Product migration is one of those tasks that looks deceptively simple. Export your products from the old system. Import them into WooCommerce. Job done.
For a hundred products, that's roughly accurate. For a thousand, you'll hit some bumps. For ten thousand or more, your entire approach needs to change.
Our web development team migrated over 22,000 products into WooCommerce in a single project, and we've learned that scale changes everything. The tools that work for small catalogues don't just slow down at volume; they break in ways that create real problems for your business.
WP All Import tends to be the go-to solution for WordPress product imports, and for good reason. It's flexible, it handles most common scenarios, and for modest product counts, it works well. We've used it ourselves on smaller projects.
But once you're dealing with larger volumes, the cracks start to appear. And so do the issues...
Timeouts and memory limits
Servers have finite resources. An import that processes thousands of products in a single operation will eventually hit PHP timeout limits or memory caps. Your import fails partway through, leaving you with partial data and no clear indication of where it stopped.
Data mapping becomes unwieldy
When you're mapping dozens of fields across multiple product types, the configuration becomes complex and error-prone. One wrong mapping can corrupt thousands of records before you notice.
Subsequent imports get messy
Products change. Prices update, stock levels shift, new items get added... Running re-imports through generic tools often creates duplicates or overwrites data you didn't intend to change, or fails to match existing products correctly. Keeping a large catalogue synchronised becomes a constant headache.
Product type complexity
Simple products import relatively cleanly. But what about variable products with dozens of attributes? Subscription products with recurring billing rules? Composite products where one product is made up of others? Bundle products with their own pricing logic? The list goes on, and each adds complexity that generic tools handle poorly or not at all.
That's why, for large-scale migrations, we build bespoke import systems tailored to our clients' specific data and requirements. But we don't reinvent the wheel for the sake of it - we want to build something that actually works. For us, for you and for your customers.
When we build custom solutions, we can ensure:
Reliability
Custom imports process data in controlled batches, handling interruptions gracefully and providing clear logging of what's been processed. If something fails, you know exactly where and why.
Speed
Because we're writing code optimised for your specific data structure, imports run faster than forcing data through generic mapping systems. A migration that might take days of babysitting with off-the-shelf tools can be completed in hours, while left unattended.
Accuracy
We build validation into the import process. Data that doesn't match expected formats gets flagged before it corrupts your catalogue. Field mappings are precise because they're written for your specific source data.
Repeatability
When you need to run updates, whether daily stock syncs or periodic full refreshes, the import runs identically every time. No manual configuration to remember, and no risk of someone choosing the wrong settings.
The 22,000-product migration we mentioned above wasn't just about volume. The complexity came from the metadata attached to each product: custom fields covering technical specifications, compatibility information, trade pricing tiers and supplier data. Each product might have dozens of additional data points beyond the standard WooCommerce fields.
On top of that, the catalogue included composite products (products assembled from other products, each with its own stock and pricing) and bundle products (grouped products sold together at modified prices). These product types have their own data structures that need populating correctly, and the relationships between products also need mapping accurately.
Getting this right with a generic import tool would have been possible in theory, but a nightmare in practice. Building a custom solution lets us handle each product type appropriately, validate relationships as they were created and complete the migration in a relatively short timeframe.
Not every migration needs bespoke tooling. If you're moving 500 simple products with basic data, WP All Import (or similar tools) will serve you fine. The investment in custom development just wouldn't make sense.
Where custom solutions do become worthwhile is when:
If one or more of these applies to your situation, the upfront investment in custom tooling pays back quickly in time saved and problems avoided.
Large-scale product migrations aren't just bigger versions of small migrations. The challenges are different in kind, not just degree. Approaching a 10,000-product migration with the same tools you'd use for a few hundred is setting yourself up for frustration, delays, and data quality issues.
We've handled enough of these migrations to know what works, and our experience and expertise in building custom solutions has seen us granted Woo Pro Partner status - an accolade only given to the top 3% of WooCommerce web development agencies in the UK.
Custom import solutions take more effort to build initially, but they deliver migrations that are faster, more reliable, and easier to maintain over time.
Whether you're moving platforms entirely or consolidating multiple catalogues into WooCommerce, we can talk through the approach that makes sense for your scale and complexity. Get in touch to discuss your requirements.
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