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Microsoft 365 Migration

How to Migrate an Internal Website to SharePoint Online

Olivia MillerOlivia Miller Oct 10, 2026 869 views

Question details

The user needs to migrate a self-hosted internal website to SharePoint Online, which involves transferring files, converting pages, and rebuilding features.

How to Migrate an Internal Website to SharePoint Online
Product
SharePoint Online
Device & OS
not provided
Scenario
Migrating a legacy internal website to Microsoft SharePoint Online.
Observed behavior
The internal website requires manual file mapping, synchronization, and HTML to ASPX conversion because there is no single-click migration tool available.
Before you start

Ensure you have full administrative access to both the source internal website's hosting server and the target SharePoint Online environment before proceeding.

Solution 1Recommended

Perform Manual File Transfer and Page Conversion

Manually download your web assets and convert legacy HTML pages to SharePoint-compatible ASPX pages.

Because internal websites often use custom IP addresses and complex HTML architectures, there is no simple one-click migration tool. You must manually move your assets and convert standard web pages into SharePoint's native format.

1
Download Web Assets

Access your internal website's server and download all static files, images, documents, and HTML pages to a local drive.

2
Upload to SharePoint Online

Open your target SharePoint Online site, navigate to the desired Document Library or Site Assets, and upload or synchronize the downloaded files.

3
Convert HTML to ASPX

Convert the existing HTML pages to ASPX format. This step may require writing specific scripts or utilizing SharePoint development tools to ensure the layout and links render correctly in the SharePoint environment.

Perform Manual File Transfer and Page Conversion
Developer Assistance: Working with your organization's web developers is highly recommended to ensure custom scripts and formatting are correctly converted and migrated.
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Frequently Asked Questions

Is there a one-click migration tool for moving an internal website to SharePoint?

No, there is typically no single-click solution because internal websites often possess custom architectures. Migration usually requires a combination of manual file transfers, HTML to ASPX conversion, and API integrations.

Can I host standard HTML pages directly on SharePoint Online?

SharePoint Online primarily relies on ASPX pages to render sites correctly. While you can store standard HTML files in a document library as regular files, displaying them seamlessly as active web pages usually requires converting them to ASPX.

How do I rebuild unsupported website functionality in SharePoint?

Unsupported legacy features can typically be rebuilt using native Microsoft 365 tools, such as Power Automate for complex workflows, Power Apps for custom forms, and custom API connectors to integrate with external data sources.