Image::ExifTool is a module for adding keywords and other searchable metadata to PDF files and various other image formats.

You can use the OO interface, or its command line utility exiftool 

    % # add keywords to a PDF
    % exiftool -keywords=perl -keywords=snoopy test.pdf
    %
    % # read them back
    % exiftool -keywords test.pdf
    Keywords                        : perl, snoopy

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In reply to Re: tagging PDFs with keywords and filtering them later by snoopy
in thread tagging PDFs with keywords and filtering them later by LanX

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