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Free Online AES Encrypt / Decrypt

Symmetric encryption using AES-GCM, AES-CBC, or AES-CTR with 128/192/256-bit keys. Entirely client-side.

Password is used with PBKDF2 (100,000 iterations) to derive the encryption key.

What is AES Encryption?

AES (Advanced Encryption Standard) is a symmetric encryption algorithm adopted by the U.S. government and used worldwide. It encrypts and decrypts data using the same key, making it fast and efficient for bulk data encryption.

This tool uses PBKDF2 with 100,000 iterations to derive a strong encryption key from your password, combined with a random salt and IV for each encryption. This means the same plaintext encrypted twice will produce different ciphertexts.

Supported Modes

AES-GCM (Recommended)

Authenticated encryption with integrity check. Detects tampering automatically.

AES-CBC

Classic block cipher mode. Widely compatible with other systems and libraries.

AES-CTR

Stream cipher mode. Efficient for streaming data and parallel processing.

128/192/256-bit Keys

Choose your security level. 256-bit provides the strongest protection.

Frequently Asked Questions

Is my data secure?
Yes. All encryption and decryption happens entirely in your browser. No data or passwords are ever sent to any server.
Which mode should I use?
AES-GCM is recommended for most use cases. It provides both encryption and authentication (integrity checking) in one step.
Can I decrypt data encrypted with another tool?
Only if it uses the same format (PBKDF2 key derivation with the same parameters). This tool uses its own format with embedded salt and IV.
What happens if I use the wrong password?
Decryption will fail with an error. AES-GCM will detect the wrong key; CBC and CTR may produce garbage output.

Need asymmetric encryption?

Try our RSA Key Generator for public/private key cryptography, or the Password Generator for secure passwords.

All Tools

About the AES Encrypt / Decrypt

The AES Encrypt / Decrypt is a free online tool that lets you symmetric encryption with AES-GCM, CBC, CTR and 128/192/256-bit keys. It runs entirely in your browser with no sign-up required, so you get instant results while your data stays on your device. It is built for developers, designers, and anyone who needs a fast, reliable aes encrypt / decrypt without installing software.

How to use the AES Encrypt / Decrypt

  1. 1Open the AES Encrypt / Decrypt and enter or paste your input.
  2. 2Adjust the available options to match what you need.
  3. 3View the result instantly as you work.
  4. 4Copy or download the output to use in your project.

Frequently asked questions

Is the AES Encrypt / Decrypt free to use?

Yes. The AES Encrypt / Decrypt is completely free with no account, sign-up, or installation required.

Is my data private when I use the AES Encrypt / Decrypt?

This tool runs entirely in your browser. Your data is never uploaded to a server, which makes it safe to use with sensitive input.

Do I need to install anything?

No. The AES Encrypt / Decrypt works in any modern web browser on desktop or mobile, with nothing to download.

Can I use the AES Encrypt / Decrypt on mobile?

Yes. The tool is responsive and works on phones, tablets, and desktops.

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