TTImgDec — Grayscale Image Decoder
LSB steganography decoder — extract hidden files from images and videos
Click or drag file here
Images: PNG, JPG, BMP, WebP | Video: MP4, WebM, MOV, MKV
File never leaves your browser📦
—
How TTImgDec Works
TTImgDec extracts files hidden inside images and videos using LSB (Least Significant Bit) steganography. The decoder reads the least significant bit of each RGB channel in every pixel to reconstruct the embedded binary data.
Decoding protocol
- First 32 bits encode the total payload length
- Payload starts with 1 byte for extension length, then the extension string (e.g.
mp4) - 4 bytes for the actual file size, followed by the raw file bytes
- For videos, the first frame of the video is used as the carrier image
Supported carriers
- Images: PNG, JPG/JPEG, BMP, WebP — decoded directly from pixel data
- Videos: MP4, WebM, MOV, MKV — first frame is extracted, then decoded
Watermark option
If the carrier image has visible watermarks in the top or bottom areas that may have corrupted the LSB data, enable "Remove watermark area" to skip those rows during decoding.