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Calibre handles this very well. Plug in kindle > open calibre > go to device settings and uncheck pdf support > add books and calibre automatically converts to .mobi

Thank you :) have to try this and see.

Just email your PDF to your kindle email address with “convert” as the subject line.

https://www.amazon.com/gp/sendtokindle/email

This works, but subject is not needed, just approved From: address.

Maybe I misread the link I shared. Can you clarify:

> 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.

I read PDFs on Kindle all the time. You don't need to convert anything.

You just need to put it in landscape mode, instead of portrait, to make it readable.

I use K2pdfopt to convert scientific articles to a format (mostly) readable on my Kindle.