Email, Slack, and WhatsApp were never designed for secrets.
Passwords, API keys, private messages — once sent, they live forever.
CipherOnce fixes that.
How It Works
Simple, Technical, Honest
Encrypt in your browser
Your secret is encrypted before it leaves your device using the Web Crypto API.
Share a one-time link
We store only encrypted data. The decryption key lives only in the URL fragment — never on our servers.
Auto-destruct
After viewing (or expiration), the secret is permanently destroyed.
Why CipherOnce Is Different
True zero-knowledge
We don't know your secrets. We can't know your secrets.
Client-side encryption
No server-side decryption. No backdoors. No "trust us" claims.
One-time & expiring
Secrets burn after use — by design.
Share via link or QR
Works online or offline. Scan → decrypt → disappear.
Who It's For
Developers
- Share API keys
- Send credentials safely
- Avoid leaking secrets in chat
Founders & Teams
- Share private info with investors or partners
- Control access & expiration
- Reduce risk
Freelancers & Consultants
- Send sensitive client data
- Look professional
- Maintain privacy
Use Case Examples
"Here's the production DB password — view once."
"Scan this QR to access the confidential note."
"This message expires in 10 minutes."
Simple. Safe. Gone.
Security By Design
(Not a Feature)
No ads.
No tracking of content.
No dark patterns.
Still Early — And That's a Good Thing
CipherOnce is actively evolving.
Coming next:
Your feedback shapes what ships next.