Somehow I feel it's quite difficult to read through many pages of PDF using my small display of MacBook. Fortunately, I come out with several ideas to improve the readability of reading PDF files with Preview which is our Mac default application to view PDF files.
Perhaps you haven't set up your default opening application for PDF file to Preview, you can do the following steps :
Open Withwith modifier keys Option pressed. You should notice that the name is now changed to Always Open With
For big monitor's owner, the view area wouldn't be much of trouble for you that you can easily right-click on the display area and choose Automatically Resize. This will make your previewed page automatically zoomed to fit the entire view pane with its height and width proportional to the initial size.
Because the entire page is displayed on the view pane, you can easily jump to next page using your mouse-scroll or pressing Down-Arrow key.
Problem arises when you need to view your long PDF File using small display of your MacBook. Suitable view will result it your Preview to have scroll bar on the right side of its view pane which causes the mouse-scroll and down-arrow key cannot be used to change to next page.
Luckily, you can use Right-Arrow key instead. This can be used to switch to next page successfully. Note that using mouse-scroll or Down-Arrow can also change page but you're required to hit the end of page first.
Hopefully, now you can get the convenient display and navigate easily. You can use Command [+] / Command [-] to zoom in/out followed by pressing the Zoom button (green button at top left corner of the pane) to adjust your view.
When you have hundreds pages of file, it will be really tedious to scroll down page by page to let say you want to reach page 145. You can use Go to Page.. (keystrokes: Command-Option-G) which is located under Apple ▸ Go ▸ Go to Page... Putting in the page number you want to look for and you'll be taken to the specified page.
Some articles taken from our resource base, tightly related to current article, to empower you with more knowledge on tweaking the most out of your Mac.