How long can the hidden message be?

It depends on the image size: a larger image holds more. A meter shows how many bytes your message uses out of what the image can hold.

Why is the result always a PNG?

PNG is lossless, so the hidden bits survive. Saving the image as JPEG or WebP afterwards re-compresses it and erases the message.

Can others read the message if they find the image?

Without a password, anyone using this tool can extract it. With a password, the message is encrypted with AES-256-GCM first, and the same password is needed to read it.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Are my files uploaded?

No. Your files are opened and processed inside your browser and are not sent to LibraTool. Some tools first download a processing engine or AI model to your browser; that download contains no data of yours.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install. Very large files can be slow or run out of memory on a phone, so use a computer for those.

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Free Image Steganography (Hide Text in Image)

Hide a secret text message inside a PNG using least-significant-bit steganography, with optional AES-256-GCM password encryption. Extract it later with the same tool. Everything runs in your browser.

File size depends on your deviceFiles stay privateNo login requiredFree foreverNo watermarkLSB encodingAES-256-GCM optional

Works offline once loaded

Drop a file here, or click to browse

PNG, JPG, WebP, HEIC, HEIF · processed on your device

or press Ctrl+V to paste from your clipboard

Browse files

Your files never leave your device. All processing happens locally in your browser.

Secret message

Output size

A smaller picture is much easier to send. Hidden notes need very little room.

Password (optional but recommended)

How it works. Each pixel's red, green, and blue channels carry one bit of your message in its least-significant bit — invisible to the eye. Output is PNG (lossless); saving as JPEG or WebP afterward would re-compress and erase the hidden bits.

Adding a password encrypts the payload with AES-256-GCM (PBKDF2, 250 000 iterations) before hiding, so even someone who suspects the image carries data can't read it. Everything runs in your browser.

How It Works

Hides a text message inside an image by tucking it into the least-significant bit of each pixel's red, green, and blue channels — visually indistinguishable from the original, and recovered with the same tool.

1
You drop a host image
PNG, JPEG, or WebP. It is loaded into a canvas in your browser; nothing is uploaded.
2
The message is (optionally) encrypted, then hidden bit by bit
With a password, the message is encrypted with AES-256-GCM (PBKDF2, 250 000 iterations) first. Each bit goes into the LSB of an R, G, or B channel — three bits per pixel.
3
Download a PNG
The result is exported as lossless PNG. JPEG/WebP would re-compress and destroy the hidden bits, so PNG is the only safe carrier.

Everything happens in your browser. Your image and your message never reach our servers.

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