Encrypt. Store. Sign.
Safe from
quantum computers.
PQCServer is a zero-knowledge platform for post-quantum encrypted messaging, secure file storage and quantum-safe document notarization. Built on NIST 2024 standards. Everything runs in your browser — the server never sees your keys or your content.
Three services.
One quantum-safe platform.
Encrypted Messaging
Send text messages and files encrypted with ML-KEM + AES-256-GCM. Share via a simple shortlink. The recipient decrypts in their browser — no app, no account required to receive. Enable burn-after-read for self-destructing messages.
Learn more →Quantum-Safe Vault
Store encrypted files permanently in your personal vault. No size limits — files are split into chunks and stored. Share files with specific users or generate shareable shortlinks. Your files are encrypted before they leave your browser.
Learn more →Document Notary
Prove a document existed at a specific moment in time. Sign with your ML-DSA key, get a server-countersigned Notary Receipt with cryptographic timestamp. Anyone can verify authenticity without downloading any software.
Learn more →Send a message in 4 steps
No installation. No plugins. Just a browser.
pqcserver.com/m/xxx anywhere — email, chat, SMS.Built for privacy by design
Zero-Knowledge Server
All cryptographic operations happen in your browser. The server stores only ciphertext it mathematically cannot decrypt. By design, not policy.
NIST 2024 Standards
ML-KEM (FIPS-203) for encryption and ML-DSA (FIPS-204) for signatures — the same algorithms adopted by Google, Cloudflare and the US federal government.
Universal Shortlinks
Every message gets a shortlink. Paste it in Gmail, WhatsApp, Slack, SMS. Recipients need no account to decrypt — just their private key.
Burn After Read
Messages are permanently deleted the moment the recipient opens them. Nothing lingers on our servers beyond what you allow.
No File Size Limits
Files are split into 3MB encrypted chunks and stored in MongoDB GridFS. Upload gigabytes — no single request ever approaches Cloudflare limits.
Embeddable Widget
Add one line of code to any website. Opens an inline modal with the full encryption flow — no redirect, no new tab. Ideal for contact forms, intake flows and whistleblowing pages.
Quantum-Safe Notary
Document hash + ML-DSA signature + server timestamp = a Notary Receipt. The document never leaves your browser. Anyone can verify authenticity with the receipt ID.
Public Profiles
Register a username. Share pqcserver.com/u/you — anyone can send you encrypted messages without knowing your key.
REST API
Integrate PQCServer into your own applications. Upload files, send messages and verify notary receipts programmatically without building the cryptography yourself.
The threat is happening now — not in the future
State actors are intercepting and storing encrypted communications today, waiting for quantum computers powerful enough to decrypt them. This attack — called "Harvest Now, Decrypt Later" — means data encrypted with RSA or ECC right now is already at risk. PQCServer uses ML-KEM and ML-DSA — NIST-standardized algorithms designed to resist both classical and quantum computers.
Start encrypting with post-quantum security
Free. No credit card. Ready in 60 seconds. Your keys never leave your browser.