There is an option in the Detailed Report section to download either the PDF or the Excel report. You can select the relevant tags or Project, a custom time-frame and then hit update, per the screenshot.
All the data of a selected project and time period will be present in the detailed report in the EXCEL format. You can download this report and edit or modify the content of the excel file as per your needs. This report also contains the sign up form responses, so is useful to filter your tool responses by demographics, i.e. for example, filter people by gender who have answered a particular survey question.
The PDF report is used to show the data in a form which is easy to understand, like in graphs and charts. So this report avoids the text submissions in tools like surveys and brainstormer which are difficult to interpret in the form of graphs.