Calibre is best because it has a very fast command line tool: ebook-convert xx.rtf .mobi
Unfortunately it cannot deal with .doc files and it is a big bummer for me.
Of course, I can save .doc file as .rtf or .html but it takes more time and effort. Also sometimes Calibre conversion silently fails with such files. If there are pictures in the doc file, the resulting .rtf file can be very big, hundreds of megabytes. I think that Calibre runs out of memory because of it.
E-mailing to Kindle is also not a good option. 1) Sometimes it has some delay, it can even be up to 5 minutes. And if the converted mobi has some faults I have to repeat it again. Ultimately it takes too much time to wait. 2) I need a WiFi which is not always available when traveling.
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