How do I use this tool?

Simply start using the tool. No registration required, everything works in your browser.

No, all data stays locally on your device. We do not store or track any personal information.

Does it work offline?

Yes, once the page loads, the tool works completely offline.

Encrypt messages and files. Lock them until the future.

Share this unique tool:

Capsule Title

Message

Files (Optional)

Click to upload files (max 10MB per file)

Unlock Date & Time

Encryption Password(optional: use xenpass.com to create military-strong passwords)

Self-destruct after opening (one-time access)

Your time capsule will be encrypted with AES-256-GCM and downloaded as a .xtc file. Keep this file and password safe. No data is sent to any server.