The definitive 47-point Joomla to WordPress migration checklist for large sites. Built from a real 30+ year media brand migration (SAMinfo.com). Covers content audit, URL mapping, redirects, SEO preservation and post-launch QA.

Joomla to WordPress Migration Checklist: 47-Point Guide for Large Sites

Migrating a large site from Joomla to WordPress is one of the most technically demanding CMS projects you can undertake. Do it right and you preserve 15 years of SEO equity, a loyal audience, and a functioning business. Do it wrong and you can erase rankings overnight, break thousands of URLs, and spend months in recovery mode.

We built this checklist from the inside out—specifically from our work migrating SAMinfo.com, the digital home of SAM Magazine, a media brand with over 30 years of publishing history. That migration involved tens of thousands of articles, complex URL structures, and a readership that couldn’t afford downtime. The 47 points below are what we actually checked off.

Whether you’re managing the migration yourself or hiring an agency, use this as your master Joomla to WordPress migration checklist. Miss any of these steps and you’ll likely find out the hard way.

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Why Large-Site Migrations Are Different

Small Joomla sites (under 500 pages) can often be migrated with a plugin and a weekend. Large sites—media brands, membership organizations, e-commerce stores with thousands of SKUs—are a different animal entirely. The risks compound with scale:

• SEO exposure is massive. A 30,000-page site with 15 years of backlinks has enormous ranking value that can vanish if URL mapping fails.
• Content complexity is higher. Custom Joomla components, article categories, K2, VirtueMart, and community builder integrations all need WordPress equivalents.
• Downtime costs are real. Media brands, SaaS tools, and e-commerce sites can’t go dark for 48 hours while you sort out migration issues.
• Redirect volume is unmanageable without a system. Thousands of URL pattern changes require a structured approach, not a plugin and a prayer.

The SAMinfo.com migration succeeded because we treated it as an infrastructure project, not a content project. That means planning first, migrating second, and validating thoroughly before flipping the DNS.

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The Complete 47-Point Joomla to WordPress Migration Checklist

Phase 1: Pre-Migration Audit & Planning (8 Points)

Before touching a single file, you need a complete picture of what you’re migrating. This phase is where most teams underinvest—and where most migrations go sideways later.

1. Audit total content volume. Count every post, page, article, category, tag, and custom content type in Joomla. Know the number before you start—it determines your tooling, timeline, and risk profile.
2. Document all active Joomla extensions. Every extension you’re running needs either a WordPress equivalent, a custom solution, or a deliberate decision to deprecate it. List them all now.
3. Identify custom Joomla components. Custom-built Joomla components (not off-the-shelf extensions) require developer analysis. Flag these immediately—they’re your highest-risk migration items.
4. Export a complete list of all public-facing URLs. Crawl the live Joomla site with Screaming Frog or Sitebulb and export every indexable URL. This becomes your redirect mapping source of truth.
5. Run a Google Search Console crawl and coverage report. Identify every URL Google has indexed. Cross-reference with your crawl to catch any URLs that are indexed but not in your sitemap.
6. Benchmark current performance metrics. Document Core Web Vitals scores, page load times, and server response times before migration. You’ll need these to verify you haven’t regressed post-launch.
7. Define measurable migration success criteria. What does “success” mean? Define it: organic traffic within 5% of baseline at 30 days, zero 404s on top-100 pages, all 301 redirects active within 24 hours of launch.
8. Set up a staging WordPress environment. Never develop on production. Your staging environment should mirror production infrastructure—same PHP version, same server configuration, same CDN if possible.

Phase 2: WordPress Environment Setup (5 Points)

9. Install WordPress with the correct PHP version. Match your PHP version to your production environment. For large sites, PHP 8.1+ with OPcache configured is a baseline performance requirement.
10. Configure WordPress permalink structure before importing content. Set your permalink structure first—changing it after import requires regenerating thousands of permalinks and updating all internal links. Decide whether you’re matching Joomla’s URL structure or improving it.
11. Install and configure WP All Import. WP All Import (with the Pro license for custom post types) is the industry standard for large Joomla-to-WordPress content migrations. Configure it before you start importing.
12. Install Yoast SEO or Rank Math for metadata handling. These plugins manage meta titles, meta descriptions, canonical URLs, and sitemaps. They also make it easy to import Joomla metadata fields if you’ve exported them correctly.
13. Install and configure the Redirection plugin. The Redirection plugin by John Godley handles 301 redirect management at scale. Set it up early—you’ll be adding hundreds or thousands of redirect rules during migration.

