scan multiple pages into 1 pdf

If using Apple Image Capture see:

http://superuser.com/questions/93396/how-can-i-scan-multiple-pages-into-a-single -pdf

Do it this way:

• Make sure your scanner is installed properly
• Place the first page under your scanner
• Hit command-space
• Enter "Image Capture"
• Press Enter
• Now the application "Image Capture" is started
• Select your scanner in the left bar
• Click the "Show Details" button on the bottom of the window
• Change the "Format" field to "PDF"
• Now the "Combine into single document" checkbox appears
• Enable that checkbox
• Now click "Scan" for each page you want to add
• When you are done you can close "Image Caputer"
• The scanned document will be in your "Pictures" directory, or in an other dir you selected.

I use Image Capture frequently in that way.

If you already have the separate PDFs:

Open Finder on the folder containing your PDFs

Open the first page in Preview,

Select Thumbnails view (top left icon)

Drag the other PDFs to the foot of the thumbnails sidebar - they should be added to the first PDF

File/Save the combined file