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We don’t track you and we don’t know if you’re using an adblocker. Our ads are run by Google — no pop-ups, no annoying ads, just clean placements. Ads help us keep our free tier completely free for everyone.

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How to Encrypt Files Online for Free

Encrypt any file with AES-256 directly in your browser. No upload, no account — your files never leave your device.

File encryption is essential for protecting sensitive documents before storing them in the cloud, sending them via email, or sharing on USB drives. AES-256 encryption is the gold standard used by governments and enterprises worldwide.

ConvertCraft's File Encrypt tool uses the Web Crypto API to perform AES-256-GCM encryption entirely in your browser. Your original file and encryption key never leave your device.

To encrypt a file: open the File Encrypt tool, drop your file, enter a strong password, and click Encrypt. The tool generates an encrypted file that can only be decrypted with the same password.

The encrypted output includes integrity verification — if anyone tampers with the encrypted file, decryption will fail and alert you. This provides both confidentiality and tamper detection.

To decrypt, use the same tool: drop the encrypted file, enter your password, and click Decrypt. The original file is restored exactly as it was before encryption.

Open File Encrypt →

Frequently Asked Questions

How secure is AES-256 encryption?

AES-256 is used by the U.S. government for top-secret information. With a strong password, it is effectively unbreakable with current technology.

What happens if I forget my password?

There is no recovery mechanism. If you lose the password, the encrypted file cannot be decrypted. Always store your passwords securely.

Can I encrypt multiple files at once?

Currently, the tool encrypts one file at a time. To encrypt multiple files, create a ZIP archive first and then encrypt the ZIP file.