Hidden Message
Hide and reveal messages in images.
About Hidden Message
The Hidden Message tool uses steganography to embed a secret text message inside an image, or to extract a message that was hidden earlier. The image looks visually identical after embedding, so the technique is used for private notes, watermarking personal files, and sharing information discreetly. Choose between hide and extract modes, upload a cover image (PNG works well), type your message, set an encryption password, and click "Hide Message". Only someone with the password and the same tool can reveal the text. All encoding happens locally, so neither the image nor the message ever travels to a server.
Key Features
- ✓Hide text inside an image with a password
- ✓Extract hidden messages from steganographic images
- ✓Hide and extract modes in one tool
- ✓Visually identical output after embedding
- ✓PNG recommended for high-quality cover images
- ✓Runs entirely in the browser
How to Use Hidden Message
- 1
Choose an Operation Mode
Select whether to hide a message in an image or extract a hidden message from one.
- 2
Upload a Cover Image
For hiding, select a high-quality image large enough to hold your message. PNG preserves quality well for steganography.
- 3
Enter the Secret Message
Type the text you want to conceal. Keep messages reasonably short for reliable embedding.
- 4
Set an Encryption Password
Create a strong password and remember it, because extraction requires the same password.
- 5
Hide or Extract
Click "Hide Message" to embed the text or "Extract Message" to reveal it, then download the image or copy the message.
Read the complete step-by-step guide with screenshots and pro tips
Common Use Cases
- •A user embeds a recovery code inside a personal photo.
- •Two colleagues exchange notes concealed in ordinary-looking images.
- •An artist adds invisible copyright text to published artwork.
- •A puzzle creator hides clues inside pictures for a scavenger hunt.
- •A user verifies that a hidden message can be extracted before sending it.
Frequently Asked Questions
Where do my image and message go during processing?
They stay on your device. Encoding and decoding run entirely in your browser, which is important for a tool whose purpose is privacy. Nothing is uploaded.
What kind of image should I use as a cover?
Choose a high-quality, uncompressed image such as PNG, large enough to hold the message. Larger images can conceal longer messages.
Is the Hidden Message tool free?
Yes, it is free with no signup and no limit on use. Share the password through a separate channel from the image.