What Is a 301 Redirect?
A 301 redirect permanently sends visitors and search engines from one URL to another, preserving most ranking value. Best practices, with an example.
A 301 redirect is a permanent server-side instruction that automatically sends visitors and search engines from one URL to another. It passes nearly all of the ranking value and link equity from the old URL to the new one.
Why 301 redirects matter
Without a 301 redirect, changing a URL means losing accumulated backlinks and rankings tied to the old address, visitors and search engines simply hit a dead page. It’s considered the standard, SEO-safe way to permanently move or retire a page, whether that’s a single product URL change or an entire site migration to a new domain. Skipping this step during a redesign or replatform is one of the most common, and most costly, technical SEO mistakes, entire categories of accumulated authority can evaporate within days if old URLs suddenly 404 instead of redirecting.
How 301 redirects work
- A visitor or crawler requests the old URL.
- The server responds with a 301 status code, explicitly signaling a permanent move, along with the new destination URL.
- The browser or crawler automatically follows the redirect to the new URL, usually instantly and invisibly to the visitor.
- Search engines consolidate ranking signals onto the new URL over time, transferring most, though not always literally all, of the accumulated authority.
301 redirect best practices
- Redirect to the most relevant equivalent page, not just the homepage as a catch-all, a mismatched redirect wastes much of the transferred value.
- Avoid redirect chains. URL A redirecting to B redirecting to C adds unnecessary latency and can dilute the signal passed through each hop.
- Update internal links to point directly to the new URL rather than relying on the redirect for internal navigation.
- Keep redirects in place long-term, don’t remove them after a few months assuming all value has already transferred, old backlinks and bookmarks can persist for years.
- Map redirects individually during a site migration rather than defaulting everything to the homepage, precise mapping preserves far more ranking value.
301 redirect vs. 302 redirect
| Factor | 301 redirect | 302 redirect |
|---|---|---|
| Meaning | Permanent move | Temporary move |
| Ranking signal transfer | Passes nearly all value to the new URL | Original URL generally keeps its value |
| Best used for | Permanent URL changes, migrations, retired pages | Short-term promotions, A/B tests, temporary maintenance |
Real example
For example, when a company renames a product page from /old-product to /new-product, a 301 redirect ensures anyone visiting the old link, including search engines still holding it in their index, lands on the new one instead of hitting a broken page, preserving the accumulated backlinks and rankings tied to the original URL.
301 redirects and AI search
Properly maintained 301 redirects help AI crawlers reach the correct, current version of content the same way they help traditional search engines, reducing the odds of an AI-generated answer citing a dead or outdated URL that should have forwarded to a live page instead.
FAQ
Does a 301 redirect pass 100% of ranking value?
Not necessarily exactly 100%, but Google has stated 301 redirects pass the vast majority of ranking signal, close enough that it’s treated as the standard, safe method for permanent moves.
How long should I keep a 301 redirect in place?
Indefinitely, ideally. Old backlinks, bookmarks, and even indexed URLs can resurface or get clicked years later, removing a redirect too early turns those into broken links.
Should I redirect everything to my homepage during a site migration?
No, this is a common shortcut that wastes most of the value. Map each old URL to its most relevant new equivalent individually whenever possible.
Can too many redirects slow down my site?
A single redirect adds negligible delay, but long redirect chains, several hops in sequence, can noticeably add latency and should be flattened to a single direct redirect where possible.
Related terms
Every URL you retire needs a 301, not a shrug. The backlinks and rankings attached to it don’t disappear on their own, they just go to waste if you let the page 404 instead.