How Do You Add a Sticky Table of Contents to Long Webflow Blog Posts in 2026?

Why Do My Longest Webflow Posts Lose Readers Halfway Down?

I publish long. Many of my Webflow guides run past 1,800 words, and for years my longest posts had the worst scroll depth. A client once told me my pricing guide was great but she gave up before the part she actually needed. The content was fine. The problem was that nobody could see the shape of the page or jump to the part that mattered.

That is the job a table of contents does. It shows the reader the whole map at a glance and lets them jump straight to their question. Nielsen Norman Group research has long found that people read at most 20 to 28 percent of the words on a page, so giving them a fast path to the right section is not a nicety. It is survival for long content.

In this tutorial I will walk through how I add a sticky table of contents to long Webflow blog posts, the kind that follows you down the page as you scroll. I will cover the build, the sticky behavior, the mobile version, and how to tell if it is helping.

What Is a Sticky Table of Contents and Why Add One in 2026?

A sticky table of contents is a list of a post's headings, usually in a sidebar, that stays visible as the reader scrolls. Each item is a jump link to a section. It gives readers a map of the page and one-click access to any part, which keeps long posts usable instead of intimidating.

In 2026 it does double duty. Readers get faster navigation, and search and AI systems get a clear outline of your page structure. When your headings are real questions with clean anchors, tools that scan your page understand it better, which supports the answer-first approach I rely on for AI citations.

I add one to any post over about 1,200 words. Backlinko's content research has repeatedly found that long-form articles earn more links and shares, but length only pays off if people can actually move through it. The table of contents is what turns a long page from a wall into a guided tour.

Does a Table of Contents Actually Help SEO and AI Citations?

Yes, in two ways. It improves engagement signals like scroll depth and time on page, because readers find their answer instead of bouncing. It also gives crawlers and AI models a clean, linked outline of your content, which helps them map your sections to the questions people ask.

This matters more now that systems like GPT-5.4 fan out a single question into many smaller queries. A page with clear, question-shaped sections maps neatly onto those sub-questions, which I explored in my piece on query fan-out and blog structure. A table of contents makes that structure visible to both people and machines.

How Do You Build the Table of Contents in Webflow?

The cleanest way is a small script that reads every H2 in your rich text element, gives each one a unique ID, and builds a list of links pointing to those IDs. You drop an empty container where you want the table of contents, and the script fills it when the page loads. No manual anchor editing required.

The reason you need a script is that Webflow's CMS rich text does not add IDs to headings automatically. So the script loops through the headings, turns each heading's text into a slug for the ID, and writes both the ID onto the heading and a matching link into your table of contents box. Every post then gets a correct table of contents with zero manual work.

I keep this script in the blog post template's footer code so it runs on every article. Because it reads the live headings, it updates itself whenever I add or rename a section. I write the post, and the table of contents simply appears, which is exactly the kind of automation that scales across hundreds of posts.

How Do You Make It Stick as Readers Scroll?

Use CSS position sticky on the table of contents wrapper with a top value that clears your navigation bar. Put the table of contents in one column and the article in another, and the sticky column will follow the reader down until the article ends. It is a few lines of CSS, no JavaScript needed for the sticky part.

One detail trips everyone up. When you click a jump link, the section can hide behind a sticky header. The fix is scroll-margin-top on your headings, set to the height of your nav plus a little breathing room. Add smooth scroll behavior on the page and the jumps glide instead of snapping, which feels far more polished.

Should You Use Finsweet or Write Your Own Script?

Both work. Finsweet offers a popular table of contents tool that handles ID generation and active states with almost no code, which is great if you want a tested solution fast. Writing your own script gives you full control and removes a dependency, which I prefer for sites I maintain long term.

My rule is simple. If a client wants something I can hand off and never touch again, I reach for Finsweet because it is documented and supported. If it is my own site or a site where I control the code, I write the fifteen-line script so there is nothing external to break. Either path gets you a working, automatic table of contents.

But What About Mobile, Where There Is No Sidebar?

On mobile, hide the sticky sidebar and show the table of contents as a collapsible block near the top of the post instead. Readers tap to open the list, jump to a section, and keep reading. A sticky sidebar makes no sense on a narrow screen, so you change the pattern, not the feature.

I build the mobile version as a simple open and close panel using the native details and summary elements, which need no JavaScript and are accessible by default. It sits right under the intro, so phone readers get the same map without losing precious screen space. Most of my blog traffic is mobile, so I treat this version as the main one, not an afterthought.

How Do You Know the Table of Contents Is Working?

Watch scroll depth, time on page, and clicks on the table of contents links. If average scroll depth rises and people are clicking the jump links, the feature is earning its place. In analytics I tag the table of contents links so I can see exactly which sections readers reach for most.

Those click numbers also tell me what to write next. If everyone jumps to one section, that question deserves its own post. The table of contents quietly becomes a research tool, showing me which parts of a topic readers care about, which feeds my whole content plan for the months ahead.

How to Add This to Your Blog This Week

Here is the order. First, add an empty table of contents container and the heading script to your blog post template. Second, set the two-column layout with position sticky and a sensible top offset. Third, add scroll-margin-top to your headings and smooth scrolling. Fourth, build the collapsible mobile version and tag the links so you can measure clicks.

For related building blocks, my tutorial on adding breadcrumbs to a Webflow CMS blog improves navigation further, my piece on query fan-out and blog structure explains why question-shaped sections matter, and my guide on a scroll-driven reading progress bar pairs perfectly with a sticky table of contents. Use them together and long posts stop scaring readers away.

A good table of contents is one of the highest-return things you can add to a content-heavy Webflow site. It takes an afternoon and pays off on every long post you have ever published. If you want help setting it up across your blog, I am happy to walk through it. Let's chat.