Should you really redirect old 404s to your homepage during a migration?

What does Google's statement really mean?

Google's position is clear: systematically redirecting all old error URLs to the homepage is pointless from an SEO perspective. The search engine treats these generic redirects almost like classic 404s.

Specifically, if a non-existent product page is redirected to the site's homepage, Google sees it as a thematically irrelevant redirect. The Googlebot detects this inconsistency and does not give this redirect any particular credit. The source page loses its potential PageRank just as if it displayed a direct 404 error.

Why is this practice so widespread then?

For years, SEOs have instinctively applied this rule: avoid 404s in Search Console at all costs. The idea was that a high number of errors would penalize the entire site. This belief originated from a time when crawling tools showed 404s as critical errors.

In reality, Google has always stated that 404s are normal on a live site. A site's natural evolution involves removing outdated content. The problem is not the HTTP 404 status code itself, but the 404s on pages that should still exist or that receive qualified traffic.

What differentiates a good redirect from a bad one?

A good 301 redirect points to thematically equivalent or very similar content. For example, a discontinued product redirected to its direct successor, or a consolidated category redirected to the new encompassing category.

A bad redirect sends the user to a generic unrelated page: the homepage, a too-broad category page, or worse, a custom 404 page that returns a 200 code. Google detects these patterns and ignores them entirely in its popularity calculations.

• 404s do not penalize a site as long as they concern truly deleted content
• Redirecting to the homepage to 'clean up' Search Console is a waste of time and crawl budget
• Only thematically relevant redirects retain and transfer PageRank
• Google prefers a clear 404 to a misleading redirect to a generic page
• The real migration work consists of smartly mapping equivalent content, not blindly redirecting everything

Is this statement consistent with real-world observations?

Absolutely. Migration audits regularly show that sites with thousands of redirects to the homepage do not perform better than those that let real 404s appear. Worse, these massive redirects waste crawl budget unnecessarily.

Conversely, sites that take the time to accurately map content equivalences retain their organic traffic better post-migration. The difference can be measured in the three months following the switch: up to 20-30% more traffic preserved on sites with an intelligent redirect strategy.

What nuances should be considered in practice?

First point: not all 404s are equal. A page that still receives direct traffic, quality backlinks, or clicks from the SERP deserves a relevant redirect. Leaving a 404 on a URL generating 100 monthly visits is a strategic mistake.

Second nuance: user experience matters. If a user clicks on an external link to your old site and lands on a raw 404, they leave immediately. A redirect to the homepage with a guiding message may at least keep them engaged. But this impact is UX, not direct SEO. [To verify]: Could Google interpret a disastrous bounce rate on these redirects as a negative signal? No official confirmation, but user behavior indirectly influences ranking.

In what cases does this rule not apply?

On a news site or blog with thousands of archived articles, leaving old URLs as 404s is acceptable. Conversely, on an e-commerce site reorganizing its taxonomy, each deleted product should be analyzed individually. If the product has 50 backlinks from authoritative sites, a coherent redirect target must be found.

Another exception: complete domain migrations. In this case, even pages without direct equivalents can benefit from a redirect to the closest category page, as long as it doesn’t fall into the trap of a generic homepage. The rule remains: the closer the target is thematically to the source, the better.

What concrete steps should be taken during a migration?

First and foremost, audit your current URLs to identify which still generate traffic, backlinks, or conversions. Use Search Console, Google Analytics, and a crawler like Screaming Frog to cross-check the data. Export the complete list of URLs with their performance metrics.

Next, create a mapping matrix: for each strategic old URL, define the best possible redirect target. Always prioritize exact thematic equivalence. If no equivalent page exists, consider whether you need to recreate that content or accept the loss. Only redirect to the homepage as a last resort, and only if the URL has no residual SEO value.

What critical mistakes should be absolutely avoided?

Never set up redirect chains. If A redirects to B, which redirects to C, Google may abandon the crawl or dilute the PageRank transfer. Each redirect must point directly to the final destination.

Also, avoid temporary 302 redirects during a definitive migration. A 302 tells Google that the change is temporary and that the old URL could return. Always use 301s to signal a permanent move. Finally, never redirect massively to a single page: this resembles manipulation, and Google may ignore these signals.

How can you verify that the strategy is working after migration?

Within 48 hours of going live, check in Search Console that the redirects are being crawled properly. Monitor the "Coverage" section for any anomalies: redirect chains, unintentional soft 404s, or server error spikes.

After one month, compare organic traffic page by page with the equivalent period before migration. Key pages should regain at least 80% of their initial traffic under their new URL. If any drop exceeds 30%, immediately audit the redirect chain and the relevance of the target.

• Extract all current URLs with traffic, backlinks, and conversions from the last 12 months
• Create a source URL → target URL mapping matrix with thematic relevance justification
• Only implement permanent 301 redirects, never 302s
• Validate that no redirect chains exist (A→B→C is prohibited)
• Leave real 404s as 404 errors, do not force redirects to the homepage
• Monitor Search Console daily for the first 15 days post-migration