Batch add Custom-Fields into PDF files

Dear Sirs,

I need to do the following on large amount of PDF documents. Please, find an example of what I am trying to do:

1. I have a folder that contains 50k+ PDF documents.
2. Each of those files contains already some metadata fields (custom properties?).
3. I would like to add in some automated way additional 10-15 metadata fields (created and named by me) to each of those files.
4. After adding new metadata fields I would like to update them also in an automated way with information stored in xlsx/txt/csv file.


Can I do that using any of your applications?

If you need more details about my issue please do not hesitate to ask.
I really care about getting as accurate answer as I can as your application would be potentially used in a large project.

It will run on Windows 7 Pro (32&64 bit versions).

We would like to use eventually this part of PDF document called "Custom Properties".
Is it a part of PDF's metadata?

I am sorry if my questions are imprecise but I am very new to this topic.

Thank you very much in advance for any information provided.

Best Regards,
VeryPDF Advanced PDF Tools Command Line product has this function, please download VeryPDF Advanced PDF Tools Command Line from following web page to try,

You can use following command line and options to add custom-fields into PDF files easily,

Add new information to PDF file
There are several ways to add new information like follows:
Add new custom Properties to an existing PDF file and overwrite original custom Properties,
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "key1=value1,key2=value2"
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "/key1(value1) /key2(value2)"
Append new custom Properties to an existing PDF file,
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "+key1=value1,key2=value2"
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "+/key1(value1) /key2(value2)"
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "Our Company=VeryPDF Company, Support, Our Web URL="
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "/Our#20Company(VeryPDF Company) /Support#20Email( /Our#20Web#20URL("
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -y "+/Our#20Company(VeryPDF Company) /Support#20Email( /Our#20Web#20URL("


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