File Encryption Online – Encrypt and decrypt files securely using AES-256 encryption. This free online file encryption tool protects documents, images, PDFs, and text files through secure in-memory processing without installing any software.
To encrypt a file online, upload your file, optionally enable a secret passkey, and download the encrypted output instantly.
Uploaded files are never stored, logged, or retained after encryption completes.
Decrypt previously encrypted files securely using the correct secret key.
We do not store, log, or retain any files, passwords, or keys you enter. This tool is intended for educational and personal use. Do not use online tools to protect real production secrets.
This online file encryption tool uses AES-256 (Advanced Encryption Standard) to securely encrypt and decrypt files. Encryption is performed using modern, authenticated cryptography and secure in-memory processing. Uploaded files are never stored, logged, or retained after encryption or decryption completes.
The best way to encrypt a file depends on your use case, security requirements, and key management strategy. Below are commonly used encryption approaches and where they fit best:
AES is a symmetric encryption algorithm, meaning the same secret key is used for both encryption and decryption. AES-256 refers to the use of a 256-bit encryption key, which is currently considered secure against brute-force attacks.
If the password provided during decryption does not match the original password, decryption will fail or produce invalid output.
Fix: Always use the exact same password used during encryption.
AES-GCM performs integrity checks. Any modification to the encrypted file (even one byte) will cause decryption to fail.
Fix: Do not rename, edit, compress, or modify encrypted files.
Password-based encryption is not ideal for sharing files with multiple recipients.
Fix: Use PGP File Encryption for secure file sharing.
| Feature | AES | RSA | PGP |
|---|---|---|---|
| Large file support | Yes | No | Yes |
| Password-based | Yes | No | Optional |
| Multiple recipients | No | No | Yes |
This tool encrypts files using AES-256-GCM, a modern authenticated encryption algorithm. A secure encryption key is derived from your password using PBKDF2 with HMAC-SHA256, along with a random salt and IV. The encrypted output includes all required metadata to allow safe decryption later.
No. Files are processed securely in memory and are never stored, logged, or retained after encryption or decryption completes. Your password and encryption keys are never saved.
If the password is lost, the encrypted file cannot be recovered. AES-256 encryption is designed to be computationally infeasible to break without the correct password. There is no password reset or recovery mechanism.
Yes. AES is specifically designed for encrypting large files efficiently. For secure file sharing with multiple recipients, consider using PGP file encryption.
RSA is an asymmetric encryption algorithm and is not suitable for encrypting large files. This tool uses AES symmetric encryption, which is fast and efficient for files. RSA is typically used to encrypt AES keys, not file data directly.
Yes. AES-GCM provides built-in authentication. If the encrypted file is modified or corrupted, decryption will fail automatically, preventing tampered data from being recovered.
Use AES file encryption for password-protected files. Use PGP encryption for secure file sharing. Use RSA only for encrypting small secrets or keys.
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