Secure note
Write a note, lock it with a password, and share the link. The note is encrypted in your browser (AES-256) and stored only inside the link itself. Share the password through a different channel.
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This note is locked
There is no password recovery, and anyone with both the link and the password can read the note. The link works for as long as it exists, and can't be revoked. For longer-term secrets, use a password manager.