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How to add a pdf to a kindle 
Convert the desired document into a pdf. 
If the file you wish to read is a document you've written or received, or other format that kindle can't read, convert the file to a pdf. Certain files can easily be converted to pdfs depending on what the original file is, such as a. Jpg, png etc.
However, word documents require a bit more work. Open the document you wish to convert to a pdf.