custam master page form on premisis to online

sns 9,226 Reputation points

how to migrate custom master page form on premisis to online , best way to migrated custom master page( site master page)
Please suggest. We are using SMPT tool, and can u give me high level steps

SharePoint Development
SharePoint Development
SharePoint: A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.Development: The process of researching, productizing, and refining new or existing technologies.
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  1. CaseyYang-MSFT 10,326 Reputation points

    Hi @sns ,

    Per my research, Custom master page files (*.master) shouldn't be migrated to the new platform. The setting on the destination site will be set to the default master page. This process ensures the site will render after the migration. If you decide to continue using the customized master page on the new platform, you will need to apply the master page setting and validate your customizations work on the new platform.

    For Reference: Migration Assessment Scan: Master Pages

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