After installing PDFConvert software, click Start - Programs - PDFConvert - PDFConvert to run.

Click the "PDF Tools" Toolbar, Click the "Encrypt / Decrypt PDF" button on the left, click the "Add Files" button. Browse windows will be opened, choose local PDF files (*.pdf) and click Open.

Select "Decrypt File" option if you want to remove passwords and restrictions from PDF files. Select "Encrypt File" option if you want to add passwords and restrictions to PDF files.

Click on Convert button. PDFConvert will remove user password, owner password and all the restrictions from the PDF files you selected and open the target folder after task is completed.

Continue to next step: Add Watermark to PDF