much more powerful merge / manipulate functionality for files

(‘Free Online PDF and Document Tools’)
(in particular: merge / join a set of pdf files)
Here is the link.
keywords:
[pdf merge]
[merge pdf]
[pdf combine]
[combine pdf]
[pdf join]
[join pdf]
[pdf organize]
[organize pdf]
[pdf split]
[split pdf]
]pdf manage]
[manage pdf]
[Information Technology]
[cyber space]
[cyberspace]
[user-friendliness]