To read a long PDF document, Adobe Reader has an automatic scroll function to avoid having to go through the keyboard or mouse to change the page. You can adjust the scrolling speed to your reading speed.

1. In Adobe Reader, open the PDF document you want to read.


2. After that Click the View menu on top of the Toolbar.


3. There you will have to click on "Automatically Scroll" option in the given list.

4. The paper begins to slowly scroll down. Press the Up Arrow or Down arrow key to slow down or speed up the scrolling.

5. To reverse the direction of scrolling, repeatedly press the up arrow to slow down and change the direction of scrolling. You can return to the normal direction by doing the same with the down arrow.