There is a free website called www.smallpdf.com with a multitude of options to make converting documents to the desired format a breeze.
Lets take a look.
Let start with Word to PDF. When you go to the website you will be met with this screen. You will need to click the Word to PDF button.
Once you select that option you will need to select choose file.
Then you will have to locate the file on your computer. Select the file and click open.
Once it is done converting you will have an option to download, save to dropbox, or save to drive. You will want to download the file by clicking the option like this.
The new file will then be located in your downloads folder.
You can now repeat this process for any of the other options available on the website.