With Wondershare PDFelement, you're able to combine multiple files, like images, Microsoft Word documents, Excel worksheets, text, into a single PDF file.
In the Convert tab, you can see the option of Combine files. Click it and in the pop-up, you're able to drag and drop files directly to the window or click the Add Files button to browse your computer for the files. After adding files into the window, drag the files respectively to arrange the order. When it is done, click the Next button to merge these files into a single PDF document.