PDFs can be converted to the Kindle format so you can take advantage of functionality such as variable font size, annotations, and Whispersync. To have a document converted to Kindle format (.azw), the subject line should be “convert” when e-mailing a personal document to your Send-to-Kindle address.
Regarding this, can you import PDF into Kindle app?
Open the Kindle app on your Windows or Mac computer. Click File. Click Import PDF. … Your PDF file will now be readable and editable within the Kindle app.