Portable document format (PDF) was developed by Adobe and released in 1992. However, Acrobat, Adobe's PDF editing program, wasn't released until 1993. Since then, numerous changes to the program have increased the number of things you can do with a PDF file. The ability to split a PDF file in half can come in handy when you have a large file and more than one person editing or reviewing separate parts. You can split a PDF file in half without modifying your original.
Double-click on the PDF you want to split in half to open Adobe Acrobat and the document itself.
Click "Document" and then "Split Document" in the top menu bar.
Select "Number of Pages" and set the number of pages to half (or as close to half as possible) of the total number of pages in your PDF.
Click "OK" at the bottom of the Split Document interface.
Click "OK" on the confirmation window. Your new documents will be saved in the same location as your original and the title will be the same followed by "_part 1" and "_part2."
Rename your documents as necessary.
To find the total number of pages of a document, look at the second level menu bar at the number in a white box followed by a slash and another number. The second number is your total pages.