How to Encrypt a Text Message with a Password (No App Needed)

The short answer

To encrypt a text message with a password, paste it into a browser-based AES-256 encryption tool, enter a strong password and copy the encrypted result. Send that result over any app. The recipient pastes it into the same tool, enters the password and reads the original text. Share the password separately, never in the same chat.

Step by step

1. Open the text encryption tool and keep it on Encrypt.
2. Type or paste your message.
3. Enter a passphrase — four or more random words, or a long password from the password generator.
4. Select Encrypt text and copy the full result, which starts with VFdQM.
5. Paste it into email, SMS, WhatsApp or a document.
6. Tell the recipient the password by phone or in person.
7. They switch the tool to Decrypt, paste the text, enter the password and read the message.

What happens to your text

The tool derives a 256-bit key from your password with PBKDF2-SHA256 (600,000 iterations and a random salt), then encrypts with AES-256-GCM using a random nonce. Everything runs in your browser through the Web Crypto API; the page sends neither the message nor the password to a server.

GCM is authenticated encryption: if anyone changes a single character of the ciphertext, decryption fails rather than producing altered text.

Password-encrypted text vs an encrypted chat room

For an ongoing private conversation without accounts, use ChatCrypt. For a single secret you want to drop into an existing thread, password encryption is simpler.

Limits to know

• A forgotten password cannot be recovered — not by you, not by ToolsWebPro.
• Anyone who obtains both the ciphertext and the password can read the message.
• Encryption does not prove who sent the message. Confirm the sender through another channel if it matters.
• Malware on either device can read the text before encryption or after decryption.