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How to Fix 404 Spikes After a Site Migration
404 spikes after migration can hurt traffic and sales, but with bulk redirects and real-time monitoring you can quickly restore broken links and keep customers on active pages.
4 minutes, 47 seconds
Moving your store to Shopify is an exciting milestone, but it often comes with a lot of broken links. If your old URLs don't match your new Shopify structure, customers and search engines will hit 404 error pages, killing your conversion rate and SEO rankings.
This guide explains how to identify the source of these spikes and resolve them before they impact your bottom line.
Quick Answer
You can fix 404 spikes on Shopify by implementing a bulk 301 redirect strategy immediately after migration. The most effective method is using an app like SC Easy Redirects to map your old URLs (from platforms like Magento or Volusion) to your new Shopify pages via CSV upload. This restores your SEO authority and ensures a seamless transition for returning customers.
What is a 404 Spike?
A 404 spike occurs when a high volume of users or search engine crawlers attempt to access pages that no longer exist at their original URL. During a migration, this happens because Shopify’s URL structure (e.g., /products/name) often differs from other platforms.
Who Needs to Worry About Website Migration Errors?
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Merchants moving from Magento, Volusion, or WooCommerce.
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Stores with high organic search traffic.
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Brands with thousands of indexed product pages.
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Marketing teams running active backlink campaigns.
Why Fixing 404s Matters for You
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Protects SEO Rankings: Prevents Google from de-indexing your pages.
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Saves Revenue: Ensures customers clicking old links still reach a product.
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Maintains Brand Trust: Avoids the Page Not Found frustration.
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Reduces Bounce Rate: Keeps traffic flowing through your sales funnel.
How to Set Up a Recovery Plan for Migration Spikes
Step 1: Audit Your Old URLs
Before or immediately after migrating, compile a list of all URLs from your previous platform. You can find these in your old sitemap or via Google Search Console.
Step 2: Install SC Easy Redirects
Install the SC Easy Redirects app to handle the heavy lifting.
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Navigate to the Bulk Upload section.
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Download the CSV template for 301 redirects.
Step 3: Map and Upload Redirects
Create a map where the old URL points to the new Shopify URL.
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Group redirects to keep track of collections vs. products.
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Upload the CSV to the app to process hundreds or thousands of links instantly.
Step 4: Monitor for Stray URLs
Even with a plan, some links will be missed.
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Enable Automatic 404 Tracking in the Pro plan.
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Review the real-time dashboard to see which old links are still being hit.
Step 5: Verify Redirect Health
Test your top-performing old links manually. Check your Shopify Analytics to see if the 404 count is decreasing and ensure users are landing on the correct relevant pages.
Easy Redirects Examples and Use Cases
Case 1: The Mega-Migration (Magento to Shopify)
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Business: Novotech (Canada)
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Problem: Complex URLs where one product could be reached by 5 different links in Magento.
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Solution: Used SC Easy Redirects to perform magic mapping of all 5 unique URLs to a single Shopify page.
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Result: Zero loss in traffic despite a highly complicated URL legacy.
Case 2: The Long-Term Archive
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Business: BinkyBunny.com (USA)
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Problem: 17 years of history across 3 different platforms created stray URLs.
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Solution: Connected with support for a custom 404 clearing strategy.
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Result: Cleaned up nearly two decades of broken links, preserving SEO authority.
Best Practices for Migration Management
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Always use 301 (permanent) redirects, never 302 (temporary).
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Prioritize your highest-traffic pages first.
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Redirect to the most relevant product, not just the homepage.
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Use bulk upload tools to save dozens of hours of manual entry.
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Keep your redirects active for at least one year post-migration.
Summary
Migration-related 404 spikes are common but dangerous for your bottom line. By auditing your old URLs and using a bulk management tool, you can protect years of SEO work in minutes.
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Map old URLs to new ones.
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Bulk upload via CSV.
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Monitor for real-time errors.
If you want help setting this up, you can try SC Easy Redirects for free here.
Frequently asked questions (FAQs)
With SC Easy Redirects, the links work instantly the moment you hit Save or finish a bulk upload.
No, 301 redirects are handled at the server level and do not significantly impact page load speed for the user.
Yes, you can redirect any URL path, including blogs, pages, collections, and products.
Google will eventually remove those pages from search results, and you will lose all the link juice and rankings associated with them.
