# Update an Existing PDF Document

**URL:** <https://www.ruby-forum.com/t/update-an-existing-pdf-document/149824>\
**Category:** Rails\
**Created:** [September 30, 2008, 9:51am UTC](https://www.ruby-forum.com/t/update-an-existing-pdf-document/149824 "2008-09-30T09:51:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Walter\_Lockhart](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/ba8739/32.png) [@Walter\_Lockhart](https://www.ruby-forum.com/u/Walter_Lockhart)\
**Post date:** [September 30, 2008, 9:51am UTC](https://www.ruby-forum.com/t/update-an-existing-pdf-document/149824/1 "2008-09-30T09:51:10Z")

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Hi Group,

would someone please direct me to a Rails GEM | Plugin that would  
enable me to update an existing PDF document.

I am attempting to complete a PDF document (actually a HM Revenue &  
Customs form) from data in a MySQL database.

All that I have seen so far are examples of generating a PDF document  
from scratch. Is there anything out there that would enable me to  
open an existing document and maybe update fields in the PDF document?

Thanks in advance.

Kind Regards

Walter