Don't forget image, PDF, and download URLs during migrations
Images, PDFs, and downloads have their own URLs, links, and search queries. A separate asset inventory prevents broken links and lost resources.
For companies before a relaunch and for agencies, the key aspects of "migrating assets and downloads" are "independent asset inventory" and "technically intact output." The perspective "Content, Assets, and System Migration" shows how these two points interact in practice.
Published: 3 min read · Author: Sebastian Geier
How are image, PDF, and download URLs fully considered during a migration?
Every publicly relevant file requires the same targeting decision as a content page. In addition to redirect and status, the MIME type, file integrity, access rights, and internal and external embeddings must be correct after the migration.
Cross-check: "Media library gap"
A frequently linked PDF is moved to a new media structure, while an outdated form is not. The document receives a direct target with the correct file type and updated content links; for the form, internal references are removed, and the old address deliberately does not provide a replacement download.
Reference Maintenance
Percentage of prioritized asset URLs with verified target, status, and intact file response.
Number of internal embeds or download links to missing, redirected, or unreadable files.
Technically intact output
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Document the target, removal, access, MIME type, and necessary redirect decision for each file.
Automated and manual verification of the retrieval, integrity, and embedding of prioritized assets after migration.
Standalone Asset Inventory
Test criterion
Standalone Asset Inventory
File URLs from CMS, crawls, logs, and content references are merged.
Test criterion
Technically intact output
Target file is complete, publicly accessible as intended, and delivered with the correct content type.
Reference Maintenance Embeds, download buttons, and important external targets remain traceable or are intentionally removed.
Media Library Gap
Media Library Gap Only assets visible in the CMS are considered, while directly uploaded files are missing.
HTML Collection Redirect File requests land on a generic page instead of the expected document or image.
Corrupted Binary File – The URL responds successfully even though the download, file size, or format was corrupted during the migration.
What follows "Migrating Assets and Downloads"
A suitable in-depth resource is available Planning a Website Relaunch Without Avoidable Visibility Loss"How to plan a website relaunch without unnecessarily losing organic visibility?"
In addition: Find and resolve redirect chains without collateral damage.
If you want to put "Migrating Assets and Downloads" into practice, you can go to Robust Website Systems Refer back to this document. It focuses on "Content, Assets, and System Migration" and "Independent Asset Inventory."
Conclusion: Migrate Assets and Downloads
Assets are addressable content and not an invisible byproduct of a migration. Their inventory requires its own technical and editorial approval.
Sources and Further Information
These primary sources make assumptions, system boundaries, and testing methods for "Migrating Assets and Downloads" comprehensible.
Google Image SEO Best Practices — Google Search CentralThis documentation covers stable image URLs, image sitemaps, CDN domains, and the technical discoverability of migrated image resources.
Site Moves and Migrations — Google Search CentralGoogle requires a complete mapping and transfer of pages, images, videos, downloads, and other embedded resources during URL migrations.
Key Thesis
Assets are inventoried like HTML pages, assigned a destination or status, and checked after the migration begins. Embedded and external links are included in the same check.
What This Is Not About
A migration doesn't end with HTML pages because images, documents, and downloads have their own accessible URLs and external links.
What it's about
Assets are fully inventoried, assigned their new location or removal status, and checked in embedded content.
Relaunch, Migration & Domain Change
Synchronously update canonical tags, sitemaps, and hreflang during a relaunch
"Migrating Assets and Downloads" includes, as a separate check, the question: How canonical tags, sitemaps, and hreflang tags remain consistent during a relaunch?
Relaunch, Migration & Domain Change
Intercept removed content with relevant landing pages.
"Migrating Assets and Downloads" is supplemented by a separate decision: When is it advisable to redirect removed content to another page?
Insights Overview
All VELUNO Insights at a Glance
Further analyses on Website Systems, digital visibility, and robust working models.
Standalone Asset Inventory: Practical Next Check
An asset crawl should be compared with CMS and log data before export. The resulting list reveals which files must be retained, replaced, or demonstrably removed.