Migrating from OpenCart to BigCommerce is a strategic move from a self-hosted open-source platform to a hosted SaaS platform. In 2025, with OpenCart's self-hosting management, and BigCommerce's hosted solution with powerful features, the case for migration has never been stronger.

This comprehensive technical blueprint is designed for store owners, developers, and decision-makers. We will bypass the marketing fluff and dissect the database structures, the exact field mappings, the cost analysis, and the step-by-step execution required to move your data to BigCommerce without losing a single byte.

1. The Strategic Pivot: Why Leave OpenCart?

OpenCart is a powerful open-source eCommerce platform, but it often becomes limiting for businesses that need hosted solution with powerful features. Moving to BigCommerce opens specific opportunities:

💰 Hosted Solution

The OpenCart Pain: OpenCart requires self-hosting, server management, and technical maintenance. You're responsible for updates, security, and performance optimization.

The BigCommerce Gain: No server management, automatic updates, and reliable hosting. BigCommerce handles infrastructure.

🚀 No Transaction Fees

The OpenCart Pain: OpenCart has a smaller extension marketplace compared to major platforms. Limited third-party integrations.

The BigCommerce Gain: No transaction fees on any plan. Keep more of your revenue.

🛠 Built-in Features

The OpenCart Pain: OpenCart requires technical knowledge for advanced customization. Limited built-in features compared to hosted solutions.

The BigCommerce Gain: Advanced features like product variants, multi-currency, and SEO tools built-in.

⚡ API & Integrations

The OpenCart Pain: OpenCart requires you to manage hosting, updates, and technical aspects yourself.

The BigCommerce Gain: Powerful API and extensive integration options. Easy to connect with third-party services.

2. The Pre-Migration Architecture Audit

Before touching any data, you must map the terrain. OpenCart and BigCommerce speak different data languages.

A. Understanding the Platform Disconnect

OpenCart uses MySQL database with REST API for export. BigCommerce uses API for data import.

OpenCart Version: Are you on OpenCart 2.x, 3.x, or 4.x? Database structure may differ. Migration tools handle all versions.
Database Access: OpenCart requires MySQL database access or bridge extension. Migration tools use bridge extension for safe data extraction.
BigCommerce Setup: Ensure BigCommerce is set up and ready. Configure API access if required.
Product Structure: OpenCart products with options map to BigCommerce products. OpenCart's unlimited options may need mapping to BigCommerce's structure.
Images: OpenCart images are in image/ directory. Need to be transferred to BigCommerce's media system.

3. Exact Data Mapping: The Blueprint

This is the most critical section for developers. This is how OpenCart entities translate to BigCommerce. We assume the use of an automated migration tool.

🛍 Product Data Mapping

OpenCart Field (Source)	BigCommerce Field (Target)	Notes & Logic
`product_id`	`Product ID`	BigCommerce generates new IDs. Use SKU for mapping.
`name` (oc_product_description)	`Product Name`	Direct string transfer.
`sku`	`SKU`	Direct mapping. OpenCart SKU at product level.
`price`	`Price`	Direct mapping with currency conversion if needed.
`description` (oc_product_description)	`Description`	HTML content. Images need re-uploading to BigCommerce's media system.
`category_id` (oc_product_to_category)	`Category`	OpenCart categories become BigCommerce categories.
`product_option` and `product_option_value`	`Attributes/Variants`	OpenCart's unlimited options map to BigCommerce attributes/variants. May need consolidation if BigCommerce has limits.

👥 Customer Data Mapping

OpenCart Field	BigCommerce Field	Critical Logic
`email`	`Email`	Unique identifier.
`password` (hashed)	`Password` (on create)	Password migration depends on BigCommerce support. OpenCart uses bcrypt. Migration tool handles conversion if supported, otherwise customers must reset passwords.
`oc_address`	`Address`	OpenCart addresses map to BigCommerce customer addresses.

