Anonynote

Privnote is the original self-destructing note service (since 2008), free with optional premium features. OneTimeSecret is the developer-favorite alternative, also free with optional API access. Anonynote is functionally similar — paste text, get a shareable URL, note self-destructs after read or time. Differentiation is mostly UX and trust: Anonynote installs as a PWA so it is one tap from home screen, and it is positioned as a minimalist privacy tool. All three rely on the same architecture (E2E encryption with key in URL fragment) and are roughly equivalent in security.

Yes — Anonynote is free with no signup, no account and no premium tier. Notes are stored in encrypted form on the operator's server for a maximum of 7 days or until first read (whichever comes first). The funding model is whatever the maintainer chooses (donations or just personal project). For business-critical credential sharing where uptime matters, paid alternatives like 1Password's Send feature or Doppler's Share are stronger; for ad-hoc personal sharing, Anonynote is fine.

Notes are encrypted client-side before upload — the decryption key lives in the URL fragment (after the #), which browsers never transmit to the server. So the Anonynote server only ever holds ciphertext. This means even if the server were breached, the leaked data would be useless without the URL fragments. The remaining risk is whoever you share the URL with — once they have it they can read the note (and depending on configuration, only once). For threat models requiring true E2E with no operator trust, the architecture is solid.

The PWA installs to home screen and the UI shell loads offline. However, creating or reading a note requires a network connection to round-trip the encrypted blob through the Anonynote server (otherwise the URL has nothing to share). The encryption itself happens client-side, so your plaintext never leaves your device — but the encrypted blob still needs to be hosted somewhere for the recipient to fetch. This is intrinsic to the architecture, not a limitation of the PWA.

Anonynote-style services (Anonynote, Privnote, OneTimeSecret) are used daily by IT admins sharing temporary credentials with users, developers sharing API keys with teammates, lawyers sharing one-off case details, and ordinary users wanting to send a password to a relative without leaving it in a permanent SMS history. Enterprise teams generally prefer Bitwarden Send or 1Password Send (better SLA, audit logs); individuals and small teams default to one of the free self-destructing services.