ImgConvert is an add-on utility allowing to convert raster images to internal Autodesk® AutoCAD® blocks. So you can embed attached (external) raster images into your DWG drawings - the resulting DWG file will no more depend on external references. Both monochrome and color images are supported, in any raster file format. There is a penalty in file size - larger images may grow your DWG files substantially. ImgConvert also contains tools to draw and embed QR Codes (2D matrix bar codes) in your DWGs.
Trial version of ImgConvert limits (crops) the size of images higher than about 64 pixels. QR Codes from IMGQRCODE are displayed at any size but the trial version limits the number encoded characters to 64.