Wallet-to-wallet real-time chat, calls & files with sub-second handshakes and resilient relay coverage.
Built for Web3 with zero-knowledge privacy and decentralized architecture
No central servers
Client-side encryption
Chain-agnostic authentication
Encryption processing
Build, store and transact with zero-knowledge privacy and true decentralization
Built on battle-tested cryptographic libraries and modern frameworks for maximum security and performance
Run your own node, verify everything locally and participate directly in the decentralized network
Native macOS app with full-node capabilities
Windows installer with complete network participation
Universal Linux package for all distributions
Learn how zero-knowledge privacy and true decentralization work in practice
zk.im is fundamentally different because it has no central servers. Unlike WhatsApp (Meta-owned) or Telegram (server-based), zk.im uses peer-to-peer communication where messages travel directly between users' devices. This means no company can read your messages, block your account, or shut down the service. Additionally, zk.im uses zero-knowledge architecture where even metadata (who you talk to, when) is never collected.
No installation required! zk.im runs entirely in your web browser. Simply visit zk.im and connect your existing crypto wallet (like MetaMask, Phantom, or any Web3 wallet). The platform works on desktop and mobile browsers. However, for the best experience on mobile, use HTTPS (the platform automatically handles this).
zk.im uses an 'Invisible Wallet' system with guardian-based recovery. You can designate trusted guardians (friends, family, or other devices) who can help you recover access. The system uses progressive security: small transactions don't require guardians, but larger ones do. This balances convenience with security. Unlike traditional wallets, your keys are never stored—they're constructed on-demand from multiple factors (wallet signature + TOTP + optional guardian approval).
Yes, core messaging is completely free. However, some advanced features have costs: username registration (free random usernames available, or pay for custom names), file storage via Pinning service (1GB free, then pay-as-you-go), and blockchain transaction fees (paid in native tokens like ETH, SOL, etc.) for wallet operations. The platform itself doesn't charge subscription fees.
Zero-knowledge means the platform can verify message integrity and authenticity without ever seeing the content. When you send a message, it's encrypted client-side using XChaCha20-Poly1305 (256-bit keys) before leaving your device. The encryption key is derived from multiple factors using Argon2id13 (memory-hard key derivation). The platform uses BLAKE3 hashing for content addressing, which means identical files are automatically deduplicated without revealing their content.
Real-time messaging across 100+ blockchains with zero-knowledge privacy and true decentralization
Built on ZKIM P2P networking with no central servers. Messages travel directly between devices using WebRTC, ensuring privacy, security and censorship resistance.
.zkim file format for unmatched security.Real-time messaging with 2-5ms latency. FastCDC chunking enables parallel encryption for large files without compromising privacy.
Communicate with anyone across 100+ blockchains. Ethereum users message Polygon users, Solana users message Bitcoin users—all through one unified, chain-agnostic platform.
.zkim wire bytes.