Steganography Online
Hide secret messages inside images or decode hidden text from images. Use steganography to embed invisible text data into PNG, JPG, and WebP files securely.
or drop an image here or paste
Hide secret messages inside images or decode hidden text from images. Use steganography to embed invisible text data into PNG, JPG, and WebP files securely.
or drop an image here or paste
Steganography Online is a free tool for hiding secret text messages inside images using LSB (Least Significant Bit) encoding. Unlike encryption which scrambles data, steganography conceals the existence of the message itself by embedding it invisibly within image pixels. The tool supports PNG, JPG, and WebP formats for both encoding and decoding hidden messages.
Upload any PNG, JPG, or WebP image to begin. Enter your secret message in the text area - the tool calculates maximum capacity based on image size. Click "Embed Message" to encode the text into the image pixels using LSB steganography. Download the output as PNG to preserve the hidden data perfectly. The image looks identical to the original, but contains your concealed message that only someone with this decoder can read.
To extract hidden messages from steganographic images, upload the image and switch to "Decode" mode. The tool automatically scans the image pixels for embedded LSB data and extracts any hidden text. If a message exists, it appears instantly in the decoded message box. Copy the revealed text with one click. Works with any image that was encoded using LSB steganography techniques.
Least Significant Bit (LSB) steganography works by modifying the last bit of each color channel in image pixels. Since changing the LSB creates minimal visual difference (less than 1 value change per channel), the modifications are imperceptible to human eyes. Each pixel can store 3 bits of data (one per RGB channel), allowing large images to conceal thousands of characters. This technique balances invisibility with capacity better than other steganography methods.
Use steganography for digital watermarking, copyright protection, secure communication, privacy applications, or CTF competitions. Hide confidential notes in portfolio images, embed authentication codes in product photos, or create puzzle hunts with hidden clues. Unlike encrypted files which attract attention, steganographic images appear completely normal. Perfect for journalists protecting sources, businesses securing intellectual property, or anyone needing covert data transmission that bypasses content filters.
Always download steganographic images as PNG format to maintain lossless quality. JPG compression destroys hidden data by altering pixel values during the compression process, making messages unrecoverable. PNG preserves exact pixel values, ensuring your embedded message survives intact. The tool automatically sets PNG as default output format. For maximum security and reliability, only share steganographic images in PNG or other lossless formats like WebP lossless mode.