Phase 3: Content Audit & Export (6 Points)

14. Export Joomla content in a structured format. Use Joomla’s built-in export tools, J2XML, or a direct database export to get your content into a format WP All Import can process. CSV or XML are both valid; XML preserves more metadata.
15. Audit for duplicate and thin content before migrating. A large-site migration is your best opportunity to fix content debt. Identify duplicate articles, stub pages, and thin content (under 300 words on non-utility pages) and decide upfront: migrate, consolidate, or delete.
16. Document all image directories and media paths. Joomla stores images differently than WordPress. Map your Joomla media directories to WordPress /wp-content/uploads/ structure before migration, or plan a bulk media transfer and path update.
17. Identify and preserve user-generated content. Comments, forum posts, reviews, and ratings stored in Joomla databases need separate export and import workflows. Don’t let them fall through the cracks.
18. Export user accounts and membership data. If your Joomla site has registered users, subscriptions, or membership levels (JomSocial, Community Builder, etc.), export this data separately and map it to WordPress user roles and membership plugins.
19. Catalog all custom fields and article metadata. Joomla articles can have extensive custom field data. Map every custom field to its WordPress equivalent (native custom fields, ACF, or Pods) before import.

Phase 4: URL Mapping & Redirect Management (6 Points)

This phase is where large-site migrations most commonly fail. URL changes break inbound links, destroy PageRank, and devastate search rankings. On the SAMinfo.com migration, we mapped thousands of URL patterns before writing a single redirect rule.

20. Create a master URL mapping spreadsheet. Every Joomla URL maps to a WordPress URL. Build this spreadsheet before migration. Columns: Old URL, New URL, Status Code, Redirect Type, Priority (high/medium/low based on traffic).
21. Identify and document all URL pattern changes. Joomla URLs often follow patterns like /component/content/article/123-title or /index.php?option=com_content&view=article&id=123. Identify every pattern—then write regex redirect rules, not individual redirects, for each pattern.
22. Prioritize high-traffic and high-authority URLs. Use Google Search Console (clicks/impressions) and Ahrefs/Semrush (referring domains) to identify your highest-value URLs. These get individual redirect testing; everything else gets pattern-based rules.
23. Implement 301 redirects—never 302. 301 redirects pass link equity. 302 redirects do not. Every permanent content move should be a 301. Audit your redirect rules after implementation to ensure no 302s slipped in.
24. Handle Joomla SEF URL configurations. Joomla’s Search Engine Friendly URL settings can produce multiple URL formats for the same content. Map all variants (with/without trailing slashes, with/without index.php prefix) to the canonical WordPress URL.
25. Test all redirect chains for loops and excessive hops. A redirect that goes A → B → C is a 2-hop chain that wastes crawl budget. A → A is a loop that blocks crawling entirely. Use Screaming Frog’s “Follow Redirects” mode to audit all chains after implementation.

Phase 5: Plugin Replacement Planning (6 Points)

26. Map every Joomla extension to a WordPress equivalent. Build a one-to-one replacement map. For every Joomla extension: what WordPress plugin replaces it? Is the WordPress plugin actively maintained? Does it have feature parity?
27. Replicate Joomla’s ACL (Access Control Levels) in WordPress. Joomla’s granular ACL system doesn’t have a direct WordPress equivalent. Map your Joomla access levels to WordPress user roles (Subscriber, Contributor, Author, Editor, Admin) with supplementary plugins if needed.
28. Replace Joomla contact forms. Contact Enhanced, RSForm!, and Chronoforms are common Joomla form solutions. Replace with Contact Form 7 (free, lightweight) or Gravity Forms (advanced logic, integrations). Migrate existing form submissions to the new system.
29. Replace Joomla gallery components. RokGallery, PhocaGallery, and Sigplus are common Joomla gallery extensions. Evaluate WordPress-native galleries (Gutenberg blocks) or dedicated plugins like Envira Gallery or Modula based on your feature requirements.
30. Plan VirtueMart to WooCommerce migration if applicable. VirtueMart-to-WooCommerce is a migration within a migration. Products, variations, customers, orders, and payment gateways all need separate migration workflows. Tools like Cart2Cart can automate much of this.
31. Document custom Joomla component functionality requiring development. Anything built custom in Joomla (custom modules, plugins, or components) will likely need custom WordPress development. Scope this work before migration, not after.

Phase 6: Content Import & Cleanup (6 Points)

32. Import content using WP All Import with complete field mapping. Configure WP All Import to map every source field (title, body, excerpt, author, date, categories, tags, custom fields, meta title, meta description) to its WordPress equivalent. Do a test import on 50 articles before running the full import.
33. Verify all images migrated correctly and update media paths. After import, crawl imported content for broken image URLs. Use a tool like Better Search Replace to update any hardcoded Joomla media paths to WordPress paths.
34. Test imported content for formatting issues. Joomla’s WYSIWYG editors (JCE, TinyMCE) can produce HTML that renders differently in WordPress’s Gutenberg editor. Spot-check imported articles for line-break issues, encoding problems (smart quotes, em dashes), and layout breakage.
35. Re-assign author information to correct WordPress users. If your Joomla site had multiple authors, ensure bylines map correctly to WordPress user accounts. Verify author archive pages resolve correctly post-migration.
36. Import and verify categories and tags taxonomy. Category and tag structure should match your URL mapping decisions. If you’re flattening a complex Joomla section/category hierarchy into WordPress categories, verify the taxonomy import reflects the intended structure.
37. Restore custom fields using Advanced Custom Fields if required. For content with extensive custom field data, ACF (Advanced Custom Fields) is the standard WordPress solution. Verify all custom field data imported correctly and displays on the front end.

