With the free version of Adobe Reader, you can search multiple PDF files for keywords at the same time. Here’s how it works:
- Press the keyboard shortcut Ctrl + Shift + F to launch the Advanced Search panel.
- Select All PDF documents radio button option and then either select a drive or a folder you want to look in.
- Enter your search word or phrase
- From the checkboxes, check one or more desired options
- Click Search button to start search
It will take its due time depending upon the number of PDF files in the specified drive/folder and the content volume of the files.
