Proton Drive is a cloud-based storage service developed by Proton AG, offering end-to-end encryption. Users can store, synchronize, and share files securely across multiple devices. It can be accessed via web, desktop, and mobile applications. The service encrypts file content, names, and paths for comprehensive data protection. Proton Drive is open source, independently audited, and based in Switzerland, adhering to strict privacy laws. It offers secure file synchronization and sharing, with the ability to control access. The service gives up to 5 GB of free file storage but offers additional features through a paid account. Unlike other services, Proton Drive's encryption prevents the service from accessing your files. It provides automatic cross-device synchronization and easy file sharing.