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v7.0

Secret Message Encoder

Turn a private message into unreadable text that only your friend can unlock with the password.

AES-256 encryption
No data ever stored
Works offline once loaded
👋 New here? Type your message → set a password → press Encrypt. That's it — decrypting works the same way in reverse.
Your message ?Type or paste the message you want to lock with a password.
You can also drag & drop a .txt file here 0 / 20,000 characters
Scan a QR code ?Point your camera at a QR code someone sent you, or upload a screenshot/photo of one — the encrypted text will be read straight into the box above.

Camera access needs your permission, and works best on https:// pages.

Password ?Anyone who wants to unlock this text will need this exact password.
Confirm password
Password strength: —
Cipher: AES-256-GCM (authenticated) · Key derived with PBKDF2-SHA256 (60,000 iterations) using your browser's native encryption engine — fast, and far stronger against brute-force than a single hashing round. ?This is a real security upgrade, not just a label: deriving the encryption key takes real computational work, which makes large-scale password-guessing attacks dramatically slower.
Second password
Both passwords will be needed to unlock this message. Store them separately for maximum security.
Self-destruct ?After this time, the message can no longer be decrypted — even with the right password.
Password hint (optional) ?Shown to anyone with the encrypted text, before they enter a password. Never put the password itself here.
Overall protection: Basic Set a stronger password to improve this score.

Result
Cover image (optional)

Leave empty and we'll auto-generate a suitable image. PNG output only — JPEG, WhatsApp, and other apps that recompress images will destroy the hidden data, so share the downloaded PNG file directly.

Scan to copy the encrypted text on another device.

Keep creating

Message locked? Share it as a QR code QR Code Generator Fancy another code? Try Morse code Morse Code Translator Want to hide text? Try invisible text Invisible Text Generator

About this generator

A secret message encoder scrambles your message so that anyone who sees it only sees random characters. Write your message, set a password, and share the result in a chat, by email, as a link or as a QR code. Tell your friend the password in another way, such as in person or by phone, and they can decode the message on the Decrypt tab.

How to use this tool

  1. 1

    Write the secret

    Type your message and add a password hint if you like.

  2. 2

    Encode and share

    Send the encoded text, a link or a QR code.

  3. 3

    Send the password separately

    Give the password in another channel so only your friend can open the message.

Frequently asked questions

How do I share the password safely?
Use a different way than the message itself, for example tell them in person or by phone.
Can I add a hint for my friend?
Yes. The hint field is shown to the person who opens the message.
Is this the same as a cipher or code?
It is real AES-256 encryption, much stronger than simple letter-swap ciphers.

More text encryption tools

Text Encrypt & Decrypt Encrypt Text Decrypt Text AES-256 Encryption Password Protect Text Self-Destructing Message Hide Text in Image Encrypted QR Code Encrypt WhatsApp Messages Double Encryption

Related tools

QR Code Generator Invisible Text Generator Morse Code Translator