nicmare

Did you know that WordPress generates a thumbnail image file when uploading a PDF-file? This works when the PHP Extension imagick and Ghostscript is available! It won’t work with GD library! You know they are present and it’s working, when you upload a PDF-file in the media library and you immediately see a thumbnail of the file. Now that thumbnails are available my plugin hooks into the Gutenberg file-block to automagically inserting that thumbnail right before the file block. Besides that it also provides some more options:
<h3>Plugin Features</h3>
✔ a toggle to insert an preview image before the file block 
✔ a toggle to link the preview image with the “link to” settings value of the file block 
✔ a toggle to link the preview image with itself to the full-size image 
✔ a toggle to enable the Lightbox-Effect on the preview image (enable in settings) 
✔ a setting to choose the size of the preview image: thumbnail, medium, large 
✔ a settings page to define default for image size and <code>show inline embed</code> default value and a <code>height in pixels</code> default value 
✔ when activating the plugin, the <code>show inline embed</code> option of the file block gets disabled by default 
✔ the preview image link target is based on setting of file-block (<code>open in new tab</code>) 
✔ adds new block styles to file block with just a few inline css code 
✔ this plugins main goal is to be very lightweight and avoid loading any additional assets and saving DOM performance. It just uses 3 files.
This plugin requires imagick and Ghostscript! A good WordPress web hosting has it installed by default.

PDF-Preview inside File-Block

Extends the core/file block to optionally insert a PDF preview image (generated by WordPress) before the file block and adds linking/lightbox options.

PDF-Preview inside File-Block vs Iptanus File Upload