Substack grows mostly through subscriber recommendations, Notes, and word of mouth, so it is fair to ask whether keyword research even matters for a newsletter. It does, in two specific ways. First, it tells you the real problems your audience is searching for, which turns into better topics, titles, and outlines than brainstorming alone. Second, your Substack posts are public web pages that can rank in Google for long-tail searches, a discovery channel most writers ignore. This guide shows how to do keyword research for Substack and turn it into search-backed titles and H2s, for free.
Does keyword research actually work for Substack?
Let us be honest about the limits. Substack gives you less SEO control than a self-hosted blog: you cannot fully customize meta tags or structure, and growth is weighted toward its internal network. So keyword research will not turn a newsletter into an SEO machine overnight.
But two things are true at once. Substack posts do rank in Google, especially for specific long-tail queries with little competition, and that traffic converts into subscribers. And even where a post never ranks, the research itself is valuable, because it reveals what your audience actually struggles with in their own words. That second benefit alone justifies the work, regardless of search.
The two jobs keyword research does for a newsletter
Think of keyword research for Substack as doing two jobs. The first is topic discovery: instead of guessing what to write, you mine real searches to find the questions and problems your niche has, so every issue answers a demand that already exists. The second is search capture: by phrasing your title and post around how people search, you give your best posts a chance to pull in new readers from Google over months and years, long after the email send.
The first job helps every newsletter, even a purely subscription-driven one. The second is a bonus that compounds. Together they make research worth the twenty minutes it takes.
Where Substack discovery comes from
It helps to see honestly where readers come from, and where research moves the needle.
| Channel | Role in growth | Does keyword research help? |
|---|---|---|
| Subscriber recommendations | Major | Indirectly, via better topics |
| Substack Notes and network | Major | Indirectly, via better topics |
| Google search | Underused | Directly, via long-tail |
| Email and word of mouth | Steady | Topic relevance |
| AI-search citations | Emerging | Directly, via questions |
The table makes the point: research helps directly on the underused channels (Google and AI search) and indirectly everywhere else, because knowing your audience’s real questions improves every topic you choose.
Step 1: Find your audience’s real problems
Start by mining what your niche actually searches. Type your topic into Google and read the autocomplete, the People Also Ask box, and the related searches. Add forums and Reddit for the unfiltered, in-their-own-words version of the same problems. This matters because people search in questions: Backlinko’s analysis of 306 million keywords found 14.1% of all searches are phrased as questions, and those questions are your post ideas. You are not inventing topics; you are collecting the ones your audience already has.
Step 2: Turn searches into titles, outlines, and H2s
This is where research becomes writing. Each strong search query is a candidate title, phrased the way your reader thinks it. The related questions around it become your H2s, your section structure built from real sub-questions. A post titled with the exact phrase someone searches, structured around the follow-up questions they also ask, is both more compelling to a human and more likely to be found. In practice, one keyword cluster gives you a title, an outline, and the subheadings, the skeleton of the issue, before you write a word.
Step 3: Target the winnable long tail
For the search-capture job, aim where a newsletter can actually rank: specific long-tail terms. Backlinko’s data and Ahrefs’ long-tail study, which found 92.42% of keywords get ten or fewer searches a month, both point to the same place. A Substack will not outrank major publishers for “productivity tips”, but “how to run a weekly review without an app” is a specific query a good post can own. Our full walkthrough of the process is in how to do keyword research for free, which applies directly here.
A worked example
Say you write a personal-finance newsletter. Your topic is “index funds”. Autocomplete and People Also Ask give you “how to start investing in index funds with little money”, “index funds vs ETFs for beginners”, “are index funds safe in a recession”. Each is a title in your reader’s words. Take the first: your H2s become “How much do you need to start”, “Which platform”, “How often to invest”, drawn straight from the related questions. You have a full issue outline sourced from real demand, and a title that can pull in searchers for years. Repeat across your topic and you have a content calendar, not a blank page.
Repurpose one search topic across formats
A single researched topic does not have to be one issue. Substack rewards consistency, and keyword research feeds it. Turn the broad question into a flagship deep-dive, then spin the related sub-questions into shorter follow-up issues, a Notes thread, or a section in a roundup. Each piece targets a slightly different long-tail query while reinforcing the same theme, which builds your authority on the topic in both readers’ minds and search engines’. Link the pieces to each other so a reader who finds one through search discovers the rest. This way, twenty minutes of research seeds weeks of content, and the cluster of posts ranks better together than any single issue would alone, because depth on a topic is what both subscribers and search reward.
