In order to save time on converting files to PDF, the function, batch conversion is developed by converter developers. Spire Free PDF Converter is one good choice to batch convert files (including Word, Excel, HTML, Text and All Image Formats) to PDF. How to Batch Convert Files to PDF? Download Spire Free PDF Converter here, install and run the application. Then, the following screenshot is displayed. More about this free PDF converter can be consulted here.