What Is 301 Redirects

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Last updated: April 15, 2026

Quick Answer: A 301 redirect is a permanent HTTP status code (301 Moved Permanently) that forwards users and search engines from an old URL to a new one, preserving up to 90% of SEO value according to Google.

Key Facts

The 301 status code was defined in RFC 2616 in June 1999 as part of HTTP/1.1
301 redirects pass approximately 90% of link equity (ranking power) to the new URL
Google confirmed in 2016 that 301s are treated as permanent signals for indexing
Improper use of 301s can cause redirect chains, increasing page load by up to 500ms
Over 74% of top-ranking pages use proper redirect strategies during site migrations

Overview

A 301 redirect is a server-level instruction that permanently routes traffic from one URL to another. It's commonly used during website restructures, domain changes, or when consolidating content to prevent broken links.

Search engines interpret a 301 redirect as a permanent move, updating their indexes accordingly. This ensures users and crawlers are directed to the correct page without encountering 404 errors.

Permanent status: A 301 redirect signals to search engines that the original page has moved permanently, prompting them to transfer indexing authority to the new URL.
SEO preservation: Google treats 301 redirects as a way to transfer up to 90% of link equity, helping maintain search rankings after URL changes.
Implementation methods: 301 redirects can be set via .htaccess files (Apache), web.config (IIS), or through CMS plugins like WordPress Redirection.
HTTP status code: The 301 Moved Permanently response is part of the HTTP/1.1 standard defined in RFC 2616, published in June 1999.
User experience: Properly implemented 301s ensure visitors land on relevant content instantly, reducing bounce rates by up to 40% during site migrations.

How It Works

When a browser or search engine crawler requests a URL with a 301 redirect, the server responds with a status code 301 and the new location. The client then automatically forwards to the new URL.

Server Response: The web server returns a 301 status code along with the Location: header specifying the new URL, instructing the client to redirect.
Caching Behavior: Browsers and search engines cache 301 redirects, meaning subsequent visits go directly to the new URL without rechecking the old one.
Link Equity Transfer: According to Google, most of the ranking power from backlinks is passed to the new page, though not 100% due to signal degradation.
Redirect Chains: Multiple 301s in sequence (e.g., A → B → C) can slow load times; Google recommends avoiding more than two hops.
Implementation Example: In Apache, adding Redirect 301 /old-page.html https://example.com/new-page.html in .htaccess enforces the redirect at the server level.
CMS Integration: Platforms like WordPress allow 301 setup via plugins such as Redirection or Yoast SEO, simplifying management without code.

Comparison at a Glance

Understanding how 301 redirects differ from other types helps in choosing the right approach for specific scenarios.

Redirect Type	Status Code	Purpose	SEO Impact	Use Case
301 Redirect	301	Permanent move	Transfers ~90% link equity	Domain change, URL consolidation
302 Redirect	302	Temporary move	No equity transfer	Short-term promotions or A/B testing
307 Redirect	307	Temporary redirect (HTTP/1.1)	Preserves method and body	Secure form submissions during maintenance
308 Redirect	308	Permanent redirect with method preservation	Full equity transfer	APIs and POST request handling
Meta Refresh	HTML-based	Client-side delay redirect	Poor SEO, not recommended	Legacy systems without server access

While 301s are ideal for permanent changes, temporary options like 302 or 307 are better for short-term needs. Misusing 301s for temporary moves can mislead search engines and harm SEO recovery later.

Why It Matters

Proper use of 301 redirects is critical for maintaining SEO performance and user experience during website changes. Without them, traffic and rankings can plummet due to broken links.

Preserves SEO rankings: Sites that use 301s during migrations retain up to 90% of search visibility compared to those that don’t.
Prevents 404 errors: Redirecting old URLs avoids dead ends, reducing bounce rates and improving crawl efficiency for search engines.
Domain migrations: When switching from HTTP to HTTPS or changing domains, 301s ensure continuity of trust and authority.
Content consolidation: Merging multiple pages into one requires 301s to combine link equity and avoid duplicate content penalties.
E-commerce updates: Online stores use 301s when products are renamed or categories restructured to maintain traffic flow.
Mobile site routing: Some legacy mobile sites used 301s to redirect users based on device type before responsive design became standard.

Ignoring 301 redirects during site overhauls can result in significant traffic loss—sometimes over 50% in organic search visits. Proper planning and implementation are essential for long-term digital success.