AES-256 Text Encryptor Online
Encrypt and decrypt text with AES-256-GCM encryption. Works 100% offline in your browser using WebCrypto API. Free, secure, no data uploads.
Encrypt sensitive text using AES-256-GCM encryption. All processing happens in your browser with zero server communication.
How to Use AES-256 Text Encryptor Online
- Create a Strong Password: Enter a password in the "Password" field. Use at least 12 characters with a mix of uppercase, lowercase, numbers, and symbols. This password will be used to encrypt and decrypt your text.
- Enter Your Text: Type or paste the text you want to encrypt into the "Input Text" area. This can be any sensitive information like passwords, messages, or private notes.
- Click "Encrypt": Press the 🔒 Encrypt button to convert your plaintext into encrypted Base64 output. The encryption uses AES-256-GCM with a randomly generated initialization vector, so the same text encrypted twice will produce different results.
- Copy or Download: Use the 📋 Copy button to copy the encrypted text to your clipboard, or click 💾 Download to save it as a text file. You can safely share or store this encrypted data.
- To Decrypt: Paste the encrypted Base64 text back into the "Input Text" area, enter the same password you used for encryption, and click 🔓 Decrypt. The original text will appear in the output.
- View Statistics: After encryption or decryption, you'll see statistics showing the byte size of the input and output, helping you understand the encryption overhead.
- Clear Fields: Click the 🗑️ Clear All button to reset all fields and start fresh. You can also press the Escape key as a shortcut.
Frequently Asked Questions
Is my data secure when using this encryption tool?
Yes, absolutely secure. This tool uses AES-256-GCM encryption running 100% client-side in your browser via the native WebCrypto API. Your text and passwords never leave your device or get sent to any server. All encryption and decryption happens locally.
Is this AES encryption tool free?
Yes, completely free with unlimited usage. You can encrypt and decrypt as much text as you need without any costs, restrictions, or usage limits.
What encryption algorithm does this use?
This tool uses AES-256-GCM (Advanced Encryption Standard with 256-bit keys in Galois/Counter Mode), which is a military-grade encryption standard trusted by governments and security professionals worldwide. The password is processed through PBKDF2 key derivation with 100,000 iterations for additional security.
Does this work offline?
Yes, once loaded, this tool works completely offline. Since all encryption happens in your browser using native WebCrypto APIs with no server communication, you can use it without an internet connection.
What happens if I forget my password?
Unfortunately, if you forget your encryption password, your encrypted data cannot be recovered. AES-256 encryption is designed to be unbreakable without the correct password. Always store your passwords securely, such as in a password manager.
Can I decrypt text encrypted with other AES tools?
This tool uses AES-256-GCM with PBKDF2 key derivation and specific parameters (100,000 iterations, 16-byte salt, 12-byte IV). It may not be compatible with other AES implementations that use different modes, key derivation methods, or parameters. For best results, encrypt and decrypt using this same tool.
What is the Base64 output format?
After encryption, your data is converted to Base64 encoding, which represents binary encrypted data as text using only letters, numbers, and a few symbols. This makes it safe to copy, paste, and transmit through text-based systems like email or messaging apps.
How strong should my password be?
Use a strong, unique password with at least 12 characters, combining uppercase and lowercase letters, numbers, and symbols. The encryption is only as strong as your password. Weak passwords can be cracked through brute-force attacks.
Can I encrypt large amounts of text?
Yes, you can encrypt substantial text content. However, very large texts may take a moment to process. The tool handles everything in-memory, so extremely large texts (multiple megabytes) might slow down depending on your device’s capabilities.
Is the encrypted output the same every time for the same input?
No, each encryption generates a unique initialization vector (IV), so the same text encrypted with the same password will produce different encrypted outputs each time. This is a security feature that prevents pattern analysis attacks.