About OpenKeepr
OpenKeepr is an open-source, self-hostable tool for sharing secrets one-time and securely. Messages are encrypted in your browser before they leave your device — the server cannot read them, and neither can the operator.
How it works
- Your browser generates a random 256-bit key and encrypts the message with AES-256-GCM.
- The ciphertext is uploaded; the key stays in the URL fragment (the part after #), which is never sent to the server.
- Recipients decrypt the message in their browser. Once the configured limits are reached, the ciphertext is deleted.
What we never see
- Your message content
- The decryption key
- Plaintext recipient e-mail addresses (we only store keyed hashes)