Can I create a WordPress Multisite from an existing independent WordPress site?
Briefly

Can I create a WordPress Multisite from an existing independent WordPress site?
"I'm currently working with a standalone WordPress site and exploring whether it's possible (and practical) to convert it into a WordPress Multisite network. The goal is to manage multiple related sites (shared plugins, themes, users) from a single dashboard, but I want to understand the real-world implications before proceeding. Here are a few things I'm trying to clarify: Is it technically safe to enable Multisite on an existing production site?"
"What happens to existing posts, pages, media, and users during the conversion? Are there common pitfalls related to permalinks, media uploads, or plugin compatibility? How does Multisite affect performance and maintenance compared to separate installs? Would it be better to migrate content into a fresh Multisite setup instead? I'm especially interested in hearing from developers who've done this on live sites - what went smoothly and what you'd do differently next time. Any best practices, warnings, or documentation you recommend would be appreciated. Thanks"
Enabling WordPress Multisite on a live site is technically feasible but requires full backups, a staging environment, and thorough compatibility testing. Existing posts, pages, media, and users remain in place, but database table structures, upload paths, and user-role handling can change and need verification. Common pitfalls include plugin and theme incompatibilities, permalink and .htaccess rewrites, media organization issues, and domain/subdomain mapping complexities. Multisite centralizes plugin and theme management and user administration but increases maintenance complexity and potential performance contention, so plan hosting, caching, and monitoring. Migrating content into a fresh Multisite reduces risk for complex or heavily customized sites.
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