Kodo

Slug-Free Permalinks lets you switch selected post types and taxonomies to simple ID based permalink formats.
You can choose between:
<ul>
<li><code>/post/123/</code></li>
<li><code>/post-123/</code></li>
</ul>
The plugin only affects the post types and taxonomies you enable in the settings screen.
Features:
<ul>
<li>Select individual public post types</li>
<li>Select individual public taxonomies</li>
<li>Choose slash or hyphen based ID permalink format</li>
<li>Optionally redirect legacy slug URLs to the current ID based permalink when WordPress can resolve the request</li>
<li>Preserve prefixed permalink bases such as <code>/en/</code> when another plugin adds them</li>
<li>Flush rewrite rules automatically when settings change</li>
</ul>
This plugin is focused on permalink structure only. It does not add content features or front-end UI.
Plugin page (English): https://happas.jp/en/slug-free-permalinks/ 
Plugin page (Japanese): https://happas.jp/slug-free-permalinks/
Development repository: https://github.com/1008k/slug-free-permalinks
This plugin is best suited to new sites, sites still defining their permalink policy, or structured-content use cases where slug management is unnecessary.
If your site already has a large number of published posts and established slug based URLs, review the impact carefully before enabling it. Check existing inbound links, search traffic, social shares, and editorial workflow assumptions.
Known limitations:
<ul>
<li>If a post type slug and taxonomy slug are identical, their ID based rewrite patterns can conflict.</li>
</ul>

Slug-Free Permalinks – Simple ID-Based URLs

Use ID based permalinks for selected post types and taxonomies without managing slugs.

Pieter Bos

Chinese characters don’t come out good in permalinks. Without the Pinyin Slugs plugin activated, the example post I made for the screenshot will get a slug like this: %e6%90%9c%e7%b4%a2%e5%bc%95%e6%93%8e%e4%bc%98%e5%8c%96. With the plugin the slug automatically becomes sousuoyinqingyouhua.
Search engines such as <a href="https://www.baidu.com" rel="nofollow ugc">Baidu</a> cannot make much of the first slug, but they can handle pinyin perfectly, especially when it is written as one long string without hyphens or underscores.
It is possible to limit the amount of characters in the slug. The default is 100, which should be plenty for most.
The Pinyin Slugs plugin was forked from the <a href="https://wordpress.org/plugins/pinyin-permalink/" rel="ugc">Pinyin Permalinks</a> plugin by user <a href="https://profiles.wordpress.org/xiaole_tao/" rel="nofollow ugc">xiaole_tao</a> as that project seemed abandoned. There have been many improvements since; read the changelog for details.
I have decided to only support this plugin through <a href="https://github.com/senlin/pinyin-slugs/issues" rel="nofollow ugc">Github</a>. Therefore, if you have any questions, need help and/or want to make a feature request, please open an issue over at Github. You can also browse through open and closed issues to find what you are looking for and perhaps even help others.
PLEASE DO NOT POST YOUR ISSUES VIA THE WORDPRESS FORUMS
Thanks for your understanding and cooperation.
<h4>WPML Compatible</h4>
The Pinyin Slugs plugin has received the <a href="https://wpml.org/plugin/pinyin-slugs/" rel="nofollow ugc">WPML Certification of Compatibility</a> and is featured on the WPML website with the article <a href="https://wpml.org/documentation/how-to-build-a-wordpress-site-in-china/" rel="nofollow ugc">How to Build a WordPress Website in China and Reach an International Audience</a>.

Pinyin Slugs

Transforms Simplified or Traditional Chinese character titles into Pinyin to create a permalink friendly slug.

Slug-Free Permalinks – Simple ID-Based URLs vs Pinyin Slugs