AES Encryption Tool - Secure Browser-Based Encryption

Encrypt and decrypt text with AES-256-GCM in your browser. Password-based encryption, Base64/Hex output. Private, secure, no server uploads.

Security Best Practices

Use strong passwords: Minimum 16 characters, mix letters/numbers/symbols
Never reuse passwords: Each encryption should use a unique password
Store passwords securely: Use a password manager, never plain text
Browser-only processing: No data is uploaded; encryption happens on your device
Lost password = lost data: There is no recovery mechanism

AES-256-GCM Encryption

Password / Encryption Key

Use at least 16 characters. Longer = more secure.

Input Text

Output Ready

Base64

Hex

Encryption Details

Algorithm: AES-256-GCM

Key Derivation: PBKDF2-SHA256

Iterations: 100,000

Key Size: 256 bits

IV Size: 12 bytes (96 bits)

Salt Size: 16 bytes (128 bits)

How It Works

Random salt (16 bytes) is generated
Password + salt → PBKDF2 (100k iterations) → 256-bit key
Random IV (12 bytes) is generated
Text is encrypted with AES-256-GCM
Authentication tag ensures integrity
Salt + IV + ciphertext + tag = output

Password Strength Guide

Weak < 8 characters

Fair 8-11 characters

Good 12-15 characters

Strong 16+ characters

Tips: Mix uppercase, lowercase, numbers, and symbols. Avoid dictionary words and personal info.

Use Cases

Secure note storage
Password-protected messages
Sensitive data backup
Encrypted configuration files
Privacy-focused communication

Important Warnings

No password recovery: Lost password = lost data permanently
Don't modify output: Any change breaks decryption
Keep passwords secure: Never share via email/SMS
Test before real use: Verify encrypt/decrypt works

Sample Passwords (For Testing Only - Never Use These for Real Data!)

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Frequently Asked Questions

AES (Advanced Encryption Standard) is the most widely used symmetric encryption algorithm, approved by the US government for classified information. It encrypts data in 128, 192, or 256-bit blocks using a secret key. This tool uses AES-256-GCM, the strongest variant with authenticated encryption.

GCM (Galois/Counter Mode) is an authenticated encryption mode that provides both confidentiality and integrity. It encrypts your data with AES-256 (256-bit keys) and generates an authentication tag to detect tampering. This prevents attackers from modifying encrypted data without detection.

Your password is converted to a cryptographic key using PBKDF2 (Password-Based Key Derivation Function 2) with 100,000 iterations. This makes brute-force attacks computationally expensive. A random salt ensures the same password generates different encryption keys each time.

Yes, when used properly. AES-256-GCM with PBKDF2 is cryptographically secure and approved for top-secret data. However, security depends on your password strength - use long, random passwords (16+ characters). Everything runs in your browser; no data leaves your device.

Both represent encrypted binary data as text. Base64 uses A-Z, a-z, 0-9, +, / (shorter output, ~33% overhead). Hex uses 0-9, A-F (longer output, 100% overhead, easier to read). Base64 is more efficient; Hex is more human-friendly.

No. AES is symmetric encryption - the same password encrypts and decrypts. If you lose the password, the data is unrecoverable. There are no backdoors or master keys. This is fundamental to cryptographic security.

Each encryption uses a random IV (Initialization Vector) and salt to ensure uniqueness. The same plaintext and password will always produce different ciphertext. This prevents pattern analysis attacks. The IV and salt are stored with the encrypted data for decryption.

Never share your password over insecure channels. Never reuse passwords across different data. Never store passwords in plain text near encrypted data. Never modify encrypted output (even whitespace). Never use short or dictionary-word passwords.

Classical ciphers like Caesar and Vigenère are educational toys, easily broken in seconds. AES-256 is military-grade encryption used by governments and banks. It's mathematically proven secure against all known attacks when used correctly with strong passwords.

This tool is designed for text encryption. For files, use dedicated tools. Text is UTF-8 encoded before encryption. Large texts work fine, but consider dedicated file encryption tools (like VeraCrypt) for documents, images, or archives.