How ZapFile Works
ZapFile uses encrypted cloud storage to transfer files directly from sender to recipient — with zero permanent storage, no accounts, and complete privacy. Here's the technical breakdown.
The Simple Version
Think of ZapFile as a secure digital courier. Your file travels from your device to encrypted cloud storage, stays there just long enough for your recipient to download it, then vanishes forever. Our servers only facilitate the introduction — they never touch or store your files.
Transfer Flow
Files are deleted from encrypted storage once download completes
Technical Architecture
Encrypted Cloud Storage Layer
ZapFile uses distributed cloud storage with built-in encryption at rest. Files are uploaded to encrypted storage using TLS 1.3, encrypted during storage using AES-256, and downloaded by the recipient through the same secure channels. Our servers only manage transfer coordination (generating room codes, tracking transfer status) — they never process or store your actual files.
Zero-Persistence Storage
Files exist in encrypted storage only during the active transfer. Once the recipient successfully downloads the file, it is automatically and irrevocably deleted from storage. This ensures no file persists beyond its intended purpose. The transfer link also becomes invalid after completion, preventing unauthorized access.
Room Code System
When you initiate a transfer, ZapFile generates a cryptographically secure, random room code. This code serves as the unique identifier for your transfer session. Share this code (or the pre-generated link containing it) with your recipient through any channel — text, email, chat, or social media. Room codes are single-use and expire after the transfer completes.
Chunked Transfer Protocol
Large files are automatically divided into chunks for reliable transfer. This chunking provides multiple benefits: improved error recovery (failed chunks can be retried without restarting the entire transfer), parallel transfer capability (multiple chunks upload and download simultaneously), and better progress tracking. The recipient's browser reassembles the chunks into the original file seamlessly.
Security & Encryption
In-Transit Encryption
All uploads and downloads use TLS 1.3, the latest version of the Transport Layer Security protocol. This provides strong encryption for data in transit between devices and cloud storage.
At-Rest Encryption
Files stored temporarily are encrypted using AES-256, the U.S. government standard for protecting sensitive information. Each file uses unique encryption keys managed by the cloud infrastructure.
Server Separation
Our application servers (which handle room codes and transfer coordination) are architecturally separated from the storage layer. Our servers never process, store, or have access to your file contents.
No Persistent Data
Since files are deleted after download, there is no data to breach. Zero retention means zero exposure. See our Privacy Policyfor complete details on our minimal data practices.
Step-by-Step Transfer Process
Select your files
Drag and drop files or folders into your browser, or tap Browse to select from your device. ZapFile supports any file type and any size — from small documents to multi-gigabyte video files.
Generate secure link
ZapFile generates a cryptographically random room code and creates a unique, secure transfer link. This link is all you need to share — no passwords, no accounts required.
Share with recipient
Send the transfer link to your recipient through any channel: text message, email, chat app, social media, or any messaging platform. The link works on any device and any browser.
Recipient downloads
Your recipient clicks the link, and their browser downloads the file directly from encrypted storage. No sign-up, no software installation, no waiting for permissions.
Automatic deletion
Once the download completes successfully, the file is automatically deleted from encrypted storage. The transfer link becomes invalid, ensuring no one can access the file afterward.
Important Considerations
- Both parties must be online:Since files are not stored permanently, both sender and recipient need to be connected during the transfer. The sender should remain online until the recipient starts downloading.
- Transfer link expiration:Transfer links become invalid once the download completes. If you need to share the same file with multiple recipients, initiate a new transfer for each person.
- Connection requirements:Stable internet connection is required for both parties during transfer. Most networks work seamlessly, but some restrictive corporate firewalls may affect performance.