Altersend.

AlterSend

AlterSend is a private, unlimited file transfer solution that enables direct device-to-device sharing without cloud storage intermediaries. Built on peer-to-peer technology with end-to-end encryption, it eliminates the common trade-offs of traditional file sharing services—no accounts required, no file size restrictions, and no ongoing code scanning for paired devices. Whether you're moving sensitive documents between work computers or sharing large media files across platforms, AlterSend keeps your data in your hands alone.

Product Highlights

• True Peer-to-Peer Architecture: Files travel directly between devices using ChaCha20-Poly1305 encryption, never touching external servers or cloud storage
• Unlimited File Sizes: Transfer anything from a single kilobyte to 200+ gigabytes without throttling, compression, or storage quotas
• Zero-Friction Onboarding: No accounts, no email verification, no passwords to remember—just open the app and start pairing
• Persistent Device Pairing: Pair devices once and they're remembered forever; subsequent transfers skip QR codes and join codes entirely
• Cross-Platform Native: Seamlessly connects Mac, Windows, Linux, iOS, and Android devices through one unified protocol
• Session-Unique Encryption: Fresh encryption keys generated for every transfer, with only public device keys stored and secrets protected in your OS keychain

Use Cases

• Secure Business Document Exchange: Transfer confidential contracts, financial records, or proprietary files between team devices without exposing data to third-party cloud providers or compliance risks
• Large Media Production Workflows: Move uncompressed video rushes, RAW photo archives, or audio project files between editing stations without upload bottlenecks or subscription storage limits
• Personal Privacy-First Sharing: Send family photos, medical documents, or sensitive personal files between your own devices or to trusted contacts with cryptographic certainty that no intermediary can access content

Target Audience

AlterSend serves privacy-conscious professionals, creative producers handling large assets, and security-minded individuals who refuse to compromise between convenience and data sovereignty—anyone who has outgrown consumer cloud services but finds enterprise tools overbearing and complex.