Video Frame LSB Hider

Video Frame LSB (Least Significant Bit) steganography is a technique for hiding secret data inside digital video files by modifying the lowest bits of pixel color values across individual frames. Each video frame is an image, and LSB steganography on video works the same as on images - but distributed across potentially thousands of frames. This makes detection even harder because each frame contains only a fraction of the hidden data. The changes to pixel values are so subtle (changing a value from 128 to 129, for example) that the human eye cannot perceive any difference between the original and modified frames. Videos are particularly well-suited for steganography because they have high data capacity (each frame contributes RGB pixels), temporal redundancy masks small visual changes, and the complex nature of video makes statistical detection more challenging than with static images.

The tool processes videos entirely in your browser using the HTML5 Canvas API and MediaRecorder in three stages:

1. Upload and frame extraction: Upload a video file (MP4, WebM, MOV). The tool reads the video metadata including dimensions, duration, and frame count. Each frame of the video is accessible via the HTML5 Video API for pixel-level manipulation using Canvas.
2. LSB encoding or decoding: In encode mode, your secret message is converted to a binary bit stream with a 32-bit length prefix. Each bit is embedded into the least significant bits of RGB pixel values across video frames. You can choose 1-4 bits per channel - lower values are more stealthy, higher values offer more capacity. In decode mode, the tool reads the LSB data from pixel values, reconstructs the bit stream, extracts the length prefix, and decodes the message.
3. Results and export: After encoding, you can preview stego frames and download them as PNG images. The tool shows statistics including frames modified, bits stored, and total capacity used. After decoding, the extracted message is displayed for copying.

• 1-bit LSB (Stealthiest): Uses 1 bit per RGB channel per pixel. With 3 channels per pixel, a 1920x1080 frame stores ~607 KB. The visual change is completely imperceptible to the human eye. Recommended for maximum stealth.
• 2-bit LSB (Balanced): Uses 2 bits per channel - doubles the capacity to ~1.2 MB per frame while maintaining good visual quality. The slight increase in noise is generally not noticeable in video content with natural variation.
• 3-bit LSB (High Capacity): Stores ~1.8 MB per frame. May introduce faint visual noise in areas of solid color (like blue skies or white backgrounds) but is often masked by natural video grain and compression artifacts.
• 4-bit LSB (Maximum Capacity): Stores ~2.4 MB per frame. Visible noise may appear in smooth gradient areas. Each frame uses the higher 4 bits (values 0-15), which can cause banding in smooth gradients. Use only when maximum capacity is needed.

This tool runs entirely in your browser using client-side JavaScript and the HTML5 Canvas API. The video you upload, all secret messages, encoded frames, and extracted data are never uploaded to any server, stored in any database, or transmitted over the network. All LSB manipulation, frame extraction, encoding, and decoding executes locally on your device. There are no API calls, analytics tracking, cookies, or data collection of any kind. This makes it completely safe for sensitive communications, proprietary content watermarking, or forensic analysis of video files.