jwenl

This plugin provides support for using oEmbed in your WordPress blog.
Rick media Example: 
[oembed:http://polldaddy.com/oembed?url=http://answers.polldaddy.com/poll/2431815/&format=xml] 
This will put the selected polldady poll on your blog
Photo example Flickr: 
[oembed:http://www.flickr.com/services/oembed/?url=http://www.flickr.com/photos/23886028@N04/3983995799/in/set-72157622398187791/] 
This will put a Flickr photo into your posting.
Video example Youtube: 
[oembed:http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=yvdbqcbRH50&format=json]

oEmbedder

This plugin provides support for using oEmbed in your Wordpress blog.

Andy Fragen

Alex Kirk

Colin Stewart

Embed a PDF from the Media Library or elsewhere via oEmbed or as a block into an <code>iframe</code> tag. The URL only has to be world reachable link. Chrome uses Google Doc Viewer as Chrome seems to automatically rendered embedded JS in PDFs automatically. Uses Google Doc Viewer with mobile.
Inspired by <a href="https://wordpress.org/plugins/dirtysuds-embed-pdf/" rel="ugc">Embed PDF</a> and <a href="https://wordpress.org/plugins/rv-embed-pdf/" rel="ugc">RV Embed PDF</a>.
Many thanks to <a href="https://github.com/akirk" rel="nofollow ugc">Alex Kirk</a> for making Embed PDF Viewer compatible with the new block editor.
Development on <a href="https://github.com/afragen/embed-pdf-viewer" rel="nofollow ugc">GitHub</a>. Pull requests are welcome against the <code>develop</code> branch.
<h3>Known Issues</h3>
Occasionally Google Doc Viewer will not correctly load the PDF. Reloading the page should correct the issue, though this may need to be done several times.

Embed PDF Viewer

No settings, just add the link of the PDF on a page or use a block.

Had issue with the viewer width, but there's a simple solution for that as well, check this thread.

Thanks!

Works out of the box

Fantastic

Embed a PDF from the Media Library or elsewhere via oEmbed or as a block into an iframe tag.

oEmbedder vs Embed PDF Viewer