If you have Mac book you select each document individually and lower the size by selecting info after you right click. It’ll let you adjust the size there. After that select all the documents you want as one and combine. Then you can redo the order the documents in “view” which is another option after you right click. After that right click and turn into pdf.
I don’t have window computer so don’t know the method for that but it took me trail and tribulations to solve that out because I did not want to pay for anything or download weird third party apps. I’m sure there’s a free way to do it on windows with ta similar method
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