In a Windows OS, select the image and click on the Open option. After that, click on the File option followed by the Export As option. With this, a dialogue box will appear and under the Save as type drop-down menu, choose the JPEG file type. Lastly, click on the Save button to save your changes. Or else, you can also use free online converter tools that help you convert JPEG to JPG files. Such as Convertio and Canva.