A 301 redirect is a permanent HTTP status code that tells search engines and browsers that a page has permanently moved to a new URL. When implemented correctly, a 301 redirect transfers approximately 90-99% of the original page's link equity (ranking power) to the destination URL, making it the preferred method for URL changes, domain migrations, and consolidating duplicate content.

How 301 Redirects Work

When a user or search engine bot requests a URL that has a 301 redirect, the server responds with the 301 status code and the new location. The browser or bot then automatically follows the redirect to the new URL. This happens in milliseconds and is transparent to users.

  • Server-side processing: The redirect happens at the server level before any page content loads, making it fast and reliable
  • Link equity transfer: Google has confirmed that 301 redirects pass full PageRank to the destination URL
  • Permanent signal: Search engines eventually drop the old URL from their index and replace it with the new one
  • User experience: Visitors are seamlessly sent to the correct page without seeing an error
Key point: A 301 redirect is different from a 302 redirect. Use 301 for permanent moves and 302 for temporary ones. Using the wrong type can cause search engines to keep indexing the old URL instead of the new one.
301 Redirect Flow Old URL User or bot requests the old page Server 301 Server responds with permanent redirect New URL Browser loads the new destination Link Equity 90-99% of link juice passes through

When to Use 301 Redirects

  • Domain migration: Moving from oldsite.com to newsite.com
  • URL structure changes: Changing /blog/my-post to /articles/my-post
  • HTTPS migration: Redirecting http:// to https:// versions
  • Consolidating pages: Merging duplicate or thin content into one stronger page
  • Deleted pages: Redirecting removed pages to relevant alternatives instead of showing 404 errors

Why It Matters for SEO

301 redirects are essential for preserving search rankings during any URL change. Without them, you lose all the link equity and ranking signals built up over time. Search engines treat the old and new URLs as completely separate pages, meaning months or years of SEO work can vanish overnight. Properly implemented 301 redirects ensure a smooth transition that maintains your search visibility and user experience.