End-to-end encrypted fax exchange.
fxe is a relay for organizations that move documents over fax. Files are encrypted on the sender's device and only decryptable by the recipient. The relay never sees plaintext, never holds your private keys, and discards ciphertext as soon as it's been delivered.
Server-blind
The relay stores opaque ciphertext and signed metadata. It has no key that can decrypt anything it stores — not even briefly.
Hybrid post-quantum
Each message is wrapped with both ML-KEM-768 and X25519. An attacker would need to break both to recover a key — today's classical math plus a future quantum computer.
Receipts & sweep
Recipients sign a receipt when they pick up a message. The relay verifies the signature and then deletes the ciphertext. Undelivered messages sweep on a TTL.
No per-minute carrier charges
Traditional fax rides PSTN, where carriers bill by the minute. fxe moves documents over IP between member orgs — no meter running, and a 50-page PDF travels as fast as your network does.
Sends to numbers not on fxe still need a PSTN fallback.
Color & high-res for free
Send full-color, high-DPI PDFs without premium tariffs or quality loss. Traditional fax compresses to monochrome and surcharges color; fxe carries the PDF exactly as you uploaded it.
Network effects
Every org that joins expands what every other member can do. Lanes that used to fall back to PSTN start routing through fxe instead — instant, free, and encrypted. The more high-volume partners on the exchange, the more your costs drop.
Got an invite token?
Generate keys in your browser and redeem in one step.