Follow few simple steps shown as below to edit pdf in google drive:-
Step 1. First Visit Gmail official Website and use Login credentials to get logged in.
Step 2. Once you log in to your Gmail account, click on the google apps icon, which is the first icon on the top right side of your Gmail page.
Step 3 Select the option “Drive” and click on that.
Step 4. Select the PDF file or upload the PDF file which you want to edit.
Step 5. Right-click on the file and select option “open with google docs” from the drop-down menu.
Step 6. You will see your PDF open in google docs in a new tab, now you have to edit your file as per your requirement.
Step 7. Now updated PDF will be saved on Google drive or click on the file menu and select the option “Download as” and click on “PDF Document”. This will download and save your PDF file on your computer.