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How to hide and reveal a message

  1. Choose "Hide a message in an image" and upload a PNG cover; the tool shows the most text that image can hold.
  2. Type your secret message, and optionally set a password to encrypt it before it is hidden.
  3. Click "Hide message and download PNG" - the new PNG looks identical but carries your note in its pixels.
  4. To read one back, switch to "Reveal a hidden message", upload the PNG, enter the password if you set one, and the hidden text appears.

Steganography

Hide a secret text message inside an ordinary PNG image - the picture looks identical to the eye but carries your hidden note in its pixels.

You can lock the hidden message with a password, so only someone who knows it can read it back.

The result stays a PNG, because the message lives in the least-significant bit of each pixel and re-saving as JPG would erase it.

New to this? Read How to hide a message in an image for a step-by-step walkthrough.

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Tags: #image-editing

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Frequently Asked Questions

What does Steganography do?

Hide a secret text message inside an ordinary PNG image - the picture looks identical to the eye but carries your hidden note in its pixels.

When should I reach for steganography?

Lock the hidden message with a password, so only someone who knows it can read it back.

Is my image or message uploaded to a server?

Everything runs in your browser on your own device - the image and the message are never uploaded to a server.