keys on this device
Stored in this browser's IndexedDB. Private halves never leave it.
on security key derives the keypair from a YubiKey (5.2+) or other FIDO2 key with PRF; with fingerprint uses this device's own authenticator (Windows Hello, Touch ID, Android biometrics). Either way the private half is never stored — decrypting always requires the device. Security keys work on other machines by importing their ; fingerprint keys travel only if your passkeys sync (iCloud/Google).
publish to directory
Ties to your email so others can encrypt to you. A confirmation link is emailed to you first — nothing is listed until you click it. If you are signed in as that address it is published straight away.
manage your listings
Sign in to rename, expire or remove the keys published under your address — without an emailed confirmation each time. This proves you control the address and nothing more: your private keys stay in this browser and are never sent anywhere. Senders and recipients need no account at all.
listings for
Everything published under this address, including keys still awaiting confirmation. Removing a listing does not affect files already encrypted to it — those still open.
remove a listing
Takes a key out of the directory. A confirmation link is emailed to the address first. Files already encrypted to it still open.
recipients
Look up people by the email they published. Verify the fingerprint and cellprint with them out-of-band.
verified organizations
payload
drop a file or click to choose
seal & deliver
sent links
Tracked only in this browser. Counts come live from the relay.
incoming cell
⚠ This link self-destructs after one download — decrypt on the device that should keep it.
open a .cell file
drop a .cell / .celz file or click to choose
decrypted.
service
Everything here is what the service already stores to run. Blob contents are not shown because the server cannot read them, and rate-limit figures are aggregate because the client keys are salted per boot and per day — this shows pressure, never who.