Welcome to Pantheon! We want to make it easy for you to move a site from another hosting provider to Pantheon. Use the following instructions and you'll be good to go!
If your migration needs include any of the following, do not use this process, and instead refer to the specified documentation:
The site or site archive is greater than 500MB: Manually Migrate Sites to Pantheon
You are migrating a site that is only on your local machine: Manually Migrate Sites to Pantheon
You are using Drupal version 9 or higher, or are moving a Drupal site and want to upgrade to the latest version of Drupal:
Your site is Composer-managed: Migrate a Composer Managed Drupal Site from Another Platform or Import Drush Site Archives with Terminus
Your site is not Composer-managed: Migrate a Drupal Site from Another Platform
Pantheon's Professional Services team can migrate your site for you. Learn more about our Website Migration Service and how we can help you migrate one or hundreds of sites to Pantheon.