What is a PROTONDOC file? A PROTONDOC file is a document created by Proton Docs, an online word processor included with Proton Drive. It stores a text document in an encrypted container format that users can edit and collaborate on within Proton Docs. PROTONDOC files are stored directly in a user's Proton Drive account, and the user will likely never see the .protondoc file extension.

More Information PROTONDOC file open in Proton Drive Proton Docs is a web-based document editor integrated into Proton Drive that allows users to create, edit, and collaborate on text documents with end-to-end encryption. Proton Drive is Proton's encrypted cloud storage service, designed to protect files and documents from unauthorized access while enabling private sharing and syncing across devices. When you create a new document in Proton Drive using the built-in Proton Docs editor, the app saves it as a PROTONDOC file. If you open an existing text-based file, such as a .DOCX or .TXT , in Proton Docs, the app generates a new PROTONDOC version for editing within the encrypted environment.