BigCommerce Migration 2026: Expert Guide to Safe Replatforming

What a BigCommerce migration actually moves

Before touching any tool, get precise about scope. A complete migration is not just products; it is every entity your store depends on. Build a checklist and confirm how each item will be handled:

• Catalog: products, variants and options, SKUs, prices, cost, weight, inventory levels, and images.
• Taxonomy: categories, product relationships, and any custom fields or metafields.
• Customers: accounts, addresses, and groups. Note upfront that passwords almost never migrate, because platforms hash them differently, so customers will need a password reset on launch.
• Orders: historical order and transaction records, which customers expect to see in their account.
• Content and SEO: CMS pages, blog posts, product reviews, meta titles and descriptions, and, critically, your full list of live URLs for redirect mapping.
• Configuration: tax rules, shipping zones, payment gateways, and discount or coupon codes, which are re-created rather than imported.

Anything not on this list at the start tends to be the thing discovered missing after go-live.

Step 1: Audit, back up, and set a baseline

Take a full backup and export of your current store so you always have a rollback. Then do two things most migrations skip. First, build a data inventory: a spreadsheet listing product counts, variant counts, customer counts, and order counts, so after migration you can confirm the numbers match instead of assuming they do. Second, capture an SEO baseline from Google Search Console and analytics: your top landing pages, top queries, current rankings, organic traffic, and conversion rate. Without this baseline you cannot tell whether the migration hurt your SEO or not. Finally, clean the catalog now, remove dead SKUs, fix broken images, and de-duplicate, so you migrate a lighter, correct dataset, and freeze major catalog changes during the migration window.

Step 2: Map your data to BigCommerce's structure

This is where migrations succeed or fail, because every platform models products differently and BigCommerce will not accept a one-to-one dump. Map the source structure to BigCommerce deliberately:

• From Shopify: Shopify collections become BigCommerce categories, product handles become URL paths, and metafields become custom fields. The biggest gotcha is the variant model: Shopify's options-and-variants structure has to be mapped onto BigCommerce's options, variants, and modifiers, where modifiers are choices that do not generate a separate SKU. Get this mapping wrong and you lose SKUs or inventory tracking.
• From WooCommerce: WooCommerce lives in WordPress, so you are exporting from MySQL and WordPress taxonomies. Map product types (simple, variable, grouped) and attribute taxonomies to BigCommerce categories and options, and plan to move blog content separately since it sits in WordPress, not the store.
• From Adobe Commerce (Magento): this is the hardest source because of its EAV model, attribute sets, and configurable, bundle, and grouped product types, often across multiple store views. Reconcile attribute sets to BigCommerce custom fields and options, and expect custom extensions to be rebuilt rather than carried over.

Document the mapping in writing before you migrate anything. It becomes your validation checklist in Step 4.

Step 3: Choose your migration method

There are three realistic routes, and the right one depends on catalog size, data complexity, and how much order history you must preserve:

• Automated migration apps such as Cart2Cart or LitExtension connect to your source platform's API and move products, customers, and orders into BigCommerce with far less manual work. This is the default for most mid-market stores.
• CSV import and export is workable for small, simple catalogs, but it demands exact column mapping to BigCommerce's import template and struggles with complex variants and order history.
• API-driven or professional migration is the route for large catalogs, heavy customization, or an Adobe Commerce source, where you script the transfer against BigCommerce's API or bring in a migration expert to handle mapping, order history, and edge cases.

Whichever you pick, confirm in advance how it handles the two things automated tools most often drop: full order history and customer passwords.

Step 4: Migrate into staging and validate

Never migrate straight to a live domain. Set up your BigCommerce store and run a small sample migration first, a few dozen products spanning your most complex variant and category cases, then inspect the results against your source data. Check that prices, SKUs, inventory, variant combinations, images, and custom fields all landed correctly, and that categories and customer records map as planned. Only once the sample is clean do you run the full migration. Afterward, reconcile against the data inventory from Step 1: the product, customer, and order counts should match. Discrepancies here are far cheaper to fix in staging than after launch.

Step 5: Preserve SEO with 301 redirects and metadata

This step decides whether your rankings survive, and it is the one thin guides gloss over. URL structures change on BigCommerce, so every old URL needs a 301 redirect to its new equivalent. Do it methodically:

• Extract every live URL from your XML sitemap, Google Search Console, and a full crawl of the old site, so nothing is missed.
• Map old to new in a spreadsheet, one row per URL, prioritizing your highest-traffic pages from the Step 1 baseline.
• Bulk-import the redirects into BigCommerce's Redirect Manager via CSV before you switch DNS, so they are live the moment the store goes public.
• Carry over on-page SEO: title tags, meta descriptions, H1s, and image alt text, and re-implement product and review structured data so search engines see continuity.

Missing redirects turn old ranking pages into 404s, which causes an immediate drop in organic traffic, exactly the outcome replatforming is supposed to avoid.

Step 6: Launch, DNS cutover, and go-live testing

Run a full pre-launch pass before pointing your domain at BigCommerce. Place end-to-end test orders with your payment gateway in test mode, verify tax rules and shipping zones for your real regions, and spot-check that redirects resolve instead of 404ing. Confirm analytics, Search Console, and any ad pixels are installed and firing, and test the storefront on mobile and for performance. When everything passes, update your DNS to point to BigCommerce, then immediately re-test checkout and redirects on the live domain, since DNS is the point where small misconfigurations surface.

Step 7: Monitor after go-live

The migration is not done at launch; the first few weeks are where you catch what slipped through. Submit your new sitemap to Google Search Console and watch the Coverage and Pages reports for crawl errors and spikes in 404s, then patch any missing redirects fast. Track rankings, organic traffic, and conversion against your Step 1 baseline for at least a few weeks so you can distinguish normal re-crawl fluctuation from a real problem. Keep an eye on order flow and payment success to confirm the commercial side is healthy, not just the pages.

DIY vs. hiring a BigCommerce migration expert

A small store with a clean catalog and no complex order-history requirement can realistically complete this guide in-house with a migration app. The calculus changes once you have thousands of SKUs, intricate variants, heavy customization, an Adobe Commerce source, or high organic traffic you cannot afford to risk, which is why so many merchants search for a BigCommerce migration service, expert, or support rather than doing it alone. In those cases the cost of downtime, lost order history, or an SEO drop dwarfs the cost of doing it right the first time.

If you want this handled end to end, Netalith provides eCommerce migration and store support, from data mapping and staging validation to redirect setup and a tested launch. For large or heavily customized replatforming with bespoke data mapping and integrations, we also build custom migration and commerce integrations so complex catalogs move without losing what matters.