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.

Themeisle

webcraftic

Note: This plugin is no longer being actively developed, and we recommend switching to <a href="https://wordpress.org/plugins/cyrlitera/" rel="ugc">Cyrlitera</a>, a more advanced version with expanded features and customization options.
Transliteration is the process of converting characters from one writing system to another, such as converting Cyrillic symbols to Latin. Because most web software and URLs are designed around Latin characters, using Cyrillic or other non-Latin symbols in links or file names can lead to unreadable URLs, accessibility issues, and even broken links. Transliteration ensures your URLs and file names remain clean, readable, and compatible across all platforms.
This plugin automatically replaces Cyrillic, Georgian, Turkish, and other supported characters with Latin equivalents to create clean and readable URLs for posts, categories, taxonomies, products, and custom post types. It also fixes incorrect file names by removing unsafe characters and transliterating them during upload, helping prevent 404 errors and broken media links.
<h3>Examples</h3>
Cyrillic URL before transliteration:
<pre><code>https://example.com/%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D1%82-%D0%BC%D0%B8%D1%80
</code></pre>
Same URL transliterated to Latin:
<pre><code>https://example.com/privet-mir
</code></pre>
Incorrect file names before transliteration:
<pre><code>%D0%BC%D0%BE%D0%B5_image_290.jpg
A+nice+picture.png
</code></pre>
Readable transliterated file names:
<pre><code>moe_image_290.jpg
a-nice-picture.png
</code></pre>
By using Latin-based file names and URLs, you avoid issues with encoding, broken links, and unreadable paths. This plugin performs the transliteration automatically each time a file is uploaded, ensuring your media library stays clean and consistent.
<h3>Features</h3>
<ul>
<li>Automatically transliterates URLs for posts, pages, categories, tags, and custom post types</li>
<li>Preserves existing URL structure while making it readable</li>
<li>Transliterates attachment file names</li>
<li>Removes unsafe or problematic characters from file names</li>
<li>Supports Russian, Belarusian, Ukrainian, Bulgarian, Georgian, Greek, Armenian, and Serbian character sets</li>
<li>Compatible with Advanced Custom Fields, Asgaros Forum, and BuddyPress</li>
</ul>
<h3>Advanced Transliteration Features</h3>
If you need more advanced transliteration features, consider upgrading to <a href="https://wordpress.org/plugins/cyrlitera/" rel="ugc">Cyrlitera</a>.
Unlike Cyr to Lat Reloaded, Cyrlitera offers a user-friendly interface that gives you full control over how links are transliterated. It also allows you to roll back converted URLs, create automatic redirects from old URLs to new ones, and help eliminate broken links across your site.

Cyr to Lat Reloaded – Transliteration of Links and File Names

I got a lot of 404 pages, and I don't know how to restore old URL

Plugin is change old permalink for all posts

Convert Cyrillic, Georgian and Greek URLs and file names to readable Latin characters. Works on slugs, attachments and taxonomies — no code needed.

Slug-Free Permalinks – Simple ID-Based URLs vs Cyr to Lat Reloaded – Transliteration of Links and File Names