online pdf combiner
Choose Tools > Organize Pages
Follow steps 4 through 8 in the procedure for adding headers and footers with an open documentWhen you have finished setting up your headers and footers, click OK
In the Output Options dialog box, specify your folder and filename preferences and click OKUpdate the headers and footers Updating applies to the most recently added header and footer setOpen the PDF file containing header and footer
Choose Tools > Edit PDFIn the secondary toolbar, choose Header & Footer > Update
Change the settings as needed
Add another header and footer Open the PDF file containing header and footerDrag the center of the box to pan across the area you want to see
Click the navigation buttons to move to a different pageEnter a value in the zoom text box, or click the plus or minus buttons to increase or decrease the magnification by preset levels
Change the magnification with the Loupe tool Choose View > Zoom> Loupe ToolClick the area of the document you want to view in closer detail
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Source:combine pdf files