Secure File Drop: A Private Alternative to WeTransfer

WeTransfer, Google Drive, and most mainstream file transfer tools receive your files in plaintext. Their servers store readable copies. Terms of service often grant broad rights to scan content for malware, legal compliance, or advertising. A data breach, legal subpoena, or rogue employee exposes everything you have ever uploaded. If you still wonder whether email attachments are safer, compare this with the common cases where email is the wrong channel for sensitive data.

The people most affected are those who work with sensitive documents by definition: lawyers sending contract drafts, HR teams sharing compensation data, IT teams distributing SSH keys or certificates, medical practitioners sending diagnostic images, and finance teams exchanging signed documents. For a business-focused view on those use cases, see also why secure sharing is a competitive advantage for professional services firms.

Secure file drop on mboxly.app works differently. Files are encrypted in your browser using AES-256-GCM before a single byte is transmitted. The decryption key is embedded in the URL fragment — the part after the # symbol that browsers never send to servers. The server receives and stores only ciphertext. It cannot read your files, and neither can anyone who gains access to the server. If you want the technical detail behind that mechanism, read how the URL fragment keeps the decryption key off the server.

This distinction matters operationally. In a conventional file-sharing service, the provider must protect both the storage layer and the access controls around readable content. In a zero-knowledge design, the storage layer still matters, but a storage breach yields encrypted blobs rather than documents an attacker can open immediately. That does not remove all risk, but it substantially changes the severity of the incident.

When the link expires or is opened once with burn-after-reading, the encrypted file is deleted. No readable copy ever existed on the server. No deletion is necessary on your end because there was nothing sensitive there to begin with.