Whether on your phone or computer, your device will be able to open the cookbooks.
On a computer, the browser you are using can open PDFs.
On a phone, both Android and iOS have built in PDF readers.
To make the experience more enjoyable, you can download the free Adobe PDF reader.
The Adobe PDF reader will make reading faster and smoother. Additionally, the app provides a recently opened section which will allow you faster access to the cookbooks in the future!