Image Steganography
Conceal text inside the pixels of an image and read it back later — image steganography that works free, right in your browser.
Drop an image to hide a message in
Drag & drop, paste, or pick a file
PNG · JPG · WebP — processed on your device
What is image steganography?
Image steganography hides data inside a picture by making changes too small to see. The classic method — the one this tool uses — is LSB, or least-significant-bit, encoding: each pixel's red, green and blue values have their lowest bit replaced with a bit of your message. Because that bit is worth only 1 of 255 levels, the image looks exactly the same.
The result is an ordinary-looking image that secretly carries your text. Anyone can view the picture normally; only this tool (with the password, if you set one) can recover the hidden words.
How image steganography works here
- Open a cover image. Drag, choose, or paste the photo you want to hide a message inside.
- Embed your message. Type the text; it is encoded into the pixels' least-significant bits, optionally encrypted with a password first.
- Download the PNG. Save the lossless PNG so the embedded bits — and your message — are preserved.
Choose a detailed image
Busy photos with lots of texture and colour variation hide data best, because the tiny LSB changes blend into the natural noise. Flat areas of solid colour can show faint artefacts under heavy analysis, so a richly detailed picture is the safer cover.
More steganography tools
Frequently asked questions
What does LSB steganography mean?
LSB stands for least-significant bit. The message is written into the lowest bit of each colour channel, the bit that affects the image the least, so the picture looks unchanged.
How much data can an image hold?
About one character for every three pixels. An 800×600 image holds roughly 180,000 characters; bigger images hold more. A live meter shows the capacity.
Can the hidden message be encrypted?
Yes. Set a password and the message is encrypted with a key derived from it before being embedded, so it is unreadable without the password.
Where is my image processed?
The hiding and extracting happen in your browser, so the new file is created on your own device. How any data associated with the tool is handled is described in our privacy policy.
More image tools
Crop an image
Crop to any ratio or an exact pixel size.
Image toolCompress an image
Shrink file size without visible quality loss.
Image toolResize an image
Change dimensions to exact pixels or presets.
Image toolRotate an image
Rotate 90°, flip, or straighten a tilted photo.
Image toolConvert HEIC to JPG
Turn iPhone HEIC photos into universal JPG.