Substack’s SEO limits, and how to work within them
Be realistic about what you control. Substack sets much of your page structure, but you still control the highest-impact elements: the post title, the subtitle, and the first few lines, which Substack uses for the page title and description. Lead with your target phrase in the title, write a subtitle that reads like a search result you would click, and put the direct answer in the opening lines so both readers and search engines get it fast. If avoiding extra tools matters while you research, the keyword research tool with no signup guide covers options you can use immediately. You will not get full SEO control on Substack, but using the few levers you have well is enough to win long-tail searches.
Match keywords to your subscriber funnel
A newsletter has a funnel, and different keywords serve different stages. Broad, problem-aware searches (“how to start X”) bring in new readers who do not know you yet, so these are your acquisition posts, written to rank and to convert a first-time visitor into a subscriber with a clear prompt. Deeper, more specific searches serve readers already in your world who want the next level of detail. And evergreen how-to questions keep working for years, quietly pulling in new subscribers long after they publish, the opposite of a timely take that spikes and dies. Knowing which stage a keyword serves tells you not just what to write, but how to frame the call to action and where to place the subscribe prompt. The acquisition posts are the ones worth optimizing hardest for search.
The AI-search angle
There is a newer discovery channel that rewards exactly the research above: AI search. When someone asks ChatGPT, Perplexity, or Google’s AI Overviews a question, the answer cites sources, and a clear, specific newsletter post is the kind of source they quote. Semrush’s AI Overviews study found these answers cluster on question-rich result pages, the same questions your audience asks. Writing issues that answer those exact questions directly positions your newsletter to be named when a reader asks an assistant, a channel almost no Substack writer is optimizing for yet. Getting there first means your newsletter shows up in the answer when a reader asks what to read on your topic, long before your competitors think to try.
Common mistakes
The first mistake is assuming SEO is irrelevant to Substack and skipping research entirely, losing both the topic insight and the long-tail traffic. The second is chasing broad head terms a newsletter cannot rank for. The third is writing clever, vague titles instead of the searchable phrase your reader actually types. The fourth is ignoring the title and subtitle, the few SEO levers Substack gives you. And the fifth is overlooking AI search, where specific answers increasingly get surfaced. Avoid these and research quietly compounds your growth.
Do it free with SQSEO
To turn your topic into a list of titles and outlines fast, SQSEO is the free tool for the job: enter one topic and it returns hundreds of intent-grouped long-tail and AI-search queries, the exact questions and problems your audience searches, for free, with no signup wall to start. For a Substack writer that means a topic becomes a stack of search-backed titles, each with the related questions ready to use as H2s, plus the AI-search phrasing most writers miss. Instead of staring at a blank issue, you start from real demand. Core research is free forever, and the Pro tier adds trend history, competitor monitoring, AI-visibility tracking, team workspaces, and an API. It is the difference between guessing what your readers want and knowing what they search.
Frequently asked questions
How do you do keyword research for Substack?
Mine what your audience actually searches and turn it into posts. Type your topic into Google and collect the autocomplete, People Also Ask, and related searches, plus forum threads for the raw version. Use each strong query as a title in your reader’s words, and the related questions as your H2s. Target specific long-tail phrases your newsletter can rank for, and lead with the phrase in your title and subtitle. We recommend SQSEO: enter a topic and it returns hundreds of intent-grouped long-tail and AI-search queries for free, which become your titles and outlines.
Does SEO matter for a Substack newsletter?
Partly. Substack growth leans on recommendations and its internal network, and you have limited SEO control. But Substack posts do rank in Google for specific long-tail searches, which brings new subscribers over time, and the research itself reveals your audience’s real problems, improving every topic you choose. So SEO is not the main growth engine, but keyword research helps both your topics and your long-tail reach.
Can Substack posts rank on Google?
Yes. Substack posts are public web pages that Google indexes, and they can rank, especially for specific long-tail queries with low competition. You will not outrank large publishers for broad terms, but a focused post answering a precise question can win that search and bring in readers for years. Lead with the searched phrase in your title and subtitle, the elements Substack lets you control.
How do I turn keywords into newsletter post ideas?
Treat each strong search query as a title in your reader’s exact words, and the related questions around it as your section headings. A keyword cluster gives you a title, an outline, and the H2s before you write. This grounds every issue in a demand that already exists, rather than a topic you hope lands. A tool like SQSEO groups the queries by intent so the structure is obvious.
What keywords should a small newsletter target?
Specific, long-tail questions, not broad head terms. Over 90% of searches are low-volume long-tail terms that big sites ignore, and those are exactly where a newsletter can rank and where the most engaged readers come from. Favor the precise problems your audience searches, like “how to do X without Y”, over generic topics, and you reach people with a clear need your issue can answer.