Encrypt and Decrypt Text with AES Online
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About This Tool
The AES Encryption tool allows you to protect your sensitive messages using the Advanced Encryption Standard — the same algorithm used by governments and banks to secure data — ensuring your privacy in transit. It supports custom keys for maximum control. This tool is free, private, and processes all logic locally.
How to Use
- 1
Enter your plaintext message and a secure passphrase in the input fields.
- 2
Click Encrypt to generate the AES-256 ciphertext — the output appears in the result panel.
- 3
To decrypt: paste the ciphertext, enter the same passphrase, and click Decrypt.
- 4
Copy the encrypted or decrypted result for use in your application or storage.
Frequently Asked Questions
Is AES-256 encryption secure?
Yes. AES-256 is the industry standard for symmetric encryption used by governments and security-critical applications worldwide. It is considered computationally unbreakable with a strong passphrase.
Can I use this for sensitive production data?
Use this tool for learning and testing. For production systems use established libraries like CryptoJS or Node.js crypto with proper key management.
Is this AES tool free?
Yes. Completely free with no account required.
What is AES encryption?
AES is a symmetric-key algorithm, meaning the same key is used for both encryption and decryption of your data.