pdf combine
The PDF combine files is all said to be free but you can't use it without paying. The accessibility to the base program is gone;
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Charles Henry commented
If you are looking for free tools to combine pdf file then there are many free PDF merger programs are available online, however some of them might not work as expected and cause a number of technical issues. Some software I've tried has given me trouble because of its confusing user interface. So using free method might risk your data and consumes time. So I would suggest you to use program like Softaken PDF Merge Tool because it is really good at combining multiple files. You can easily combine your large and oversized pdf. This program is easy to use features so anyone(technical or non-technical ) person can use this application. You can try the demo version to see how it works.
visit here:- https://www.softakensoftware.com/pdf-merger.html