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Local File Encryption
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Local File Encryption

Password-encrypt whole files with AES-256 in your browser and export them as .uv encrypted files — nothing is uploaded, no key is stored.

Works Offline100% Free

Processed 100% locally in your browserPrivate & Safe

Local File Encryption runs entirely on your device using Web API standards. No data is ever uploaded to UtilixVerse servers.

Your Input
➔
Browser
➔
Result
No Server UploadsNo Account RequiredWorks OfflineZero Data Logging

Encrypt a File

Drop a file here or click to browse

Any file type, any size — streamed and encrypted locally with AES-256-GCM.

Key derived via PBKDF2-SHA-256 (600,000 iterations). The password never leaves this page.

Select a file and a password to encrypt it locally.

Free Local File Encryption — AES-256-GCM in Your Browser

Welcome to the UtilixVerse Local File Encryption tool — a free, private way to lock any file (documents, PDFs, archives, photos, spreadsheets) with AES-256-GCM encryption. Select a file, choose a strong password, and download a .enc envelope you can safely email, upload to cloud storage, or put on a USB stick. Everything runs 100% in your browser via the Web Crypto API — no servers, no uploads.

Secure by Construction

Your password is hardened with PBKDF2-HMAC-SHA256 at 600,000 iterations with a random 128-bit salt, then the file is sealed with AES-256-GCM and a fresh 96-bit IV. The output is an authenticated envelope: tampering or corruption is detected on decryption rather than silently producing garbage.

Why Encrypt Files Locally

Cloud drives, email attachments, and file-sharing links can all be intercepted or subpoenaed. Locally encrypted files are unreadable without the password, even if the storage provider itself is compromised. Because the browser does all the cryptography, your plaintext never crosses the network — stronger than any "zero-knowledge" service that still routes your data through its own servers.

Works Offline & Everywhere

No install, no sign-up, no size limits beyond what your browser can hold in memory. The encrypted file is opened by the companion Local File Decryption tool on any device, in any browser — all you need is the password.

Frequently Asked Questions About Local File Encryption

What does the encrypted .enc file look like?

The output is a binary file that begins with the "UVE1" magic bytes, followed by a version byte, a 128-bit random salt, a 96-bit IV, and the AES-256-GCM ciphertext (which includes the authentication tag). It is self-describing, so the companion decryption tool can validate it and restore the original filename. Nothing about the original content or filename is readable from the encrypted file.

Is AES-256-GCM secure enough for files?

Yes. AES-256-GCM is the cipher NIST recommends for data at rest and is used across banking, government, and cloud infrastructure. GCM is an authenticated mode, meaning the decryption tool detects any tampering or corruption instead of silently producing wrong output. Combined with PBKDF2-SHA-256 key derivation at 600,000 iterations, brute-forcing the password is computationally infeasible for strong passphrases.

How is the encryption key derived from my password?

The password is never used as the key directly. It is stretched with PBKDF2-HMAC-SHA256 over 600,000 iterations plus a fresh random 128-bit salt, producing a 256-bit AES key. This makes each password guess expensive for an attacker and defeats precomputed rainbow tables.

Is my file uploaded anywhere?

No. The file is read into memory with the browser File API, encrypted locally with the Web Crypto API, and the encrypted result is handed back to you as a download. There is no server involved, nothing is uploaded, and the tool works offline after the page loads.

What happens if I forget the password?

The file is unrecoverable. There is no backdoor or recovery mechanism by design. Store the password in a password manager, and test a round trip (encrypt then decrypt a small file) before protecting anything you cannot afford to lose.

How do I decrypt the file later?

Open the Local File Decryption tool on this site, select the .enc file, enter the same password, and download the decrypted original. The tool reads the embedded salt and IV from the envelope and derives the identical key, so it works with any password manager you use to store the passphrase.

Is this file encryption tool free and private?

Yes — completely free, no registration, and fully private. All encryption runs in your browser with hardware-accelerated Web Crypto; nothing is sent to any server, and there are no usage limits or account requirements.

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