Krypt Cards
Create & Share Secure, End-to-End Encrypted Digital Business Cards
Your data is yours. No accounts, no tracking, just cryptography.
Private by Design
Your card data is encrypted in your browser. We can't read it, ever. Zero-knowledge architecture means your privacy is mathematically guaranteed.
You're in Control
Update or delete your card anytime with your unique Owner Key. No accounts needed - just cryptographic ownership using Ed25519 signatures.
Share Instantly
Share your card with a QR code or link. Recipients don't need an app or account. Works on any device with a web browser.
How It Works
Create Your Card: Fill in your business information. Everything stays in your browser.
Secure Your Data: Your card is encrypted with AES-256-GCM and signed with Ed25519.
Save Your Keys: Download your Owner Bundle to update or delete your card later.
Share Freely: Send your card link or QR code to anyone. The decryption key is in the URL fragment (never sent to servers).
Best-in-Class Cryptography
• Encryption: AES-256-GCM with PBKDF2 (310,000 iterations per OWASP 2024)
• Signatures: Ed25519 for cryptographic proof of ownership
• Architecture: Zero-knowledge - we never see your plaintext data
• Open Source: Our code is transparent and auditable
No sign-up required • Free forever • Your data stays yours