What encryption algorithm does this tool use?

This tool uses AES-256 in authenticated GCM mode. Your password is stretched into a key with PBKDF2 (SHA-256, 250,000 iterations) using a random salt, and every message gets a fresh random initialization vector. This is a modern, military-grade encryption standard.

Is my data sent to any server?

No, all encryption and decryption happens entirely in your browser using the built-in Web Crypto API. Your messages, files and passwords never leave your device, ensuring complete privacy.

What happens if I forget my password?

If you forget the password used to encrypt a message, the message cannot be recovered. AES-256 encryption is designed to be infeasible to break without the correct password.

Can I encrypt any type of text or file?

Yes, you can encrypt any text including messages, notes and passwords, as well as files such as documents and images. The tool handles all Unicode characters and emoji correctly.

Is this encryption tool free?

Yes, the encryption and decryption tool is completely free with no signup required. All features are available at no cost.

Free Online Secret Message Encoder/Decoder (No Signup)

Your Secret Message

Encryption Password

Encrypt a file instead

Drop your file here or browse

Something went wrong

Encrypted Output

Encrypted Message

Decryption Password

Decrypt a file instead

Drop encrypted file here or browse

Incorrect password or invalid encrypted message

Decrypted Message

How to Use

1 Type your secret message or select a file, then enter a strong password that you'll share with your recipient separately.

2 Click Encrypt and share the encrypted output through any channel — email, chat, etc. You can also copy a self-contained shareable link.

3 Your recipient pastes the encrypted text (or opens your link), enters the password, and clicks Decrypt to reveal your message.

AES-256-GCM with PBKDF2 • Everything runs locally in your browser

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