How to do url mapping in SEO

URL mapping in SEO is the process of matching old URLs to new URLs when you're restructuring a website, migrating domains, or reorganizing content architecture. You're essentially creating a documented plan that tells search engines and users where content has moved, which preserves rankings and traffic during the transition.

Start by conducting a complete crawl of your existing site using tools like Screaming Frog, Ahrefs, or SEMrush to inventory every URL, its current ranking position, monthly traffic, and backlink profile. This inventory becomes your master list. Then map where each old URL should go on your new structure. The goal is to maintain relevance and context—a product page should map to a similar product page, not a category page, even if it's convenient. For large sites with hundreds or thousands of URLs, prioritize mapping your highest-traffic and highest-authority pages first, as these carry the most SEO weight. You'll create a spreadsheet with three columns: old URL, new URL, and redirect type (usually 301 for permanent moves). If you're consolidating multiple pages into one, note that too, since you'll implement 301 redirects from all old URLs to the single new destination. For content that truly has no equivalent, you'll either create a new home for it or plan a 410 (gone) status code if it's genuinely obsolete.

Once your mapping is documented, implement 301 redirects from old URLs to new ones. This is critical—301s tell search engines to pass ranking authority to the new URL. The redirect chain should be direct (old to new, not old to intermediate to new), and you should avoid redirect loops. Test your redirects thoroughly by sampling URLs from your mapping spreadsheet and confirming they land on the correct destination. Monitor your Google Search Console and Analytics in the weeks following implementation to watch for traffic patterns, crawl errors, and ranking movements. If you notice certain pages aren't recovering their previous traffic within a month, investigate whether the mapping was appropriate or whether the new page needs additional optimization. URL mapping done correctly means search engines reindex your content faster and preserve most of your SEO equity, making it an essential part of any site migration strategy.