📦 Order Data Mapping

OpenCart Field	BigCommerce Field	Mapping Logic
`order_id`	`Order ID`	Preserve OpenCart order number in BigCommerce order ID or custom field.
`order_status_id`	`Order Status`	Map OpenCart order statuses to BigCommerce order statuses.
`total`	`Total`	Direct mapping with currency conversion if needed.

4. The Toolkit: Selecting Your Vehicle

You have three vectors of attack for this migration. Choose based on budget and technical capability.

Option A: Automated Cloud Migration (Recommended)

Tools: Shopping Cart Mover, LitExtension, Cart2Cart

Specialized tools that connect via OpenCart bridge extension and BigCommerce API.

✅ Pros: Handles database complexity, preserves relationships, formats data for BigCommerce automatically.
❌ Cons: Cost scales with data ($200 - $400). Requires bridge extension on OpenCart.

Option B: CSV Import

Tools: OpenCart CSV Export + BigCommerce CSV Import

Export from OpenCart, format for BigCommerce, and import manually.

✅ Pros: Lower cost, direct control.
❌ Cons: Manual work required, may lose some data relationships. Limited to products and categories.

Option C: Custom Development

Tools: OpenCart REST API + BigCommerce API

Build a custom script using OpenCart REST API and BigCommerce API.

✅ Pros: Complete control, reusable.
❌ Cons: Expensive ($2,500+), time-consuming. Must handle OpenCart's MySQL structure and BigCommerce's data format.

5. Execution Protocol: Step-by-Step

We will proceed using the Automated Cloud Migration method as it is the industry standard for minimizing downtime.

Phase 1: Environment Preparation

1.1. Prepare Target (BigCommerce):
Set up your BigCommerce store. Complete BigCommerce setup wizard. Configure API access if required. Do not point your domain there yet. Use subdomain for testing.
Tip: Use password protection or maintenance mode to prevent public access during setup.

1.2. Prepare Source (OpenCart):
Install migration bridge extension on OpenCart. Ensure MySQL database access is available. Keep your OpenCart store live during migration.

Phase 2: The Connection Setup

2.1. BigCommerce Access:
Configure API access in BigCommerce. Generate API credentials or set up connection method as required.

2.2. OpenCart Access:
Bridge extension connects to OpenCart MySQL database. Migration tool authenticates via bridge extension API.

Phase 3: Migration Execution

Select what to move. Be careful with these specific settings:

Create 301 Redirects: Check this box if using custom domain. It creates redirects from OpenCart URLs to BigCommerce URLs. Without this, your SEO dies.
Migrate Product Options: OpenCart supports unlimited options. May need to consolidate if BigCommerce has variant limits.
Migrate Images: Images are downloaded from OpenCart image directory and uploaded to BigCommerce's media system automatically.
Password Migration: Depends on BigCommerce support. Customer passwords may be migrated if BigCommerce supports it, otherwise customers must reset passwords.

Phase 4: The Full Migration

Launch the process. The migration tool handles OpenCart MySQL extraction and BigCommerce API import automatically.

Time Estimation: 5,000 products + 10,000 orders usually takes 2-4 hours. Large catalogs migrate efficiently via automated tools.

Phase 5: Post-Migration Cleanup

5.1. Customer Communication:
Notify customers about the migration. They may need to reset passwords depending on BigCommerce password migration support.

5.2. Verify Products:
Check all products migrated correctly. Verify images, prices, and product options. Note any variant limitations in BigCommerce.

5.3. Design & Customization:
Choose or customize BigCommerce theme. OpenCart themes cannot be migrated, but BigCommerce offers its own theme options.

6. Financial Breakdown: Cost of Migration (2025)

What does it actually cost? Here is a realistic breakdown for a medium-sized store (2,000 Products, 10,000 Orders, 5,000 Customers).

Custom Script

$2,500+

Developer Time

Automated Cloud

$249

Average Cost

Agency Service