To convert a document from a PDF-format to a plain text format, you would need to use some professional PDF-converting tools. Here are some steps that might be useful: 1. Downloading and installing a file conversion tool. There are many online and offline tools to choose from, such as PDFelement, Android Acrobat, Inkscape, etc. 2 Open the file in your browser and use the "export" option in the file conversion tool to export the file as a plain text file. 3 When you export a plain text file, you can choose to copy all the contents of the PDF-file into a plain text file or use the "extract content" option in the PDF-conversion tool to extract the contents of the PDF-file. 4. edit the extracted plain text file content to convert the PDF-format into plain text format. It is important to note that there may be some problems during the conversion process, such as errors in the format of the file, inability to convert the content, etc. Therefore, it is best to scan or manually edit the PDF-file before converting it to PDF-files to ensure the accuracy and integrity of the file.