Send any files to anyone.
Privately.
AlterSend sends files straight between devices, end-to-end encrypted — never through cloud storage. No accounts, no size limits, no codes to scan once you've paired.
Three steps.
That's it.
Pair devices
Scan a QR code or paste a join code — no accounts, no sign-up. Pair devices you own once and they're remembered, so future transfers skip the code.
Encrypted channel opens
Your devices find each other on the peer-to-peer network and open an end-to-end encrypted channel.
Files transfer
Drop files in. They travel device-to-device, end-to-end encrypted, without touching cloud storage.
Others get close.
None go all the way.
Every tool people actually use has at least one dealbreaker. AlterSend was built to have none.
Built for transfers.
Not uploads.
Direct, peer-to-peer
Your files never touch cloud storage — there is none. End-to-end encrypted with ChaCha20-Poly1305.
- End-to-end encrypted
- Files never touch cloud storage
- New encryption keys per session
No size limits
1 KB or 200 GB — same flow. You're not uploading, you're transferring.
No accounts
Open. Pair. Send. Nothing to sign up for, nothing to leak.
Cross-platform
Mac, Windows, Linux, iOS, Android — one shared protocol.
Pair once, skip the code
Pair the devices you own a single time. After that, transfers between them go straight through — no QR, no join code. Only a public device key is stored; the secret stays in your OS keychain.