Key Takeaways
- Theme migrations regularly break internal links in ways that aren’t immediately visible
- The biggest risk areas: hardcoded URLs in theme sections, custom page content, and metafields
- Run a broken link scan immediately after any theme change — before and after
- A pre-migration checklist prevents most problems; a post-migration scan catches the rest
Switching to a new Shopify theme feels like a clean slate. A fresh design, faster performance, better mobile experience. What most merchants don’t realize is that theme migrations are one of the most common triggers for sudden, widespread broken links — and the SEO damage can persist for months if not caught quickly.
Here’s what breaks during a Shopify theme migration, why it’s hard to notice, and how to protect yourself.
Why Theme Migrations Break Links
Shopify themes aren’t just visual skins — they contain structured content that merchants have added over time. When you migrate to a new theme, that content doesn’t always transfer cleanly.
The core problem: different themes store and display content differently. Content that lived in one theme’s custom sections, blocks, or settings doesn’t automatically map to the equivalent slots in a new theme. In the migration, some of that content gets dropped, reformatted, or broken.
Hardcoded URLs in Theme Sections
Many merchants use Shopify’s theme editor to add banners, featured collections, and promotional blocks that include links to specific products or collections. These URLs are often stored as text strings in theme settings files.
When you switch themes, those settings don’t transfer — they’re tied to the old theme’s structure. Any link that was configured in your old theme’s sections and blocks is simply gone in the new one. If you don’t recreate those links, or if you recreate them with incorrect URLs, broken links result.
Most commonly affected: Homepage banners, featured collection links, promotional callout sections, “Shop the look” blocks.
Custom Page Content with Embedded Links
Content you’ve written in Shopify’s page editor — About pages, FAQ pages, policy pages, landing pages — transfers during a theme migration because it’s stored in Shopify’s database independently of your theme. However, any links embedded within that content remain exactly as written.
If those links pointed to products or collections using URLs that have since changed, the migration doesn’t fix them. Theme migrations are actually a good moment to discover link rot in your page content that may have accumulated for months or years.
Blog Post Links
Your blog content migrates with your store, but the same issue applies: links embedded in blog posts remain as-is. A migration doesn’t heal links that were already broken, and if the migration process involved any URL structure changes, previously valid links may now be broken.
Metafield Content
Some merchants and developers use Shopify metafields to store rich content — long descriptions, size guides, ingredient lists — that may contain embedded links. During theme migrations, this content persists but may not display correctly in the new theme, and any links within it may not be validated or updated.
Navigation Menu Links
Navigation menus in Shopify are stored separately from themes and generally transfer intact. However, if your old theme had custom navigation elements — a mega menu, a secondary navigation, a mobile-specific menu — those are typically theme-specific and need to be rebuilt in the new theme. In the process of rebuilding, URLs can easily be entered incorrectly.
The Hidden Timeline of Link Damage
What makes theme migration link damage particularly tricky is the timeline of discovery.
Day 1 (migration day): The new theme looks great. You review the homepage, browse a few products, test checkout. Everything visible seems fine. Broken links in blog posts, page content, and non-prominent sections go unnoticed.
Day 7–14: You might start noticing specific broken links if customers report them or if you happen to click through older blog posts. But you likely attribute these to pre-existing issues, not the migration.
Day 30–60: Google recrawls your store and begins discovering the 404 errors. These appear in Google Search Console with a delay.
Day 60–120: Ranking impacts begin to appear for pages that relied on the now-broken internal links for their authority distribution.
By this point, the connection between the theme migration and the ranking changes is difficult to make — especially if other changes happened in the interim.
The Pre-Migration Checklist
Protecting your SEO through a theme migration starts before you switch.
Step 1: Document all custom links in your current theme
Open your current theme editor and review every section and block on every page template. Screenshot or record every URL that’s been configured: collection links, product links, promotional banner destinations, featured item links.
Step 2: Export your current navigation menus
Go to Online Store → Navigation and note every link in every navigation menu. You’ll need to verify these are correctly recreated in your new theme.
Step 3: Run a baseline broken link scan
Before you migrate, scan your store for broken links. This gives you a baseline: any broken links that appear after migration that weren’t present before are migration-caused. This also gives you a clean record of what needs fixing regardless of the migration.
Step 4: Review your URL redirect list
Export your current URL redirects. After migration, verify these are still active and haven’t been accidentally modified.
The Post-Migration Checklist
Immediately after going live with the new theme:
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Recreate all documented custom links from your pre-migration notes. Don’t rely on memory — work from your screenshots.
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Test navigation menus — click every link in every navigation menu on both desktop and mobile. This takes 10 minutes and catches the most visible broken links.
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Check homepage — click every link on your homepage. Banners, featured collections, promotional blocks, footer links.
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Run a full broken link scan — use a tool that scans your entire store’s content, not just the pages you visit manually. This catches broken links in blog posts, pages, and product descriptions that you’d miss in a manual review.
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Check Google Search Console — monitor the Pages report and Crawl stats over the following two to four weeks for any unexpected spikes in 404 errors.
If You’ve Already Migrated and Found Broken Links
The fix process is the same as fixing broken links in any context — it’s just more time-sensitive because migration-caused broken links can affect many pages simultaneously.
Prioritize by impact:
- Homepage and navigation links first (highest visibility, most authority)
- Top-traffic blog posts and pages
- Product and collection descriptions
- Older, lower-traffic content
For each broken link, decide whether to:
- Redirect the broken URL to the correct destination (best for deleted or moved pages)
- Update the source link directly in your content (best for links in editable content)
A dedicated Shopify scanning app can surface all of them at once and suggest the right fix for each — significantly faster than hunting through content manually.
Making Theme Migration a Safer Process
The merchants who come through theme migrations with the least SEO disruption follow one principle: treat the migration as a content audit, not just a design change.
Every section you rebuild in the new theme is an opportunity to verify that the links in it are correct. Every blog post or page you review post-migration is an opportunity to update outdated links. The extra effort during the migration pays for itself many times over in avoided SEO damage.
Relink’s broken link scanner is the fastest way to audit your Shopify store after a theme migration. Run a scan, see every broken link, apply fixes in bulk. Install free.