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I have many files of music; with the program mp3Tag, I had organized all of it. I have the correct metadata as it allows. I am looking for a free software that does the same, but for PDF files.

Ghostscript can insert or modify document metadata into any PDF.

Caveats: While doing so, Ghostscript will (1) first read in the complete PDF code, (2) second re-process that complete PDF code, (3) write out a completely new PDF file. This process can be wanted (could be for the advantage of the PDF quality, for example by additionally embedding previously missing fonts) or unwanted...

How to do it

1. 
   

   Create a text file named mydocinfo.pdfmark and put the following content into it:

   
   
   

   
   
   [ /Title (Jaziel's Important Document)
   
    /Author (Jaziel Aguirre)
   
    /Subject (Mr. Aguirre's experiments with pdfmark)
   
    /Creator (JA's Metadata Inserter)
   
    /Producer (A 'pdfmark' trick with Ghostscript)
   
    /DOCINFO pdfmark
   
   

   
   
   

   Note, that the opening [ does NOT require a closing ] -- it is closed by the 'pdfmark' keyword.

   
   


2. 
   

   Now run this Ghostscript command to insert the new metadata into an existing PDF:

   
   
   

   
   
   gs                     
   
     -o with-metadata.pdf 
   
     -sDEVICE=pdfwrite    
   
     existing.pdf         
   
     mydocinfo.pdfmark
   
   

   
   


3. 
   

   Check the new metadata:

   
   
   

   
   
   pdfinfo with-metadata.pdf
   
   
   
    Title:          Jaziel's Important Document
   
    Subject:        Mr. Aguirre's experiments with pdfmark
   
    Author:         Jaziel Aguirre
   
    Creator:        JA's Metadata Inserter
   
    Producer:       A 'pdfmark' trick with Ghostscript
   
    CreationDate:   Sat Dec 22 12:20:37 2018 CET
   
    ModDate:        Sat Dec 22 12:20:37 2018 CET
   
    Tagged:         no
   
    UserProperties: no
   
    Suspects:       no
   
    Form:           none
   
    JavaScript:     no
   
    Pages:          1
   
    Encrypted:      no
   
    Page size:      612 x 792 pts (letter)
   
    Page rot:       0
   
    File size:      6587 bytes
   
    Optimized:      no
   
    PDF version:    1.7
   
   

   
   

(Tested with Ghostscript v9.27.)

pdftk is a command line utility allowing you to extract and modify the PDFs metadata using the dump_data and the update_info options.

The following command will extract the metadata of the input.pdf to metadata file:

pdftk input.pdf dump_data output metadata

Modify the content of the metadata file using your text editor, then update the pdf file to a new output.pdf:

pdftk input.pdf update_info metadata output output.pdf

To check the new pdf file (print to stdout):

pdftk output.pdf dump_data