Encrypt Decrypt Dashboard
verified_user Military-Grade Encryption

Encrypt Your Files
In Your Browser

Protect any file with AES-256-GCM encryption directly in your browser. No uploads. No servers. Your data never leaves your device.

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AES-256 Encryption
GCM Auth Mode
150K+ PBKDF2 Rounds
0 Data Sent
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Encrypt File

Select a file, set a strong password, and encrypt it securely with AES-256-GCM

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Drop your file here

or click to browse

Any file type • Max 100MB • Processed locally
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Decrypt File

Open .ufenc files encrypted by UniDoc — either from the app or this website

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Drop your .ufenc file here

or click to browse

Only .ufenc files • Processed locally
info

About UniDoc Encrypt

Military-grade security made simple and accessible

UniDoc Encrypt is a cutting-edge browser-based encryption tool and free encryption software designed to protect your sensitive files without ever uploading them to a server. Using the advanced AES-256-GCM encryption algorithm, we ensure that your data remains completely private and secure when you need encryption online aes protection.

Unlike cloud-based solutions that require you to trust third-party servers with your unencrypted data, UniDoc performs all cryptographic operations directly within your browser using the Web Crypto API. This means your files, passwords, and keys never leave your device, giving you a true encryption online tool with key privacy. If you need to encrypt and decrypt online with confidence, this client-side approach guarantees your data stays under your control.

Whether you're protecting personal documents, financial records, or confidential business files, UniDoc Encrypt provides the same level of security used by governments and financial institutions worldwide—completely free and with zero trade-offs on privacy. It is the ideal password encryption online solution for users who demand total confidentiality.

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Free encryption software interface for online file encryption with AES-256

How It Works

Three simple steps to protect your files

1

Select Your File

Choose any file up to 100MB. Documents, images, videos — anything you want to protect.

2

Set a Password

Use a strong password (12+ characters) or let us auto-generate a cryptographically secure one for you.

3

Download Encrypted

Get your .ufenc encrypted file. Decrypt it anytime on this site or in the UniDoc app with your password. Start with online file encryption for free today.

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Encryption Process Explained

A visual breakdown of how your data stays secure from start to finish

1
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Password + Salt

Your password is combined with a unique 128-bit salt. This prevents attackers from using pre-computed rainbow tables against your file.

2
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PBKDF2 Key Derivation

The salt and password are hashed through 150,000+ iterations of PBKDF2-SHA256, producing a hardened 256-bit encryption key.

3
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AES-256-GCM

Your file is encrypted with AES-256 in Galois/Counter Mode, a reliable encryption online aes standard. An authentication tag guarantees the data hasn't been altered.

4
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.ufenc Package

The salt, iteration count, IV, ciphertext, and auth tag are packaged into a single .ufenc file ready for secure storage or sharing.

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Security Features

Enterprise-grade encryption, available to everyone

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AES-256-GCM

Military-grade authenticated encryption. The same standard used by governments and financial institutions worldwide.

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PBKDF2-SHA256

150,000+ iterations of key derivation. Makes brute-force attacks computationally infeasible even with powerful hardware.

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100% Client-Side

Everything happens in your browser. No file is ever uploaded to any server. Zero-knowledge architecture.

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Integrity Verification

GCM authentication tag and SHA-256 hash ensure your files haven't been tampered with during storage or transit.

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Secure Key Sharing

Generate one-time key shares with expiration. Share keys separately from encrypted files for maximum security.

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App Compatible

Files encrypted here use the exact same .ufenc format as the UniDoc app. Encrypt on web, decrypt on mobile — and vice versa.

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Our Privacy Promise

Your data belongs to you, and only you

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No Data Collection

We do not log, store, or transmit your files or passwords. Everything is processed locally within your browser using JavaScript and the Web Crypto API.

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Zero Server Uploads

Your files never touch our servers. There is no cloud processing, no backup, and no hidden data transfer. What happens in your browser stays in your browser.

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No Account Required

We don't ask for your email, phone number, or any personal information. Use the tool instantly without creating an account or accepting tracking cookies.

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Zero-Knowledge Architecture

We architected this tool so that even if our infrastructure were compromised, there is nothing to steal—because we never possess your unencrypted data or keys.

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Where to Use This Software

Protection designed for every scenario

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Corporate Environment

Secure financial reports, legal contracts, and confidential memos before sharing them internally or with external partners.

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Education & Research

Protect student records, research data, and unpublished academic work from unauthorized access or data breaches.

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Healthcare & Legal

Encrypt patient records, case files, and sensitive client documents to comply with privacy regulations like HIPAA and GDPR.

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Cloud Storage Safety

Encrypt files before uploading them to Google Drive, Dropbox, or OneDrive. Even if the cloud is breached, your data remains unreadable.

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Email Attachments

Send encrypted files via email with confidence. Even if intercepted, the contents are completely protected without the password.

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Personal Archives

Protect family photos, personal documents, password backups, and digital wills on your local drives or USB sticks.

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Frequently Asked Questions

Everything you need to know about UniDoc Encrypt

UniDoc Encrypt uses the Web Crypto API built into modern browsers. When you drop a file, our client-side JavaScript reads it locally, derives a 256-bit key from your password using PBKDF2-SHA256 with 150,000+ iterations, and encrypts the data using AES-256-GCM. The output is a .ufenc file containing the salt, IV, ciphertext, and authentication tag. All of this happens inside your browser—no data ever leaves your device.

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 online 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 an encryption online 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.

Feature AES PGP RSA
Type Symmetric Hybrid (Both) Asymmetric
Key Usage Single shared key Session + public key Public/Private pair
Speed Very Fast Moderate Slow
Best For Securing files & data Email & messaging Key exchange & signatures
Key Size 128, 192, 256 bits Up to 4096 bits 2048 - 4096 bits
Used By UniDoc Yes (AES-256-GCM) No No

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.

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Sources & References

Authoritative sources that back our security claims and methodology

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code Technical & Open Source

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Encrypt on Web. Decrypt on Mobile.

The same .ufenc format works everywhere. Encrypt a file here and open it in the UniDoc app — or encrypt on your phone and decrypt here. Complete cross-platform compatibility.

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