wkhtmltopdf: Is it possible to merge PDF files?

You can combine multiple html files to one output pdf file with this library. For e.g if u have:

my-html-file-nr-1.html
my-html-file-nr-2.html
....
my-html-file-nr-n.html

You can simply:

wkhtmltopdf my-html-file-nr-* output.pdf

wkhtmltopdf doesn't provide support for merging PDF's. You can accomplish this using GhostScript. It's a pretty powerful tool and frequently used by Linux users.

You can use the following command:

gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=out.pdf in1.pdf in2.pdf

You can try these links for further reading:

• GhostScript
• Merge PDF's using Ghostscript (Windows)

In case you want it for Linux refer

• Merge PDF's using Ghostscript (Linux)

EDIT: As stated by @nenotelp there are other tools available as well. The part that @nentelp mentioned is regarding the handling of bookmarks which is better with iText or iTextSharp. If this is your requirement you can certainly opt for other tools.

P.S. - Google Ghostscript. You will find tons of references.