Encrypt Anything.
Quantum-Ready.
Encrypt locally. Download securely. Leave no server trace and no digital online signatures. No Third-Party Analytics. No External Tracking.
Decrypt only with your passphrase. Military-grade AES-256-GCM encryption — entirely in your browser also while offline.
How It Works
Four steps. Zero servers. Complete privacy.
Upload File or Folder
Drag and drop any file type — documents, images, videos, archives — or entire folders. All processing happens instantly in your browser.
Enter Your Passphrase
Choose a strong passphrase — or let us generate one for you. We never transmit, store, or have any access to your passphrase. Ever.
Quantum-Resistant Encryption
We derive a 256-bit key using PBKDF2 (310,000 iterations) and encrypt with AES-256-GCM — entirely client-side. Your passphrase and key are erased immediately after.
Download & Decrypt Anytime
Your encrypted file is downloaded instantly. To decrypt later, simply upload the .enc file and enter the same passphrase — on any device, any browser.
CryptShield Encryptor
Military-grade encryption in your browser — zero data leaves your device
Drop files or folder here
Supports any file type — documents, images, video, archives
🔐 Your passphrase and derived key are immediately erased after every operation. No data is ever transmitted to any server.
Clears all session memory, object URLs, and sensitive variables from this browser session. After clearing, close the tab for maximum security.
Text Encryptor
Encrypt any message — share it as encrypted text or as a QR code
🔐 AES-256-GCM text encryption — everything happens in your browser, nothing is sent anywhere.
Clears all session memory, object URLs, and sensitive variables from this browser session. After clearing, close the tab for maximum security.
Built for the Post-Quantum Era
AES-256-GCM combined with PBKDF2 (310,000 iterations) is considered quantum-resistant because symmetric encryption only suffers a quadratic speedup from Grover's algorithm — effectively reducing 256-bit security to 128-bit, which remains computationally infeasible to break.
Why Quantum-Resistant?
Shor's algorithm threatens asymmetric cryptography (RSA, ECC) by factoring large integers in polynomial time. CryptShield uses symmetric-only encryption, which is immune to Shor's algorithm.
Grover's algorithm can search symmetric key spaces quadratically faster — reducing 256-bit AES to ~128-bit effective security. 128-bit security requires 2¹²⁸ operations — a number so astronomically large that no quantum computer imaginable today or in the foreseeable future could crack it.
NIST's post-quantum recommendations affirm that AES-256 is sufficient for quantum-resistant symmetric encryption.
Security Guarantees
- 🛡️100% client-side — code runs in your browser, not on a server
- 🔑Passphrase & derived key securely erased after each operation
- 🌐No servers, no cloud storage, no network requests
- 📖Open-source ready — fully auditable cryptography
- 🔒GCM provides authenticated encryption: wrong passphrase = decryption fails
- ⚛️Quantum-resistant: symmetric encryption only requires doubling key size against Grover's algorithm
Local-Only Browser Encryption
All cryptographic operations happen exclusively inside your browser. No file data, no passphrase, no metadata — nothing is transmitted to any server. The website itself is a static interface that runs entirely on your device.
Passphrase-Based Key Derivation
Your passphrase is transformed into a 256-bit encryption key using a memory-hard key derivation function. The key is derived fresh every time and is never stored or transmitted anywhere.
No Server-Side File Handling
There is no backend storage, no cloud upload, no database. Encrypted files exist only on your device. No account is required. No metadata is collected. No logs are written.
Argon2id Memory-Hard KDF
Argon2id uses 256 MB of RAM during key derivation (adaptive to device memory). This extreme memory requirement makes brute-force attacks computationally infeasible, even with specialized hardware.
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Frequently Asked Questions
Everything you need to know about CryptShield