Is there a painless way to combine/merge PDF files in Windows? I understand that pdftk will do it on Linux.
9 Answers
There are quite a few free options, as well as some good commercial ones:
Web-based (Free)
- BCL Premium PDF Merge Merge 2 PDF documents. Max 10MB/file. Limit of 20 merges/day
- MergePDF. Merge up to 10 files. Max limit of 5MB/file. (Registration required)
Desktop tools (free)
Booklet Creater. Merges files to create a booklet. Rearranges pages to that you can print and fold to create a simple booklet.
PDF Sam. Also known as "PDF Split & Merge". FOSS tool for splitting and merging PDFs. Windows & Mac. Console and GUI interfaces. On Windows, the installer by default installs Ad-Aware Security Toolbar, sets Lavasoft SecureSearch as homepage, new tabs, and default search provider.
Swift PDF. Combines multiple images (JPG, GIF, etc.) into a single PDF.
Editor's note, 5/1/2017: Swift PDF was last updated in 2006 and was compatible with Windows 95. The original link is dead and the product appears to no longer be supported. However, it is still downloadable at https://swift-pdf.en.softonic.com/
pdftk. FOSS power tool. Command line only. Windows, Mac, Linux, FreeBSD. Windows GUI versions exist, including a portable version and the official free version.
There are also a lot of commercial tools.
pdftk.exe is available for Windows as well. See here: http://www.accesspdf.com/pdftk/#packages and here: http://www.pdfhacks.com/pdftk/pdftk-1.41.exe.zip
Here is an example commandline for pdftk.exe. It merges all PDF files in the current directory into a combined one:
pdftk.exe *.pdf cat output combined.pdf
Another one:
\\myserver\c$\path\to\pdftk.exe ^
c:\path\to\input1.pdf ^
d:\path\to\input2.pdf ^
cat ^
output ^
e:\path\to\combined.pdf
Ghostscript can also combine multiple input PDFs (and PostScript files) into one output PDF:
gswin32c.exe ^
-dBATCH ^
-dNOPAUSE ^
-sDEVICE=pdfwrite ^
-sOutputFile=output.pdf ^
[...more Ghostscript CLI options as needed...] ^
input1.pdf ^
input2.pdf ^
input3.ps ^
input4.eps ^
input5.pdf
Update suggested by @sunk818
There is a GUI for pdftk named PDFTK Builder. This essentially builds a command line based on your option choices for you and executes:

My own update
Since I originally posted this answer, pdftk has undergone further developments.
- The application's name changed to PDFtk Server (the command line tool is still called
pdftk). - There is now version 2.02 available.
- The developers now offer their own GUI for Windows, called PDFtk Pro.
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You can use PDFill PDF Tools to perform lots of manipulations on your PDFs for free.
Use the "Merge PDF Files" button (button #1) in the screenshot below.

I found the best for me: PDF Split and Merge

PDF Split and Merge tool is implemented using the PdfSharp library and is either GUI or command driven.It is useful for automated document creation.It allows bookmarks from the input pdfs to be imported and flexibly embedded in the destination document.
It just merges or splits PDF files, nothing else.
PDF Creator will do the trick -- you can print multiple documents to a single PDF. Relatively painless :)
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Also this program named pdfbinder proved to be useful. It has a simple commandline interface for input and uses the same engine as the PDF Split and Merge already mentioned.
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I know that you can do this with Adobe Acrobat. I assume that you don't want to pay for this if it's the only use you have. You highlight your PDF files, right-click and select Combine files in Acrobat...:

Ghostscript, available on Linux and Windows, should be able to concatenate them, but it uses complicated command-line functions. You can use CutePDF, which has a free version, but I believe the Professional (paid) version is the only one that will concatenate.
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This little app I found with a Google search let me merge image files into a single PDF, which it didn't look like some of these options would. It's very limited, but it did the trick for me just now.
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