Quote:
Originally Posted by Elfwreck
You can't embed a PDF in an epub.
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Actually, you can embed a PDF in an ePUB. You can embed practically anything in an ePUB, the problem is there is no guaranty at all that any reading system will know what to do it, and you should provide a fallback for the (likely) case that the reader does not support the embedded content.
In the case of PDF, you can include a PDF file in the manifest, and link to it in the text, but you must include some fallback XHTML file to be used when the PDF is not supported. Even when the reader supports PDF, don't expect it to be opened in a nice user-friendly environment, it will probably be opened as a full page inside the ePUB viewer, with the same options as with any illustrations (usually no zoom, etc.)
If you want the user to be able to pan, zoom, rotate, etc. an image, that's a feature of the reading software, not something you can include or not in your ePUB.