suppress

Add the Table of Contents Block anywhere in your Gutenberg editor. It scans H2–H6 headings in the post content and builds a nested, clickable table of contents. Links automatically work by adding IDs to headings.
No configuration needed. Works on single posts and pages (not archives or category listings).
<ul>
<li>No theme editing required 
You can activate the plugin on any site.</li>
<li>Compatible with Gutenberg / Classic Editor 
It processes the final rendered HTML.</li>
<li>SEO-friendly 
IDs are based on sanitize_title(), the same function WP uses for slugs.</li>
<li>Works with headings that already have IDs 
It does not overwrite existing IDs.</li>
</ul>
Example: 
– Structure Your Content – Write your post or page using semantic headings (H2, H3, etc.)—just like you normally would. 
– Insert the Table of Contents Block – Add the “Table of Contents Block” anywhere in your editor (e.g., right after the introduction). 
– Let It Work Automatically – The plugin scans your headings, builds a hierarchical, scroll-linked table of contents in real time, and updates dynamically as you edit.
<h3>Key Features</h3>
<ul>
<li>Server-side generated Table of Contents</li>
<li>Automatically detects H2–H6 headings</li>
<li>Generates nested lists based on heading hierarchy</li>
<li>Automatically adds IDs to headings when missing</li>
<li>Lightweight and simple</li>
<li>Useful for:
<ul>
<li>Adding a Table of Contents to a post or page</li>
<li>Generating heading IDs</li>
<li>Linking to sections within content</li>
</ul>
</li>
</ul>
<h3>Why use this plugin?</h3>
<ul>
<li>Smart Parsing: Supports H2 through H6 headings</li>
<li>Clean Output: Uses standard HTML lists for maximum theme compatibility</li>
<li>Non-intrusive: Does not modify existing heading IDs</li>
<li>Lightweight & Fast</li>
</ul>

Supplyist TOC Block

A simple Gutenberg block that automatically generates a nested table of contents from post headings.

Arunas Liuiza

A tiny and simple to help with navigation in long texts by forming an automatic Wikipedia-like table of contents.
It works by scanning the text for headings (<code><h1>-<h6></code> HTML tags). If more than a certain amount of headings (3 by default) are found – a table of contents with bookmarks is formed and inserted to the post content. Location (above or below) the text can be chosen in settings page.
TOC is formed as HTML5 <code><nav></code> element with nested ordered list inside. No specific styling is provided, so that it fits organicaly into the text. If you need specific styling, include it to your theme’s CSS.
You can also use a shortcode – <code>[toc]</code>, template tags – <code>get_toc()</code>/<code>the_toc()</code> and a widget – <code>tinyTOC Widget</code>.
The plugin is translation ready and has Lithuanian translation.
Also try out my other plugins:
<ul>
<li><a href="http://arunas.co/cc" rel="nofollow ugc">Content Cards</a> – a plugin that makes ordinary web links great by making it possible to embed a beautiful Content Card to link to any web site.</li>
<li><a href="http://arunas.co/gust" rel="nofollow ugc">Gust</a> – a Ghost-like admin panel for WordPress, featuring Markdown based split-view editor.</li>
<li><a href="http://arunas.co/tinycoffee" rel="nofollow ugc">tinyCoffee</a> – a PayPal donations button with a twist. Ask people to treat you to a coffee/beer/etc. </li>
<li><a href="http://arunas.co/tinysocial" rel="nofollow ugc">tinySocial</a> – a plugin to display social sharing links to Facebook/Twitter/etc. via shortcodes</li>
<li><a href="http://arunas.co/tinyrelated" rel="nofollow ugc">tinyRelated</a> – a plugin to manually assign and display related posts.</li>
<li><a href="http://arunas.co/tinyip" rel="nofollow ugc">tinyIP</a> – Premium – stop WordPress users from sharing login information, force users to be logged in only from one device at a time.</li>
</ul>
An enormous amount of coffee was consumed while developing these plugins, so if you like what you get, please consider treating me to a <a href="http://arunas.co#coffee" rel="nofollow ugc">cup</a>. Or two. Or ten.
Cover image credit: <a href="https://www.flickr.com/photos/adactio/1523797880/" rel="nofollow ugc">Jeremy Keith</a>

tinyTOC

Automaticly builds a Table of Contents using headings (h1-h6) in post/page/CPT content.

Supplyist TOC Block vs tinyTOC