hop from every old URL straight to its final Shopify address. The third version is the blanket homepage redirect, where every retired URL points at the home page. That preserves the response code and destroys the relevance, because a product page redirected to the homepage tells Google nothing about what the old page ranked for. Each old URL needs a 301 to its closest true equivalent, and a 301 rather than a 302, since a temporary redirect does not pass ranking power.
Losing On-Page and Schema Signals in the Rebuild
A migration can move every product and every customer record correctly and still drop, because the theme rebuild changed the signals that earned the rankings. New themes frequently rewrite title tags, alter H1s, restructure internal linking and omit the structured data the old site carried. The catalog arrives intact and the on-page layer does not come with it.
Schema is the most overlooked piece. Product, breadcrumb and organization markup feed the entity signals Google uses to understand a page, and a rebuild that ships without schema parity hands the new site a weaker profile than the old one had. Internal linking matters for the same reason, since the way collection and product pages point at each other concentrates authority on the pages meant to rank. A specialist checks title, heading, link and schema parity against the old site before launch and treats any silent change as a defect to correct, not a cosmetic difference.
SEO Agencies That Specialize in Shopify Plus Migrations
The firms below all handle replatforming, and they differ in which part of the migration they own most completely. Growing Search is placed first because it owns the full span, from the pre-launch audit through the months of monitoring that decide how much ranking comes back.
Growing Search
Growing Search keeps a migration under one team from the pre-launch URL map through the months after cutover, so whoever charts the old URLs is also accountable for the equity that either comes back or does not. Its BrandLens tool shows if an assistant points a shopper to the store or to a competitor when asked for a recommendation, which after a migration reveals if the brand held its place in AI answers or handed it away while the URLs were in flux. The same cross-market link work fits an international replatform consolidating storefronts across regions. A brand planning a move can start with a Shopify Plus SEO agency that stays engaged long after cutover.
1Digital Agency
1Digital Agency has built its migration practice around a codified method, publishing a seven-stage canonical-preservation process that covers the pre-migration audit, URL mapping, one-hop 301 architecture, canonical and schema parity, sitemap orchestration and post-launch indexation monitoring with a rollback plan. Its depth is strongest on Magento-to-Shopify-Plus replatforms, which is the exact move most merchants make when they leave Adobe Commerce. The agency self-reports 15 years in ecommerce, more than 400 brands migrated, a 4.9 out of 5 across 900-plus reviews, and zero failed cutovers, figures that come from its own reporting and are worth reading as such. For a team that wants a documented, repeatable process rather than an ad hoc plan, the methodology itself is the draw.
OuterBox
OuterBox brings more than 20 years of ecommerce SEO and development under one roof, which lets it own both the technical rebuild and the search work of a migration rather than coordinating two suppliers. That combination is useful when the replatform is also a redesign, since the people changing the theme are the same people responsible for preserving the on-page signals. Its aggregate client results are self-reported and should be read that way, but the long tenure and the paired build-and-SEO capability are the practical reasons to consider it for a move that involves a full site rebuild.
Charle Agency
Charle Agency is a UK Shopify Plus partner that treats SEO continuity as part of the build rather than a task bolted on afterward. It publishes a detailed migration guide covering URL mapping, redirects and rank preservation, and it approaches a replatform as a design-and-build engagement where the redirect map and metadata carry over as a matter of course. Its fit is strongest for merchants who want the store rebuilt and the search continuity handled by the same partner, particularly in the UK and European markets it works in.
Blubolt
Blubolt is a UK Shopify Plus agency focused on the platform’s structural traps, and it publishes practitioner guidance on the core technical SEO challenges that recur across Shopify builds. Its emphasis at cutover is the platform-specific behavior that catches generalists, from canonical handling to duplicate metadata, which makes it a technical-first choice for a migration where the concern is Shopify’s own defaults rather than a full redesign. A merchant who already has the content and links in hand and needs the structural side handled correctly will find that focus a match.
The Migration Is Not Finished at Launch
The instinct after a cutover is to treat the launch as the finish line and move on. The evidence points the other way. A large catalog needs weeks to a couple of months for Google to recrawl and reassign equity, and a spike in “crawled, currently not indexed” during that window is usually the normal recrawl rather than a failure to fix. Owners who intervene too early, or who delete “old” redirects after a few months, sever backlinks that were still passing equity and turn a temporary dip into a permanent loss. The redirects should stay live for at least a year and preferably longer, and the indexation should be watched rather than forced. A merchant judging a migration should look past how cleanly the store launched on day one. The test that matters is a team still measuring recovery in month three, since that is the stretch where rankings come back or slip away for good.
