The following is a step-by-step guide to restoring a damaged pdf file or document:

1. Recovery Toolbox for PDF can be downloaded, installed, and executed.
2. On the first page of Recovery Toolbox for PDF, select the damaged *.pdf file.
3. Specify the target file's name.
4. Click the Save file button after selecting the version of the PDF file to be saved.
5. now you can search and open your pdf file or document that was damaged

Read more