Prusa Model Preview

Extract embedded preview images (PNG & QOI) from PrusaSlicer G-code and BGCode files.

Live Demo

Visit: https://unusualvibes.github.io/prusa-modelpreview/

Features

• Dual Format Support: Automatically detects and parses both G-code (text) and BGCode (binary) files
• Multiple Image Formats: Extracts PNG images and decodes QOI format thumbnails
• Drag & Drop: Simply drag your .gcode or .bgcode file onto the page
• Browser-Based: No uploads, no servers - everything runs locally in your browser
• Download Extracted Images: Save preview images to your computer

How to Use

1. Open the application in your browser
2. Drag and drop a .gcode or .bgcode file onto the drop zone (or click to browse)
3. View the extracted preview images
4. Download any images you want to save

Supported Files

• G-code files (.gcode): Text-based files with base64-encoded PNG thumbnails
• BGCode files (.bgcode): Binary files with embedded PNG or QOI images
• Works with files exported from PrusaSlicer

How It Works

The application searches for embedded preview images in two ways:

1. G-code Format: Looks for base64-encoded thumbnails in comment blocks (; thumbnail begin / ; thumbnail end)
2. BGCode Format: Scans binary data for PNG signatures and QOI image headers

All processing happens in your browser - your files never leave your computer.

Technical Details

• Pure HTML/CSS/JavaScript - no dependencies
• Includes QOI image decoder
• PNG detection using magic bytes (89 50 4E 47)
• QOI detection using magic bytes (71 6F 69 66)
• Canvas-based QOI to PNG conversion

License

This project is provided as-is.