How can I merge individual selected PDF files into one PDF upon download?

Static HTML won't do it. You need something on the server side. The other answers have options that would work, I just wanted to also mention pdftk, which you could then call from the server side.Be sure to escape all file names and such, though, because you would have to use system calls.

Pdftk is really easy. The very first example from their documentation shows how to merge several PDFs, named 1. Pdf, 2.

Pdf and 3. Pdf, into one PDF called 123. Pdf: pdftk 1.

Pdf 2. Pdf 3. Pdf cat output 123.

Pdf For PHP, there even is pdftk-php, if you want to look into that.

See if itext can help in merging. A quick search gives many links - like Java: Merging multiple PDFs into a single PDF using iText. (your accept rate is low, not sure why).

I think that the Apache PDFBox project can be good for you. In particular, take a look at the PDFMerger class. You can also use iText but in my opinion it's less easy to use.

There is a Java PDF merging software at codesforus.blogspot.com/. P.s. They link to this download page: messiahpsychoanalyst.org/Documents/Downl....

You can find Source code for PDF split and Merge Source forge PDF SAM.

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