Hide Secret Messages Inside Images
Embed invisible text inside any photo using LSB pixel steganography. The image looks completely normal — only someone with this tool can reveal what's inside.
Drop an image to get started
PNG, JPEG, WebP · any size
Output is always PNG — JPEG compression destroys hidden data
How it works
Upload any photo
Drop a JPG, PNG, or WebP image. The bigger the image, the more text you can hide — a 1080p photo holds over 700,000 characters.
Type your secret message
Write anything — a note, coordinates, a code word. Add an optional password so only the intended recipient can read it.
Download & share
Download the output PNG. It looks pixel-perfect identical to the original. The receiver uploads it here to reveal the hidden text.
What is steganography?
Steganography is the art of hiding data within other data so the very existence of the hidden message is concealed. Unlike encryption (which makes data unreadable but visible), steganography makes the hidden data invisible. This tool uses LSB (Least Significant Bit) encoding — the last bit of each pixel's red, green, and blue channel is replaced with a bit from your message. Changing a pixel value by ±1 out of 255 is completely invisible to the human eye.
Frequently asked questions
Will anyone be able to tell a message is hidden?
No. LSB steganography changes the least significant bit of each RGB channel — a change of ±1 in a 0–255 value. The difference is completely imperceptible to the human eye and invisible to casual inspection.
Why must I use PNG output instead of JPEG?
JPEG is a lossy format — it slightly alters pixel values when saving to keep the file small. Those small alterations destroy the hidden LSB bits. PNG is lossless and preserves every pixel exactly.
What does the password do?
It XOR-obfuscates the message bytes before embedding them. Without the correct password, the extracted bytes are scrambled and unreadable. Note: this is obfuscation, not military-grade encryption — treat it as a deterrent, not a vault.
How much text can I hide?
About 3 bytes per 8 pixels (one bit per R, G, B channel). A 1920×1080 image holds roughly 777,600 bytes — enough for a short novel. A small 400×300 thumbnail holds about 45,000 characters.
Can I hide a message in a photo that already has one?
No — encoding overwrites the existing hidden payload starting from the first pixel. Reveal the existing message first, then re-encode both together if you need to chain messages.
Is my image or message stored anywhere?
Never. All processing — encoding and decoding — runs inside your browser using the Canvas API. Your files never touch a server.