You migrated your website — maybe to a new host, a new platform, or a new domain — and now visitors are landing on 404 error pages instead of your actual content. It's one of the most frustrating post-migration surprises a business owner can face, and unfortunately, it's also one of the most common.
The problem feels invisible until it isn't. You might not notice it right away, but your customers do. They're clicking links, landing on dead ends, and quietly leaving. Meanwhile, search engines are crawling your site, cataloging all those broken pages, and slowly downgrading your rankings. Every day this goes untreated is a day you're losing traffic, leads, and trust you worked hard to build.
Here's the good news: website 404 error pages after migration are fixable. They're not a sign that your site is permanently broken or that the migration ruined everything. They're a signal that some important housekeeping didn't get done during the move — and once it is, things can return to normal.
What Causes Website 404 Error Pages After Migration
A 404 error simply means the browser went looking for a page and couldn't find it at that address. During a migration, this happens for a handful of predictable reasons.
URL structure changes. Your old site might have had pages at addresses like /services/web-design, but the new site organizes things differently — say, /web-design-services. The content exists, but it's at a different address now. Any link that pointed to the old address — from Google, from another website, from a past email campaign — now hits a wall.
Missing redirect rules. When you move pages, the proper way to handle old URLs is to set up 301 redirects. These are instructions that tell browsers and search engines "this page has permanently moved — go here instead." If those redirects weren't set up during the migration, every old URL becomes a dead end.
Platform differences. Moving from one CMS to another (say, from WordPress to Webflow, or from a custom site to Shopify) often means the entire URL structure gets rebuilt from scratch. The new platform generates URLs differently, and without careful mapping of old addresses to new ones, the gaps multiply fast.
Incomplete content transfer. Sometimes pages, images, or attachments simply don't make it through the migration. If a file wasn't copied over correctly, any link pointing to it will return a 404. This is especially common with media libraries and document downloads.
DNS and domain changes. If the migration also involved switching domains or pointing an existing domain to a new server, timing issues or misconfigurations can create temporary — or sometimes permanent — 404 situations. If you've recently dealt with a hosting change, what happened after your hosting renewal might ring a bell.
What Fixing Website 404 Error Pages Actually Involves
Getting this sorted isn't just about fixing one broken link. It requires a methodical look at your site's full URL inventory and a plan for handling every address that no longer works.
The first step is discovering the scope of the problem. A crawl of your old and new site identifies which URLs existed before the migration and which ones are now returning 404s. This gives you a working list of what needs to be addressed.
Next, each broken URL needs to be mapped to its correct destination on the new site. If the page still exists, it just lives at a new address — a redirect sends visitors and search engines there automatically. If the page no longer exists, the redirect can point to a relevant category page or the homepage.
Those redirects are then implemented at the server or platform level. On most platforms, this is done through a configuration file or a built-in redirects tool. It's not something you can handle by editing content — it requires access to the right settings and a working knowledge of redirect syntax and rules.
After redirects are in place, the site gets crawled again to confirm that all the old URLs are resolving correctly and that no new errors were introduced. It's also worth checking whether any internal links within your site's own pages are pointing to old addresses that should be updated too.
If your site's Google Search Console account is set up, it's worth reviewing the coverage report there as well — it will show you how many 404s Google has indexed and whether they're clearing up after fixes are applied. Speaking of Google, 404 errors after a migration can quietly tank your rankings, which connects to a bigger issue some owners deal with: a site that suddenly stops showing up on Google.
Signs This Is Your Issue
Not sure if this is what you're dealing with? Here are the most common indicators:
- You recently moved your site to a new host, platform, or domain
- Visitors or customers have mentioned clicking a link and getting an error page
- You're seeing a drop in organic search traffic since the migration
- Google Search Console is showing a spike in "Not Found" errors
- Old blog posts, product pages, or service pages seem to have vanished
- Links you shared on social media or in emails are no longer working
- Your site overall seems fine, but specific pages return an error
If more than one of these sounds familiar, there's a good chance the migration left a trail of broken URLs behind it. This kind of thing can also happen after other types of changes, and it's worth understanding the broader pattern of websites breaking after updates or changes.
Should You Try to Fix It Yourself?
If you're comfortable in your website platform's settings and you're dealing with a handful of known broken URLs, you might be able to add a few redirects manually using your platform's tools. Most modern website builders have a redirect manager in their settings area.
But if the migration was complex — meaning a platform change, a domain switch, a large site, or all of the above — the number of broken URLs can be in the dozens or hundreds. Manually identifying and mapping all of them is tedious and easy to get wrong. One misconfigured redirect can create a redirect loop, and a missed URL continues bleeding traffic.
There's also the search engine side of things. Once 404s are resolved, you'll want to make sure search engines re-crawl the fixed pages so rankings can recover. That's a separate step many DIY attempts skip, which is why the traffic doesn't always bounce back even after the redirects are in place.
If you're not confident in the technical details, or you just don't have hours to spend troubleshooting, it's often worth getting someone else to handle it cleanly. If you're wondering whether you can even afford that, it helps to know what fixing a website actually costs before assuming the worst.
Common Questions About Website 404 Error Pages After Migration
Will my Google rankings recover after I fix the 404 errors? In most cases, yes — but it takes time. Once proper redirects are in place, search engines will follow them and eventually transfer the ranking value from the old URLs to the new ones. Recovery can take anywhere from a few weeks to a couple of months depending on how frequently Google crawls your site.
Do I need to fix every single 404, or just the important pages? You should prioritize pages that had traffic, backlinks, or were linked from other websites. Low-traffic pages that were rarely visited may not be worth the effort. However, any page that appears in Google Search Console's coverage report as a 404 is worth addressing, since it signals Google that your site has problems.
What's the difference between a 404 and a redirect loop? A 404 means the page wasn't found. A redirect loop means two pages keep sending visitors back and forth to each other, making the page impossible to load. Redirect loops are often created accidentally when setting up fixes for 404s — another reason careful setup matters.
How long does it take to fix 404 errors after a website migration? For a small site with a clear URL structure, it might take a few hours. For a larger site with hundreds of pages, a platform change, or messy URL mapping, it can take a full day or more to audit, plan, and implement correctly. The actual fix itself is less time-consuming than the audit that precedes it.
Can 404 errors after a migration affect my business beyond SEO? Absolutely. If you've sent emails, run ads, or shared links on social media pointing to old URLs, every one of those is now sending people to an error page. That means lost leads, frustrated potential customers, and wasted marketing spend — none of which shows up in your analytics as a clear line item but adds up quickly.
The Faster Path
If reading through all of this has made you more certain you don't want to handle it yourself, that's a completely reasonable place to land. Fixing website 404 error pages after migration requires technical access, methodical auditing, and an understanding of how redirects work across different platforms. It's not dangerous to attempt, but it's very easy to do incompletely.
Rune is a flat-rate website repair service built exactly for situations like this. You describe what's broken, and a real developer takes a look and fixes it — no hourly billing surprises, no waiting weeks for a quote. For something like a post-migration 404 cleanup, that kind of straightforward arrangement is often the fastest way to just get it done.
If you've been putting off addressing this because you weren't sure where to turn, how to find someone trustworthy to fix your website is a good place to understand what to look for. Or if you're already ready to stop dealing with it, visit runeintel.com and get started.