Zero-Knowledge Encryption & Burn-After-Reading, Built Right.
Every feature in Wispr exists to make one guarantee stronger: that what you share actually disappears — and that we never see it in the first place.
Core Capabilities
Everything you need. Nothing you don't.
Zero-Knowledge Encryption
Your message or file is encrypted with AES-256-GCM inside your browser before anything is sent over the network. The key never touches our servers — we store ciphertext we structurally cannot read.
Burn After Reading
Enable burn-after-reading and the secret is permanently deleted from our database the instant it's revealed. Not a flag, not a soft delete — a hard DELETE before the response is even sent.
Expiry Windows
Set a secret to self-destruct after 1 hour, 24 hours, 7 days, or 30 days — regardless of whether it was ever viewed. Expired secrets are wiped the next time anyone tries to access them.
Max View Count
Need to share one secret with a small group instead of one person? Set a maximum number of views. Once the limit is hit, the secret is destroyed automatically, no matter who's asking.
Password Protection
Add an extra layer with a password. PBKDF2 derives a wrapping key from it entirely in your browser, and the master key is wrapped with AES-KW before upload. Your password never leaves your device.
Encrypted File Sharing
Share files, not just text. Files are encrypted client-side exactly like messages, then offered to the recipient as a browser download after they decrypt it locally — never stored in plaintext.
See how it all fits together.