A redirect loop happens when a page redirects to another page, then back again, or through a chain that never reaches a final destination. Browsers usually show an error such as “too many redirects.” For SEO, a redirect loop blocks crawlers and users from reaching the page, wastes crawl budget, and can stop important pages from being indexed properly.
Why a redirect loop matters for SEO and UX
When Googlebot hits a redirect loop, it cannot access the content behind the URL. That means search engines may drop the page from results, fail to pass ranking signals correctly, or spend less time crawling other useful pages on your site. For users, the issue is even more immediate: the page simply does not load. On commercial pages such as product, service, or lead generation URLs, that can directly reduce conversions and revenue.
Redirect loops often appear during site migrations, HTTPS enforcement, trailing slash changes, CMS plugin conflicts, or when multiple redirect rules overlap. Even a small configuration mistake can affect many URLs at once.
Common causes of redirect loops
Conflicting redirect rules
One rule may force the non-www version to www, while another sends it back to non-www. The same problem can happen with HTTP to HTTPS rules.
Plugin or platform conflicts
An SEO plugin, CDN setting, and server rule can all try to manage redirects at the same time. If they disagree, loops can happen.
Incorrect canonical or CMS settings
Sometimes a CMS is set to use one URL format, but server redirects force another. This mismatch can create repeated redirects.
Practical example and how to fix it
Example: your site redirects http://example page to HTTPS, but a reverse proxy incorrectly thinks the request is already secure and sends it back to HTTP. The browser keeps bouncing between both versions until it fails.
To fix a redirect loop:
1. Test the URL with a redirect checker or browser developer tools to see the full redirect path.
2. Identify every layer controlling redirects: CMS, plugin, server, CDN, and hosting panel.
3. Choose one preferred version of the URL, such as HTTPS + www, and make all rules support that single format.
4. Remove duplicate or contradictory rules.
5. Retest the URL and a sample of related pages, especially templates like product pages, blog posts, and category pages.
Best practices to prevent redirect loops
Keep a simple redirect policy for protocol, subdomain, and trailing slash format. Document redirect changes during migrations. Avoid stacking multiple tools that all manage redirects unless each has a clearly defined role. After major updates, crawl the site to catch “too many redirects” errors early. For SEO teams and founders, this is one of the highest-impact technical checks because it affects both rankings and usability at the same time.