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This is quite similar to what is being asked in this post, but the post does not seem to work for GitHub's parsed Markdown.

Simply put, let us say I have a PDF in a GitHub repository. Is there any way to render/embed that in a markdown file that is in the repository (e.g. the README.md file)?

I would also be open to having the PDF in a location other than GitHub and linking to it from the markdown file if that is what is required to make this work.

Answers

Currently there is no way to preview a pdf in github markdown, however you can embed an image of the pdf.

Edit
From here:

The best you can do is a greasemonkey extension which would allow you to call a pdf viewer, like the recent pdf.js (a Portable Document Format (PDF) viewer that is built with HTML5.), allowing you to view a pdf entirely online, without any pdf plugin installed.