1. Run Convert Multiple Image Files To JPG Files Software.
2. Click the "Add Image File(s)" button to add files. Then an open file dialog will appear, hold CTRL or SHIFT key to select multiple files. To add all files in a folder, click "Add All Files in Folder" then select a folder.
3. Move the slider to set JPG quality.
4. To start converting the selected files, click the "Convert to JPG" button.