Small but with a huge potential useful update to Google Docs. You can now export your documents in the popular .epub format. This is a new functionality available today in Google Docs.
To export a document in .EPUB format go to File > Download as > EPUB Publication (.epub).
The main advantage of EPUB files to PDF or other document formats is its ability to quickly and automatically adjust the text to different screen sizes. It allows users to change their own font size and text and accepts GIF, JPEG, PNG and SVG images.
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Image credit: Google Apps Update Blog