Plaintext Message
Required to generate the 256-bit AES key locally.
Ciphertext (Encrypted)
We use **PBKDF2** for key derivation and **AES-GCM** for encryption. Each encrypted message contains a unique random IV and salt for maximum entropy.
What is the AES Encryption Tool?
The AES Encryption Tool lets you encrypt and decrypt text directly in your browser using the AES-256-GCM algorithm — one of the strongest symmetric encryption standards used by governments and financial institutions worldwide. Unlike server-side encryption services, this tool performs all cryptographic operations inside your browser using the Web Crypto API. No plaintext, keys, or ciphertext ever leave your device.
Enter your message, provide an encryption passphrase, and receive Base64-encoded ciphertext instantly. Share the ciphertext safely over any channel — only someone with your exact passphrase can decrypt it.
How to Use the AES Encryption Tool
Encrypting and decrypting text involves these steps:
- Type or paste the text you want to protect into the Message input field.
- Enter a strong passphrase in the Key / Passphrase field. This passphrase is used to derive the AES-256 encryption key.
- Click "Encrypt" to generate Base64-encoded ciphertext. Copy and store it securely.
- To decrypt, paste the ciphertext into the Message field, enter the same passphrase, and click "Decrypt".
- The decrypted plaintext appears instantly. If the passphrase is wrong, decryption fails with an error.
Key Features
- AES-256-GCM Algorithm: Uses authenticated encryption that protects both confidentiality and data integrity.
- Web Crypto API: Cryptographic operations run natively in the browser — no third-party JS libraries required.
- Zero Server Contact: All encryption and decryption happens entirely client-side. No data is transmitted.
- Base64 Output: Encrypted output is safely encoded for copying, emailing, or pasting into any text field.
Common Use Cases
This tool is helpful for the following tasks:
- Confidential Text Sharing: Encrypting sensitive messages before sending them over email, chat, or SMS.
- Secure Local Storage: Encrypting private notes or credentials before saving them to a plain-text file.
- Developer Testing: Testing encryption workflows and understanding AES-GCM output formats during development.
Frequently Asked Questions
Is AES-256 truly secure?
Yes. AES-256-GCM is used by the US government (NIST standard), financial institutions, and TLS 1.3. With a strong passphrase, brute-forcing is computationally infeasible.
What happens if I forget my passphrase?
There is no recovery mechanism. The ciphertext is mathematically unrecoverable without the exact passphrase. Store your passphrase securely.
Can I encrypt files with this tool?
This tool is designed for text. For file encryption, use the File Locker (AES-256) tool on this site.
Is the passphrase stored anywhere?
No. The passphrase is used only in memory during the cryptographic operation and is never stored, logged, or transmitted.
Privacy & Data Note
All encryption and decryption operations run entirely inside your browser using the Web Crypto API. Your plaintext, passphrase, and ciphertext never leave your device and are never transmitted to any server.
Frequently Asked Questions
Yes. AES-256-GCM is used by governments, financial institutions, and all modern TLS connections. With a strong passphrase, the ciphertext is computationally infeasible to brute-force.
There is no recovery mechanism. AES encryption is a one-way lock with your passphrase as the key. Store it securely — a password manager is recommended.
Never. All cryptographic operations run locally in your browser via the Web Crypto API. No plaintext, key, or ciphertext is transmitted anywhere.
🔒 100% Client-Side Encryption. No server contact. No data stored. Last updated: April 10, 2026.