Symmetric Encryption
Encrypt or decrypt text securely with AES-256-GCM using a PBKDF2-derived passphrase key. All cryptographic operations occur exclusively in your browser.
AES-GCM Symmetric Encryption Online
Need to securely transmit a secret message or store sensitive data? Our free online Symmetric Encryption Tool utilizes the military-grade AES-256-GCM (Advanced Encryption Standard with Galois/Counter Mode) algorithm to encrypt and decrypt your text. By providing a passphrase, your data is converted into an unreadable ciphertext format.
Total Privacy: This tool utilizes the native Web Crypto API. Encryption and decryption occur entirely within your browser's memory. Your raw text and secret passphrase never leave your device.
Core Features
- Authenticated Encryption (GCM)Unlike older modes like CBC, GCM provides both data confidentiality and authenticity. If a hacker tampers with your encrypted ciphertext, the decryption process will instantly detect the manipulation and fail securely.
- PBKDF2 Key DerivationWe don't just use your raw passphrase. Your password is computationally stretched using PBKDF2 (Password-Based Key Derivation Function 2) with a random salt to generate a strong 256-bit encryption key, thwarting dictionary attacks.
- Packaged Output FormatThe resulting ciphertext is bundled together with its initialization vector (IV) and salt into a single, easy-to-copy Base64 string for seamless sharing and storage.
How AES-GCM Protects Data
Plaintext + Password
Message
My highly secret API token
Password
hunter2
Encrypted Payload (Base64)
U2FsdGVkX19zB7x... (Contains Salt + IV + Ciphertext + Auth Tag)
Related Tools
AES Key GeneratorGenerate raw 256-bit symmetric keys instead of using a password.Asymmetric EncryptionEncrypt data using public/private RSA key pairs.Hash GeneratorCreate one-way cryptographic digests (SHA-256) of your text.Password GeneratorGenerate a stronger, unguessable passphrase for your encryption.
Categories
Frequently Asked Questions
What is Symmetric Encryption?
Symmetric encryption means that the exact same key (or password) is used for both encrypting the plaintext and decrypting the ciphertext. If you encrypt a file with a password and send it to a friend, they must know that exact same password to open it.
Can you recover my data if I forget the password?
No. AES-256 is mathematically unbroken. Because all encryption happens locally in your browser, we do not store your passwords or your ciphertexts. If you lose the password, your encrypted data is permanently inaccessible.