Definition
The HTTP 301 (Moved Permanently) status code indicates that the requested resource has been permanently moved to a new URL. It is not technically an error but a permanent redirect. Browsers and search engines automatically follow the redirect to the new address. In SEO, a 301 transfers nearly all link value (link juice) to the new URL, making it the recommended tool for managing URL changes, site migrations, or deleted pages. Google confirmed in 2016 that 301 redirects pass 100% of PageRank. It is important not to create redirect chains (301 to 301 to 301) as this can slow crawling and marginally dilute value.
Key Points
- Indicates a permanent move to a new URL
- Transfers nearly all SEO value (link juice)
- Recommended method for site migrations and URL changes
Practical Examples
Domain migration
During a migration from old-domain.com to new-domain.com, 301 redirects are set up on every URL to transfer SEO authority.
URL structure change
A site reorganizes its categories and redirects /blog/article to /resources/article with 301s, preserving 95% of SEO value.
Frequently Asked Questions
Google has confirmed that 301 redirects now transfer all PageRank. Historically, a 10-15% loss was estimated, but that is no longer the case.
Use a 301 for permanent changes (migration, restructuring). Use a 302 for temporary changes (maintenance, A/B testing).
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Last updated: 2026-02-07