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Jason Yingling

Easy Footnotes lets you add footnotes throughout your WordPress posts by using the shortcode [efn_note]Footnote content.[/efn_note]. Easy Footnotes will automatically add the number of the footnote where the shortcode was entered and add the full footnote text to the bottom of your post in an ordered list with a corresponding number.
Hovering the footnote label will show the user the full text of the footnote using the jQuery Qtip2 plugin. Clicking on the footnote label will take the user down the page to the corresponding footnote at the bottom of the WordPress post. Each footnote at the bottom of the post has a icon that can be clicked to return to that particular footnote within the post copy.
That’s all it takes to start adding footnotes to your WordPress blog!

Easy Footnotes

Easy Footnotes lets you quickly and easily add footnotes throughout your WordPress posts using a simple shortcode in the text editor.

Corrado Franco

This plugin allows one to create footnotes by using markdown notation. 
It is for footnotes only. No other markdown tag is taken into account
Example:
<pre><code>I have more [^1] to say up here.

[^1]: To say down here.
</code></pre>
If used with jetpack and enabled markdown, it only shows the buttons without modifying the text content. 
Unlike jetpack-markdown, footnotes will appear in the exact point where they have been inserted. To go back to text mode click on the footnote number.
N.B 
This plugin also works with Gutenberg. But the button only appears in the Classic Editor. 
For now with Gutenberg enter the codes directly.
<h3>Configuration</h3>
No configuration is necessary.
Considering that this plugin, like others working with “markdown”, parsing the page every time I load it, I highly recommend using a caching plugin.
Customizing Footnote Layout
If you want the footnote number to be logically separated from the note (for CSS targeting) but want to prevent unwanted line breaks or extra spacing caused by WordPress’s automatic paragraphs, you can add the following CSS to your theme:
<pre><code>/* Ensure the footnote stays inline or as a specific block */
p > span.footnote {
 display: inline-block;
}

/* Remove extra spacing from the paragraph containing the footnote */
p:has(> span.footnote) {
 margin-bottom: 0;
 margin-top: 0;
 padding: 0;
}
</code></pre>

Blank Footnotes

Simple plugin to show footnotes using markdown notation.

Easy Footnotes vs Blank Footnotes