If your PDF file while converting doesn't completely convert and you are unable to upload it to any drive, then you will need to flatten the PDF files. When you flatten a PDF file while submitting your PDF forms, you can be sure that no one else will be able to edit the file or change the content. Now, the only way to flatten the files is to get a software that can successfully flatten the PDF file and convert it. You can look for âPDFElement 7â on the internet and download the software. Here, you can save time by just following some steps to flatten your important PDF files and send it to anyone safely. In order to know the steps of how to flatten PDF files, watch the video given below.