How should I share the password?

Use a different channel. Email the ciphertext, share the password via Signal or in person.

What if the password is wrong?

AES-256-GCM authentication will fail, so you know immediately decryption was unsuccessful.

Is this as secure as Signal?

The encryption is equally strong, but key exchange is manual. Signal handles key management automatically.

Can I encrypt files too?

Use the File Encryptor for files. This tool is for text messages.

Secure Message

Free online encrypted message tool. AES-256-GCM encrypted messages with password-based encryption. Client-side only, no server involved.

Free online encrypted message tool. AES-256-GCM encrypted messages with password-based encryption. Client-side only, no server involved. Type your secret message in the message input field. Enter a strong password that will be used for AES-256-GCM encryption. Click "Encrypt" to generate ciphertext locally in your browser. Share the ciphertext and password through separate channels — the recipient uses the password to decrypt. Encrypts in your browser using Web Crypto API. Ciphertext is generated locally. You share the password separately.