Zero-Knowledge · Zero-Tracking · Client-Side Vaults

Encrypt Anything. Expose Nothing. Private Folder Vaults Running 100% In-Browser.

Military-grade AES-256-GCM encryption with PBKDF2-SHA512. Your files, keys, and passwords never leave your device.

AES-256-GCM
600,000 PBKDF2 Iterations
100% Air-Gapped & Offline
ENCRYPT

Encrypt Folder

Compress & encrypt an entire folder into a single portable vault file.

📁

Drop files or folder here

or

No folder or files selected

Keyfile (Optional Second Factor)

Any file acts as a physical key. Without it, the vault cannot be unlocked.

⚠️

If you lose the password or required keyfile, files may be permanently inaccessible.

DECRYPT

Decrypt Folder

Restore your original folder from a .zev vault file with your password.

📦

Drop .zev file here

or

No file selected

Keyfile (for v2 vaults only)

If this vault requires a keyfile, select it here. Standard vaults auto-detect.

🛡️

Auto-detects format. AES-GCM authenticates and checks for tampering.

Why Choose ZevSafe for Offline Folder Encryption?

Zero-knowledge client-side encryption engineered for privacy, speed, and cross-platform portability.

100% Client-Side & Zero-Knowledge

All encryption and decryption runs entirely in your browser using the native Web Crypto API. Files, passwords, and keys never leave your device.

AES-256-GCM Military-Grade Cipher

Authenticated Galois/Counter Mode encryption automatically verifies data integrity and prevents tampering, bit-flipping, and corruption.

PBKDF2-SHA512 (600,000 Iterations)

Strengthened key stretching with a 32-byte CSPRNG random salt provides robust resistance against GPU/ASIC brute-force and dictionary attacks.

Keyfile Two-Factor Authentication

Enhance security by combining your password with any personal file (image, document, key) as an indispensable second factor.

Full Folder Tree Compression

Smart adaptive packaging compresses text files while using instant STORE mode for pre-compressed videos and photos, maximizing performance.

Air-Gapped & 100% Offline PWA

Install as a Progressive Web App and operate in complete airplane mode. No network connection or account sign-up is ever needed.

Frequently Asked Questions

Everything you need to know about browser-based zero-knowledge folder protection.

How does ZevSafe encrypt folders without uploading them?
ZevSafe runs 100% inside your browser using the native W3C Web Crypto API. Folders are packaged into an in-memory zip archive, an AES-256-GCM encryption key is derived using PBKDF2-SHA512 (600,000 iterations), and the ciphertext is downloaded directly to your disk. No data is ever transmitted over the network.
Is ZevSafe safe to use offline and air-gapped?
Yes. ZevSafe is a Progressive Web App (PWA) with full offline caching. You can disconnect your Wi-Fi, unplug Ethernet, or use airplane mode. Your files and passwords remain strictly in device RAM.
What encryption standard does ZevSafe use?
ZevSafe employs military-grade AES-256-GCM (Galois/Counter Mode) authenticated encryption, PBKDF2-SHA512 key derivation with 600,000 rounds, a 32-byte cryptographically secure random salt, and an optional physical keyfile second factor.
What is the maximum folder size I can encrypt?
On desktop browsers, ZevSafe can process folders and videos up to 5 GB+ with zero-copy stream architecture. On mobile devices, files up to 2.5 GB are supported. For 25 GB to 100 GB+ datasets, download our 1-click Windows PC Setup toolkit from the navigation bar.
Is there a dedicated mobile app for Android?
Yes! In addition to this offline PWA, we provide a dedicated native Android application (download APK). The Android app features full background encryption via Android Foreground Services, native ExoPlayer Cinema media streaming, and system share sheet integration, all running 100% offline with zero knowledge.

Looking for step-by-step instructions and technical architecture? Visit our Comprehensive User Guide & Documentation.