Do 302 redirects really pass PageRank during a site migration?

Do 302 Redirects Really Penalize PageRank?

The prevailing belief in the SEO community is that only 301 redirects fully pass PageRank. This idea is based on the technical distinction between permanent (301) and temporary (302) redirects.

John Mueller dispels this myth by asserting that 302 redirects do not block the transmission of value. The search engine now treats both types of redirects similarly in terms of authority transfer. The nuance lies in the duration: Google interprets the intent behind each HTTP code but does not automatically penalize a 302.

Why Does Google Still Recommend 301?

The recommendation of 301 for permanent changes is not about PageRank, but rather about semantic signaling. A 301 explicitly indicates to the engine that the old URL will never return.

With a 302, Google may hesitate longer before switching indexing to the new URL. The risk? A period of overlap where both versions coexist in the index, potentially diluting your signals. The 301 speeds up consolidation and clarifies the intent of a definitive migration.

How Does Google Decide Which URL to Index?

The engine observes the behavior of redirects over time. If a 302 remains active for weeks or months, Google eventually treats it as a de facto 301. The algorithm adapts to reality rather than strict HTTP code.

This flexibility explains why some migrations with 302s work properly. The processing time may simply be longer, and the risk of ambiguity increases. To avoid confusion, the 301 remains the safest and fastest choice.

• 302 redirects pass PageRank, contrary to popular belief
• The 301 is still recommended for permanent migrations because it clarifies intent
• Google interprets long 302s as implicit 301s, but with a longer processing delay
• The main risk of a 302: a floating period where both URLs coexist in the index
• The choice of HTTP code sends a strong semantic signal to the engine

Does This Statement Contradict Real-World Observations?

For years, SEOs have observed traffic drops after migrations using 302s. These observations are not false, but they primarily reflect a timing issue and ambiguous signals. While PageRank may transfer correctly, indexing can lag.

Migration tests have shown that 301s stabilize positions 2 to 3 times faster than 302s. The issue, therefore, is not about value transmission, but rather the confusion it generates. Google hesitates, tests, and verifies. With a 301, there is no ambiguity.

What Nuances Should Be Added to This Statement?

Mueller specifically refers to PageRank transmission, not processing speed or error risk. This is a crucial distinction that many practitioners have missed in post-announcement discussions.

A 302 may technically work, but it introduces an unnecessary risk variable into an already complex operation. In migrations, you want to minimize unknowns, not multiply them. [To be checked]: Google has never published numerical data on the average processing time of a long 302 vs. a 301.

In What Cases Would a 302 Be Acceptable?

If you are testing a new structure for a few days or weeks, using a 302 makes sense. It signals that the old content may return, and Google keeps the old URL in standby. This aligns with the intent.

However, for a definitive domain migration, using a 302 is technically possible but strategically risky. You waste valuable time and create an avoidable uncertainty. The crumbs of PageRank do not compensate for the risk of poor index consolidation.

What Should You Do If Your Migration Is Already Using 302s?

No immediate panic. If your 302 redirects have been in place for several weeks and traffic is stabilizing, Google has probably already treated the migration as definitive. Check in Search Console which URL is indexed as canonical.

If you notice both versions coexisting in the index or unusual position fluctuations, switch to 301 immediately. The switch is straightforward on the server side and speeds up consolidation. There is no risk of double penalties: you are just clarifying the signal.

What Mistakes Should Be Avoided During a Domain Migration?

Never mix 301 and 302 in the same migration. Choose one code and apply it uniformly to all URLs. A patchwork of redirects creates algorithmic confusion and extends processing time.

Another trap is thinking that 302 is “safer” because it is reversible. In a definitive migration, this reversibility is a false advantage. You won’t go back, and the ambiguous signal costs more in visibility than the theoretical gain in flexibility. Own your choices and signal them clearly to the engine.

How Can You Verify That Your Migration Is Being Processed Correctly?

Use the URL inspection tool in Search Console to check that the new URL is recognized as canonical. If Google is still displaying the old URL after 3-4 weeks, your signal is too weak or ambiguous.

Also, monitor the server logs: if Googlebot continues to crawl heavily the old domain after a month, it’s a sign that consolidation is not complete. A clean migration with 301s reduces this residual traffic to nearly zero within 2-3 weeks.

• Use 301 redirects for any definitive migration of domain or structure
• Check in Search Console that the new URL is recognized as canonical
• Apply a unique code (301 or 302) to all URLs, without mixing
• Monitor logs for an unusual residual crawl of the old domain
• If 302s persist after several weeks, switch to 301 immediately
• Use the address change tool in Search Console to speed up processing