Kindle PDF Optimization Service

What it is?

I’m fond of reading academic things on my Kindle, however, most academic papers are not designed to be read on a 6-inch size screen, let alone those with two columns format.

I took two days writing a service and now things go easy. You can just send your pdf to with your Amazon Kindle push service email address as subject, then a cropped version of your book will be pushed to your Kindle automatically. Notice that the email address you used to send email to should also have permissions to push books to your Kindle directly.

Basically, this service will crop your book into a Kindle-readable format on server and send it pretending it is you sending the book by mocking the email address.

Page selection if file too large

One thing is that if the book contains too many pages, the mailer may reject sending the attachment for its huge size, but you can enter a subset of pages (e.g. 1-9,13,209-) in the email content to shrink the result file size. The input format is:

  • Single Page - e.g. 1
  • Some Pages - e.g. 5-9
  • Page Since - e.g. 10-

And use comma , to combine the page selections, e.g. 1,5-9,10-, with a prepending # to indicate it’s a page selection command. There should not be any spaces inside the page selection.

Additional params

Currently, this service supports params including page selection and raw k2pdfopt params by writing them in mail body. Only one PDF file should be attached if params are used.

Detailed grammar:

  • Prepending # with a space to do page selection, e.g. # 1,5-9,10- (from the above example).
  • Prepending @ with a space to do pass raw params to k2pdfopt, e.g. @ -p 1,5-9,10- is same as # 1,5-9,10- if you know the param -p is page selection for k2pdfopt, resulting in k2pdfopt -p 1,5-9,10- -o <filename>_converted.pdf <filename> be called (if you know how to use k2pdfopt, then you will definetely understand this. Otherwise, # is enough for you).


Be careful, you should not send classified documents to this address! Although I will delete them in place on the server, the document will exist in Gmail trash for several days until Google purge the trash bin automatically. And if something goes wrong, I may replay attachments in the trash bin to debug. So please DON’T SEND CLASSIFIED or PRIVATE DOCUMENTS to me in order to keep me away from legal issues.


Great thanks to willus who provided this excellent tool to produce the kindle readable version of pdf.

Do you like the service?

It costs me several bucks to maintain the server and email sending service

I’m really appreciate it if you can offer me a cup of coffee :)

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