Step 1: Save your pdf files to your preferred location in the computer or tablet, for example, a desktop folder. Give it a name like File_to_transfer.
Step 2: Using your micro-USB cable, attach your Android device to your computer.
Step 3: Wait for your computer to initialize and display a window recognizing your micro-SD card. Sometimes Android devices require you to turn on files sharing to be recognized.
Step 4: Click on the highlighted option to open folder and view your files.
Step 5: Make a new folder or choose one of your choices to store the pdf files.
Step 6: In your computer (Desktop), find the pdf file or the eBook you wanted to transfer and then drag-and-drop the file into your preferred folder.
Step 7: Wait for the file(s) transfer to complete before you eject the SD from your computer. Your files will now be in your SD-card, and your Android device will recognize them as pdf files. To be able to read, you should have installed a pdf-reader app in your device.