Step 1. Download and install ImageConverter Plus. Step 2. Select your BMP images in Windows Explorer, right-click on them, select Convert To, and then select Custom conversion. Step 3. Select JPG format and specify other settings (such as image resize) if required. BMP format produces uncompressed bitmapped images.tep 2. Select your BMP images in Windows Explorer, right-click on them, select Convert To, and then select Custom conversion. Step 3.