Yes, Mass File Migrate ensures the security of your files during the migration process by leveraging Salesforce's robust security features. It adheres to Salesforce's security standards to protect your data from unauthorized access or breaches.

Mass File Migrate is a 100% app! 

Your files are not accessible to anyone outside your Salesforce org and the files are not stored in any 3rd party application which ensures that the files and data are completely safe.