Zero-Knowledge In-Browser AES-256-GCM File Encryption & Decryption Studio
Encrypt and decrypt confidential documents, archives, and media directly in your browser using military-grade AES-256-GCM authenticated cryptography. Features PBKDF2 key derivation with 600,000 SHA-256 iterations and zero cloud exposure.Documentation & FAQs ↓
Client-Side AES-GCM-256 File Encryption Studio
Military-grade WebCrypto file encryption with PBKDF2 (100,000 iterations) and authenticated tamper-proofing.
All cryptographic derivations utilize crypto.subtle inside an isolated sandbox. Keys are never cached or written to local storage.
Step-by-Step Instructions
4 Steps to CompletionSelect 'Encrypt' or 'Decrypt' mode and drag your file into the secure browser vault area.
Enter a strong master passphrase (or generate a high-entropy random password with the built-in generator).
Click 'Encrypt File'; the Web Crypto API derives the key, generates a fresh initialization vector, and encrypts the binary payload.
Download the resulting authenticated .enc container file, or provide the original password to restore the decrypted file.
Practical Use Cases & Real-World Scenarios
Military-Grade AES-256-GCM Authenticated Cipher
Utilizes Galois/Counter Mode (GCM) providing both confidential block encryption and cryptographic integrity verification to detect ciphertext tampering.
Hardened PBKDF2 Key Derivation
Derives 256-bit cryptographic keys using PBKDF2-HMAC-SHA256 with 600,000 iterations (OWASP recommended) and a cryptographically secure 128-bit random salt.
Native Web Crypto API Acceleration
Executes cryptographic primitives via browser-level C++ hardware acceleration (window.crypto.subtle) for gigabit-per-second encryption throughput.
Self-Contained Encrypted Container Format
Packages the 16-byte random salt, 12-byte initialization vector (IV), 16-byte authentication tag, and ciphertext into a portable standalone .enc file.
Frequently Asked Questions
Can your servers see my files, passwords, or decrypted data?↓
What happens if someone modifies even one byte of an AES-GCM encrypted file?↓
Why is AES-GCM preferred over older AES-CBC mode?↓
Why does the tool use 600,000 PBKDF2 iterations?↓
Can I recover my file if I forget the master password?↓
15 Best Encryption Software to Encrypt Data in 2026
Dive deeper into the foundational technical concepts behind this tool on our editorial blog. Includes comprehensive hardware benchmarks, case studies, and best practices.
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100% free, private in-browser utility with zero server uploads.