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Handle a large website conversion as a controlled migration, not a single launch-day switch. First determine whether the site’s visible URLs will change: a domain, protocol, path, or site-merge move needs a tested old-to-new URL map and relevant redirects; a hosting or CDN move with the same URLs is mainly an infrastructure and DNS cutover. Inventory the pages and assets people and search engines use, test the destination, then monitor URL-level evidence after launch. Google says medium-sized sites can take a few weeks or more for most pages to move in its index, and larger sites can take longer; no schedule guarantees that traffic or rankings will stay unchanged.
Start by identifying what is changing
“Website conversion” can mean a domain change, a switch from HTTP to HTTPS, a new URL structure, a merger of sites, a hosting or CDN move, a CMS migration, a redesign, or several of these at once. For search planning, the most important first question is whether a page’s visible URL changes.
| Migration path | What changes | Main search and operations work |
|---|---|---|
| URL-changing move | Some or all page URLs change, such as during a domain, protocol, path, or site-merge move. | Map old URLs to relevant new destinations, implement and test redirects, update canonicals and sitemaps, and monitor old and new URLs. |
| Hosting or CDN move | The infrastructure serving the site changes, but visible URLs stay the same. | Prepare and test the new environment, switch DNS, monitor service and crawling on both environments, and keep the previous setup available during the transition. |
| Combined change | URLs, infrastructure, design, CMS, or content change together. | Separate major changes where practical so problems can be diagnosed. If they cannot be separated, keep a change log and checks that help distinguish URL, rendering, infrastructure, and content issues. |
A redesign or CMS change does not automatically require new URLs. Treat the URL plan and the infrastructure plan as distinct decisions, even if the same project includes both.
Build an inventory that reflects the real site
A navigation export alone is not a migration inventory. Important pages may be orphaned from menus, receive search traffic, appear in old links, or be requested directly by users. Gather candidate URLs from multiple sources and reconcile duplicates, parameters, trailing-slash variants, and other URL patterns before deciding what to preserve.
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- Server logs: Find URLs requested by users and crawlers, including paths that may not appear in the CMS export.
- Analytics: Identify URLs that have received visits during a time window suited to the site’s traffic patterns.
- Search Console: Review known URLs and link data to find pages that have search visibility or external links.
- Assets: Include image, video, JavaScript, and CSS URLs where they need to remain available or move to new locations.
For each candidate, record its current URL, intended status, destination URL if it is moving, and how the mapping will be implemented. Decide deliberately when a page is retired: redirect it to a genuinely useful equivalent if one exists; do not manufacture an unrelated destination just to avoid a 404.
Choose a rollout that you can observe
Pilot a representative section when feasible
For a large site, Google recommends initially moving a piece of the site when it is technically possible, so the team can observe effects on traffic and indexing. A pilot is not proof that every part of the full migration will work: the selected section may not represent different templates, URL patterns, or operating conditions across the site.
Choose a section that changes relatively little and is not dominated by unpredictable events. Make sure it exercises the important migration mechanics—such as redirect rules and page templates—rather than selecting a small, unusual corner that avoids them. Record the pilot’s scope, launch time, and observed issues so the full rollout can use what was learned.
Use a staged or whole-site move only if it fits the architecture
Some systems allow a site to move in sections; others make that impractical. A staged rollout can make it easier to isolate defects, but it also means old and new patterns may coexist for a period. A whole-site cutover may be operationally simpler for tightly coupled systems, but it leaves less room to learn from an early slice. The right choice depends on the site’s technical structure and the team’s ability to monitor each stage.
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Prepare and test before launch
- Set scope and baseline. Document which domains, protocols, paths, sections, and assets are changing. Capture a pre-launch view of important traffic and indexing patterns so post-launch comparisons have context.
- Finalize the URL map for URL moves. Match each old URL to its closest useful new equivalent. Store the mapping in a form the server or CMS can use; common patterns may be handled with rewriting rules, while irregular mappings may need a database or equivalent lookup. Test individual cases and bulk lists.
- Test the destination environment. Review representative templates and URLs, redirect behavior, canonical annotations, robots.txt rules, noindex directives, and sitemap contents. Verify that pages load as intended before real traffic is sent to the destination.
- Check staging controls. Remove crawl or indexing blocks that were intended only for staging when the live site is ready. Do not remove restrictions that are intentionally required for private or non-public areas.
- Plan capacity. A migration can lead to additional crawling because requests to old URLs may be redirected while Googlebot also crawls other URLs. Google advises especially large sites to notify their hosting providers and plan for the additional load.
- Prepare measurement and ownership. Verify the relevant Search Console properties and prepare the domain-move workflow if applicable. Decide whether to preserve analytics continuity or create a separate profile for clean reporting separation; vendor-specific analytics configuration is outside the search-migration steps here.
Launch according to the migration type
When visible URLs change
Enable permanent server-side redirects from old URLs to relevant new equivalents when the destination is ready. Keep the new pages’ canonical annotations pointed at the new URLs. Submit a sitemap containing the new URLs, and inspect submitted and indexed URLs in Search Console. For a domain move, use Search Console’s move workflow where applicable.
