I think what you mean is to change the resolution of the PDF files? 'Cause I found this :
"e.g. a 300 dpi printer has "pixels" that are 1/300 inches in size, while a 72dpi monitor has 1/72 inch sized pixels. A 100x100@72dpi image on a monitor would have to be printed out at about 417x417 printer pixels to have the same apparent size (300/72 = 4.16666)"
So if it does, here is the solution:
In Adobe Acrobat, "Edit > Preferences > Convert to PDF", choose the file you want to change, select "Adobe PDF Settings > Editing > Standard" and then Edit again to change the resolution.
May this will do some help.
This depends on the DPI/PPI (dots/pixels per inch).Web image-resolution is 72 DPI.Print resolution can be anywhere between 150-300 DPI.
72 - 18 = 54 54 / 18 x100 = 300% increase
Web graphics are not displayed at a higher resolution than 72 or 96 dpi. It is a good idea to design at a higher resolution in case you want a printed piece, then do a 'save as' and reduce the resolution for the web.
To find the percentage increase from 24 to 72, you have to equate 24 to 100%. By finding out how many 24s are in 72, (72/24) you can equate that to a given number of 100%. 72/24=3 3x100 = 300. 300-100=200 Therefore, 72 is 300% of 24, but 200% more than 24. Inversely, 24 is 33.3333333% of 72, but 66.6666666% less than 72.
(72 / 300) * 100 = 24%
If your art is intended for the screen you should use 72 dpi. If you intend to print your work, you should use 300dpi
2.4 ÷ 100 × 300 = 7.2
4, remainder 12
72 is 300% of 24
The Least Common Multiple (LCM) for 72 96 300 is 7,200.
The Greatest Common Factor between 72 & 300 is 12, so (72/12) / (300/12) = 6/25
Answer= 216