Question 1

Why does it only accept PNG images?

Accepted Answer

PNG is a lossless format, so the least-significant bits used to hide the message survive perfectly. JPEG's lossy compression would scramble or destroy the hidden bits, so JPEG uploads are rejected.

Question 2

How is the message hidden?

Accepted Answer

Each bit of your message replaces the least-significant bit of a red, green, or blue color channel — a change too small to see, preceded by a 32-bit header that stores the message length.

Question 3

How much text can I hide?

Accepted Answer

It depends on the image's pixel count — roughly one character per 8 pixels. The tool tells you the exact limit and blocks encoding if your message is too long.

Question 4

Does hiding a message change how the image looks?

Accepted Answer

No, the pixel value changes are so small (at most 1 out of 255) that they're invisible to the human eye.

Question 5

Is my image or message uploaded to a server?

Accepted Answer

No, both encoding and extraction happen entirely in your browser using the Canvas API.

Text Steganography

How to use it

Frequently asked questions

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