Phase 7: SEO Preservation (6 Points)

SEO preservation is the highest-stakes phase of any large-site migration. Get this wrong and you can undo years of organic growth in a single deployment. We treat this phase as non-negotiable—every point is verified before DNS cutover.

38. Verify all meta titles and descriptions transferred correctly. Use Yoast SEO’s bulk edit interface to audit meta titles and descriptions across all imported content. Compare against your Joomla metadata export to catch any migration gaps.
39. Test canonical URLs on all key pages. Every page should have a canonical URL tag pointing to its intended URL. Check for self-referencing canonicals (good), wrong-domain canonicals (bad), and missing canonical tags (needs fixing).
40. Update and submit XML sitemap to Google Search Console. Generate a fresh XML sitemap in WordPress (Yoast or Rank Math handle this automatically). Submit it in Search Console and monitor for coverage errors in the first 7 days post-launch.
41. Audit and fix broken internal links. Internal links that pointed to Joomla URLs now need to point to WordPress URLs—or be covered by 301 redirects. Use a plugin like Broken Link Checker to crawl all imported content and identify internal link issues.
42. Preserve structured data and schema markup. If your Joomla site used structured data (JSON-LD, microdata), verify it was migrated correctly. Use Google’s Rich Results Test to check article, breadcrumb, and organization schema on key pages.
43. Verify hreflang tags for multilingual sites. If your Joomla site served multiple languages (common in media publishing), verify hreflang tags are implemented correctly in WordPress. Missing or incorrect hreflang implementation is a common cause of post-migration ranking drops in non-English markets.

Phase 8: Post-Launch QA & Monitoring (4 Points)

44. Complete a pre-launch technical audit. Before flipping DNS, run a full technical SEO audit using Screaming Frog (or Sitebulb for larger sites). Check for: 404 errors, redirect chains, missing meta tags, duplicate titles, slow page load times, and crawlability issues.
45. Monitor Google Search Console crawl errors in the first 48 hours. The first 48 hours after DNS cutover are critical. Watch Search Console’s Coverage report for spikes in 404s—these indicate missed redirects that need immediate attention.
46. Set up 404 monitoring alerts for missed redirects. Configure server-level 404 logging and set up alerts (via Search Console email alerts, Ahrefs alerts, or a monitoring service) to catch missed redirects as users and crawlers encounter them.
47. Verify Core Web Vitals match or improve pre-migration benchmarks. Compare your post-launch Core Web Vitals (LCP, CLS, FID/INP) against the benchmarks you documented in Phase 1. WordPress themes and plugins can introduce performance regressions that hurt rankings.

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Tools Used in Large-Site Joomla to WordPress Migrations

These are the tools we reach for on every large-scale Joomla migration. They’re not the only options, but they’re what we’ve found reliable at scale:

Tool	Purpose	Phase
WP All Import	Content migration from Joomla XML/CSV exports	Phase 6
Redirection plugin	301 redirect management at scale	Phase 4
Yoast SEO	Meta data, sitemaps, canonical URLs	Phases 2 & 7
Screaming Frog	Pre/post migration crawl audits	Phases 1, 4, 8
Google Search Console	Indexed URL discovery, post-launch monitoring	Phases 1, 7, 8
Better Search Replace	Bulk URL updates in WordPress database	Phase 6
Advanced Custom Fields	Custom field data migration	Phase 6

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Lessons From the SAMinfo.com Migration

SAM Magazine (Ski Area Management) has been publishing since 1962. SAMinfo.com, their digital hub, carried decades of articles, buyer guides, industry news, and a subscriber base that relied on the site daily. The Joomla-to-WordPress migration had to be invisible to users and transparent to search engines.

A few things we learned from that project that apply to any large-scale migration:

• URL patterns matter more than individual URLs. A site with 30,000 articles doesn’t need 30,000 individual redirect rules—it needs 8 well-crafted regex patterns that cover all the URL structures Joomla was generating. Getting the patterns right upfront saved hundreds of hours.
• Content audit reveals unexpected complexity. The pre-migration content audit revealed a category structure that had grown organically over 15 years and no longer reflected the site’s actual information architecture. The migration became an opportunity to restructure—with the right redirect strategy in place.
• Staging environment parity is non-negotiable. Running the migration on staging before production meant we caught three categories of issues (image path errors, metadata import gaps, category taxonomy mismatches) before they ever touched the live site.
• Post-launch monitoring saves rankings. In the 72 hours after DNS cutover, Search Console flagged 47 404 errors from a URL pattern we’d missed. Because we were monitoring actively, those redirects were live within 2 hours—before Google had time to de-index those pages.

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Do You Need Help With Your Joomla Migration?

This checklist covers the technical requirements. What it can’t cover is the judgment calls that come up in every migration—the unexpected content structures, the legacy extension that doesn’t have a good replacement, the custom Joomla component that needs to be rebuilt from scratch.

If you’re planning a Joomla to WordPress migration for a large site and want an experienced team to handle it (or just to review your approach), our WordPress development team has been doing this for 15 years. We also offer WordPress custom development for any functionality that doesn’t have an off-the-shelf plugin solution.