How to Merge PDF Files Free
The commercial version of Adobe Acrobat provides tools for merging and combining multiple PDFs. However, the full version of Acrobat is expensive for the average user. Since the PDF format is an open standard there are free alternatives to purchasing commercial software. The free program PDFsam can merge, split and re-arrange PDFs with a simple graphical interface.
Instructions
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Download the installer for PDFsam from the installer's website.
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Install PDFsam, agree to the prompts and choose the installation directory.
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Run PDFsam from the Start menu. You may encounter an error requesting a "javaw.exe" file. This error means you need to download and install Java (see Resources). Attempt to run the program again after installing Java.
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Click "Merge/Extract" from the menu on the left side of the window.
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Add PDFs to the main window by using the "Add" button on the right-hand side. You can select and add multiple PDFs at one time.
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Arrange the PDFs in the order you want them merged. In the new merged PDF, the top file will appear first followed by the ones below it. Change the file position by selecting a PDF and using the "Move up/down" buttons.
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Select a location and filename for the new merged PDF. You can type a file path into the "Destination output file" box or use the "Browse" button to the right.
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Press the "Run" button in the lower right corner of the window. Your PDFs will be merged and saved at the location you chose.
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Tips & Warnings
PDFsam also supports PDFs that include forms but you must check the "PDF documents contain forms" box under "merge options."