Erick Hitter

WordPress 3.0 introduced a native shortlinks feature, which builds URLs using query strings. This plugin converts those URLs to ones using pretty permalinks, which makes for a nicer-looking URL and improves shortlinks’ ability to be cached.
Posts and pages are supported by default, while filters make it possible to support other post types.
For example, https://example.com/?p=123 becomes https://example.com/p/123/.

ETH Simple Shortlinks

Convert WordPress's query-based shortlinks to pretty permalinks that are cacheable. https://example.com/?p=123 becomes https://example.com/p/123/.

Jeremy Herve

Use shortlinks instead of permalinks in Jetpack sharing buttons
<ul>
<li>If you haven’t set up any shortlink plugin on your site, the sharing buttons will use the default numerical permalinks</li>
<li>If you have enabled WP.me Shortlinks in Jetpack, the sharing buttons will use them</li>
<li>If you’ve installed another plugin to create custom shortlinks, the sharing buttons will use them</li>
</ul>
Important: for this plugin to work, you must activate <a href="https://wordpress.org/extend/plugins/jetpack/" rel="ugc">Jetpack</a> first, and activate the Sharing module.
This plugin is a work in progress. You can report issues <a href="https://wordpress.org/support/plugin/jetpack-shortlinks-for-sharing-buttons/" rel="ugc">here</a>, or submit a pull request <a href="https://github.com/jeherve/jp-sd-custshortlink" rel="nofollow ugc">on GitHub</a>.

Shortlinks for Jetpack sharing buttons

Use shortlinks instead of permalinks in Jetpack sharing buttons

ETH Simple Shortlinks vs Shortlinks for Jetpack sharing buttons