Akaal Creatives

Saral PDF Preview lets you attach a PDF file to any WooCommerce product. A configurable button appears on the product page and opens the PDF in a clean, distraction-free lightbox — no download, no print, just a smooth in-browser reading experience powered by PDF.js.
Features
<ul>
<li>Upload a PDF per product via a dedicated meta box in the product editor.</li>
<li>Configurable button text (default: “Preview Book”).</li>
<li>Choose from 7 hook locations on the product page — a live visual diagram shows exactly where the button will appear.</li>
<li>Protected mode (default): the real PDF URL is never exposed to visitors; the file is streamed through a signed REST endpoint.</li>
<li>Public mode: uses the standard WordPress attachment URL.</li>
<li>Zoom in / zoom out controls inside the lightbox.</li>
<li>Keyboard accessible — press Escape to close.</li>
<li>Responsive layout on mobile.</li>
<li>No tracking, no external requests, no upsells.</li>
</ul>

Saral PDF Preview for WooCommerce

Add a PDF preview button to WooCommerce product pages. Customers can view a PDF sample in a lightbox without downloading.

filipstepanov

This is simple and lightweight plugin for WP. It works similar to Facebook’s url preview and it’s very easy to use.
Plugin uses free LinkPreview API web-service at http://www.linkpreview.net and retrieves basic link SEO data.
Additionally, in dashboard plugin settings you can avoid using API and scrap the link information directly from local web server using CURL or file_get_contents.
All the link info retrieved can be stored in cache to avoid possible performance impact on high traffic websites. Aside other plugin’s settings in dashboard, there is Cache time value where you can specify in minutes how long to keep URL’s information for future use.
Both LTR and RTL content environments are supported.
Two different plugin features are at your disposal, tooltips and shortcode:
Tooltip
Tooltip feature hooks on content load and scans for possible link matches. Each link matched is being modified with additional attributes, so when you hover them, popup is shown.
It’s using plugin’s JavaScript and WordPress Ajax to deliver content on demand.
Shortcode
When used through shortcodes it works the same way, just no hover needed but static content like Facebook’s URL preview will be shown.
Shortcode usage example:
[link_preview]http://…[/link_preview]

Phee's LinkPreview

Preview basic SEO link info before clicking it

Saral PDF Preview for WooCommerce vs Phee's LinkPreview