Avoid sending a large set of unrelated old pages to the home page or another generic URL. Google warns that such redirects can confuse users and may be treated as soft 404s. A redirect is not a substitute for choosing a relevant destination.
When only hosting or the CDN changes
Prepare and test the new infrastructure, then change DNS to point to it. Keep the old environment available while traffic shifts and verify that users and Googlebot receive the expected content from the new setup. Do not retire the previous infrastructure just because the DNS change has been made; use traffic and log evidence to establish that it is no longer serving requests that need it.
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Check the migration with independent signals
No single dashboard explains every failure. Pair search data with direct URL checks and server evidence, and compare old and new properties where relevant.
- Search Console: Check sitemap processing, index status, crawl errors, and unexpected indexing patterns. For a URL move, compare the old and new properties; the usual direction is old-site traffic falling while new-site traffic rises.
- Analytics: Compare traffic using a consistent definition and annotation of the cutover. A reporting discontinuity can look like a traffic loss, so verify measurement continuity before interpreting a sharp change.
- Server access and error logs: Review Googlebot and ordinary user requests, redirect destinations, response errors, and whether requests are reaching the intended environment.
- URL samples and crawls: Test representative old and new URLs, then crawl larger URL lists to find broken redirects or unexpected responses. Google names Screaming Frog as one possible crawler for checking redirects; it is an option, not a requirement.
- DNS and infrastructure checks: For hosting moves, check whether DNS changes are visible using public DNS-checking tools, and continue monitoring both environments as traffic shifts.
Visual snapshots can complement—not replace—URL, status-code, content, and search checks when teams need to review how representative pages render. ScreenshotNeo is a website screenshot API and MCP server for developers; its website screenshot service can capture a page, but a screenshot by itself does not verify redirects, indexing, or application behavior.
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For a quick visual snapshot of a representative page, ScreenshotNeo takes a screenshot with one GET request. The example uses Stripe as the sample target; replace the URL with a page you are authorized to capture. See the ScreenshotNeo API documentation for request options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo accepts cookie or consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each of those steps can be turned off. Bot checks and CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, with response headers indicating the page verdict and whether the request was billed. Its MCP server gives AI agents tools named take_screenshot, get_page_info, and capture_pdf. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000 shots. These captures are useful as visual references, not a substitute for migration validation.
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| Symptom | Likely cause to check | Next action |
|---|---|---|
| Old URLs land on the wrong page or return an error. | The old-to-new mapping is incorrect, the destination does not exist, or the redirect rule is not being applied as expected. | Test the affected old URL and its intended destination directly; correct the mapping and retest samples and bulk lists. |
| Many old pages land on the home page. | Unrelated URLs have been sent to one generic destination. | Replace generic redirects with relevant destinations where available. Retire URLs without useful equivalents deliberately rather than disguising them. |
| New pages are not being indexed as expected. | Staging-only noindex or robots.txt blocks may remain, canonicals may still point to old URLs, or the sitemap may still contain old locations. | Inspect the affected page’s directives and canonical, review robots.txt, and submit the new-URL sitemap. |
| Crawling or serving becomes unstable after a hosting move. | The new environment may not have enough capacity, or requests may still be reaching an unhealthy server. | Use access and error logs to identify which environment is serving requests, then address capacity or routing problems before retiring the old setup. |
| Traffic or indexing fluctuates shortly after launch. | Search systems process URLs over time, but actual errors may also be present. | Do not infer success or failure from one aggregate graph. Inspect URL samples, logs, errors, redirects, sitemaps, and old-versus-new properties. |
| Traffic appears to disappear in analytics. | The migration may have coincided with a measurement or reporting change. | Check analytics continuity and compare with server logs and Search Console before attributing the whole change to search performance. |
Set realistic timing and performance expectations
Google says that for medium-sized websites, it can take a few weeks or more for most pages to move in its index; larger websites can take longer. Processing happens URL by URL, and there are no fixed crawl frequencies: crawl speed depends on site size and the speed of crawling that is possible. Treat that duration as an expectation, not a deadline or a guaranteed recovery period.
Google states that permanent redirects do not cause a loss in PageRank. That statement concerns PageRank signals; it does not guarantee unchanged rankings, traffic, or timing during a large migration. If Googlebot encounters serious serving problems during a hosting change, the expected crawl pattern is not a reason to ignore them.
Capacity and observability are practical reliability concerns. Keep enough infrastructure available for normal demand and migration-related crawling, and do not judge the cutover solely by a short-term crawl-rate change. For a hosting move, Google describes a temporary crawl-rate drop followed by a rise over the next few days as normal when Googlebot is not encountering serious serving problems.
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The steps above address search migration and hosting cutovers. They are not a complete CMS conversion plan: database and media transformation, application QA, accessibility checks, privacy and legal review, analytics-vendor configuration, and procedures for non-Google search engines require their own platform-specific validation. Include the appropriate owners and acceptance checks for those workstreams rather than assuming redirects alone validate the whole conversion.
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