Free Client-Side File Encryption
Zero Server Uploads

While tools like VeraCrypt provide excellent full-disk encryption, they require system installation and technical expertise. AxCrypt and Cryptomator are powerful for cloud syncing, but they often require dedicated app downloads or premium subscriptions to unlock full features. UniDoc gives you the same AES-256 military-grade protection but is entirely browser-based, instantly accessible, 100% free, and requires absolutely zero installations.

Yes, you can securely encrypt PDFs, Word documents, images, and ZIP archives. Because processing happens locally in your browser, your files remain completely private and are never uploaded to a cloud server.

There are no artificial file size limits imposed by UniDoc. However, because the encryption happens entirely within your browser's memory, the maximum file size you can process successfully depends on your device's available RAM and browser limits.

Absolutely not. We have zero server-side processing for your files. Everything happens locally using your browser's built-in cryptographic engine. We cannot see your files, your passwords, or your encrypted output. There is no database, no cloud storage, and no logging of your activity.

Unfortunately, if you lose your password, your file is permanently unrecoverable. We do not store passwords, maintain backdoors, or offer any recovery mechanism. This is the trade-off of true zero-knowledge encryption: only you hold the key. We strongly recommend storing your password in a reputable password manager or writing it down in a secure physical location.

Asymmetric encryption uses a public-private key pair to secure data. RSA and Elliptic Curve Cryptography (ECC) are common examples. Unlike symmetric methods that use one key, asymmetric systems encrypt with a public key and decrypt with a private key. UniDoc uses AES-256-GCM (symmetric) for file encryption because it is significantly faster for large files, while still providing military-grade security.

Yes. UniDoc is a tool with key derivation built in. Your password acts as the key, and our system uses PBKDF2-SHA256 with over 150,000 iterations to transform it into a hardened 256-bit encryption key. You can also generate and share secure keys with optional expiration for additional control.

When you share files online—whether via email, cloud storage, or messaging apps—they pass through multiple servers and networks. Without encryption, anyone with access to those systems (hackers, service providers, or government agencies) can read your data. Encryption ensures that even if the file is intercepted, stolen, or subpoenaed, it remains completely unreadable without the password. It is the only way to maintain true confidentiality in an interconnected world.

Yes. AES-256 is currently unbreakable by any known practical means. It is approved by the NSA for securing top-secret information and is the global standard for protecting sensitive data. To put it in perspective, a brute-force attack on AES-256 would require more energy than the sun produces in a year, making it mathematically infeasible to crack. Combined with our 150,000+ iteration PBKDF2 key derivation, your data is protected against even the most sophisticated attackers.

Yes, UniDoc Encrypt is completely free to use and exceptionally safe. Because it runs entirely in your browser, there is no installation required, no malware risk, and no hidden costs. We do not collect personal information, display intrusive advertisements, or monetize your data. The tool is designed with transparency and user privacy as its core principles, making it one of the safest encryption solutions available online.