OK so an update that some may find useful.
BenjiM – I’ve already got PDFSAM and it’s OK but you still have to name the merged file manually which is a pain for the volume I’m dealing with.
I also have PDFmeld command line utility from Fytek but frankly it’s a little flakey and requires you to click an OK button for every file/command line you’re working on.
So in the end I’ve stuck with command line at it can be really quick once you’ve got a system set up.
I’ve found an excellent utility called PDFtk Free which seems very fast.
Basically I’m copying the filenames of the all files that need merging using a little utility I have that allows you to select multiple files then right click and ‘copy filenames.
Filenames then pasted into wordpad.
Use AF9 Replace Some Bytes to remove CRLFs where they’re not needed to give all the files that need merging on a single line i.e.
SFO045034.PDF,SFO045034(2).PDF
SFO045033.PDF,SFO045033(2).PDF
SFO045184.PDF,SFO045184(2).PDF
SFO045147.PDF,SFO045147(2).PDF
Import this file into a FilemakerPro database (you could prob use excel) which I’ve set up to check that the filenames to be merged match, and to add various bits of extra text and then export this data as a batch file i.e.
pdftk SFO045034.PDF SFO045034(2).PDF cat output \Merged\SFO045034.PDF
pdftk SFO045033.PDF SFO045033(2).PDF cat output \Merged\SFO045033.PDF
pdftk SFO045184.PDF SFO045184(2).PDF cat output \Merged\SFO045184.PDF
pdftk SFO045147.PDF SFO045147(2).PDF cat output \Merged\SFO045147.PDF
Then run the batch file in a command prompt. PDFtk processed 100 merge processes in less than 30 seconds 🙂