If you have been writing content for a while and still struggling to rank on Google’s first page, there is a good chance you are missing something that most beginners overlook entirely — LSI keywords.
I remember the first time I heard this term. I was sitting at my desk in London, staring at a blog post I had spent three days writing. It was well-researched, beautifully formatted, and completely ignored by Google. A colleague leaned over and said, “Have you thought about your LSI keywords?”
I had not. I did not even know what they were.
That conversation changed how I write content forever. And in this guide, I am going to share everything I now know about LSI keywords — what they are, why they matter, and exactly how to use them to rank higher on Google.
What Are LSI Keywords (And Why Should You Care)?
LSI stands for Latent Semantic Indexing. It sounds technical, but the idea is beautifully simple.
LSI keywords are words and phrases that are naturally related to your main keyword. They are the terms that tend to appear together in the same piece of content because they belong to the same topic.
For example, if your main keyword is “coffee,” LSI keywords might include:
- Espresso
- Caffeine
- Brewing methods
- Coffee beans
- Arabica
- French press
- Morning routine
These words are not synonyms for coffee. They are simply words that tend to live in the same neighbourhood as the word “coffee.” Google has learned, over billions of web pages, that when all these words appear together, the content is genuinely about coffee — not just repeating the word “coffee” over and over.
This distinction is everything.
Why Google Cares About LSI Keywords
Back in the early days of the internet, Google ranked pages based heavily on keyword density — how many times a word appeared on a page. Website owners quickly figured this out and started stuffing their pages with keywords, sometimes to a ridiculous degree.
Google got smarter.
Today, Google uses sophisticated natural language processing to understand context and meaning, not just individual words. It wants to serve its users the most relevant, most comprehensive, most trustworthy content available. LSI keywords are one of the signals it uses to figure out whether a page is genuinely covering a topic deeply — or just gaming the system.
When you use LSI keywords naturally throughout your content, you are essentially telling Google:
“Yes, I really know what I am talking about. My content covers this topic properly.”
And Google rewards that with higher rankings.
The Real Difference Between Keyword Stuffing and LSI Keywords
Let me paint two pictures for you.
Writer A is told to rank for “best running shoes.” They write 1,500 words and use the phrase “best running shoes” 47 times. The article feels robotic. It does not mention cushioning, pronation, trail running, marathon training, or any of the terms a real runner would expect to read.
Writer B also wants to rank for “best running shoes.” But they write naturally about what runners actually care about — heel drop, breathability, grip, arch support, durability, and different shoe types for different runners. They mention brands, running surfaces, and how to find the right fit. The phrase “best running shoes” appears about 8 times, but the article is genuinely helpful.
Which one do you think Google ranks higher?
Writer B, every single time. Because Writer B used LSI keywords naturally. They covered the topic the way a real expert would.
How to Find LSI Keywords (Free and Paid Methods)
Finding LSI keywords is easier than you think. Here are the most reliable methods, starting with completely free options.
1. Google’s Autocomplete Feature
Start typing your main keyword into Google’s search bar and stop before pressing Enter. Google will suggest a list of related searches. These are gold. They are real queries from real people, which means Google already associates them with your topic.
For example, type “home workouts” and Google might suggest:
- Home workouts for beginners
- Home workouts without equipment
- Home workouts to lose weight
- Home workouts for women
Each of those suggestions is a potential LSI keyword to weave into your content.
2. “People Also Ask” and “Related Searches”
Scroll to the bottom of any Google search results page and you will find a section called “Related Searches.” These are closely related topics that Google associates with your keyword. Every single one of those suggestions is an LSI keyword opportunity.
Similarly, the “People Also Ask” boxes that appear in the middle of search results show you the exact questions real users are asking about your topic. Answer those questions within your article and you are speaking Google’s language.
3. LSIGraph
LSIGraph (lsigraph.com) is a free tool built specifically for finding LSI keywords. Enter your main keyword and it generates a long list of semantically related terms. It is not perfect, but it is fast and useful for getting ideas quickly.
4. Google Keyword Planner
Google’s own Keyword Planner, available free through Google Ads, shows related keyword ideas when you enter a seed keyword. Look for terms that share thematic ground with your main keyword — these are your LSI targets.
5. Ahrefs and SEMrush
If you use paid SEO tools, both Ahrefs and SEMrush have keyword explorer features that show you related terms, semantically similar keywords, and topic clusters. These are more powerful but not necessary if you are just starting out.
6. Read the Top-Ranking Pages
This is my personal favourite method. Take the top three to five pages already ranking for your keyword and read them carefully. Make a list of words, phrases, and subtopics that appear frequently. These are the LSI keywords Google is already associating with that topic. If those pages rank, it is partly because they use those terms naturally.
How to Use LSI Keywords in Your Content
Finding LSI keywords is just step one. Using them properly is where most people go wrong. Here is how to do it right.
Use Them Naturally — Never Forced
LSI keywords should flow into your writing as if they were always supposed to be there. If you are writing about digital photography and your LSI keyword is “aperture,” it should appear because you are genuinely explaining how aperture affects photos — not because you stuffed it in awkwardly.
Read your content aloud. If a sentence sounds unnatural or clunky, rewrite it. Real readers notice forced language. And so does Google.
Spread Them Throughout the Article
Do not cluster all your LSI keywords in one section. Distribute them evenly across your introduction, body sections, and conclusion. This mirrors the way a subject matter expert would naturally write — touching on related concepts throughout the piece, not in one artificial lump.
Use Them in Headings and Subheadings
Where it makes natural sense, incorporate LSI keywords into your H2 and H3 headings. This helps Google understand the structure of your content and how different subtopics connect to your main keyword. But again — only where it feels natural.
Use Them in Image Alt Text
Every image on your page has an alt text field. Describe your images accurately, and where relevant, include LSI keywords. This is a small but useful signal that reinforces your page’s topical relevance.
Include Them in Your Meta Description
Your meta description — the short snippet of text that appears under your page title in search results — is another place to naturally incorporate an LSI keyword. It will not directly boost your ranking, but it makes your result more relevant and clickable.
How Many LSI Keywords Should You Use?
There is no magic number. The answer depends on your article length, your topic complexity, and how naturally the terms fit.
For a 2,000-word article, you might naturally use anywhere from 10 to 25 related terms and phrases. The key word is naturally. Do not set a target number and start forcing keywords to meet it. Let the depth of your content determine how many related terms appear.
A useful test: if your article genuinely covers a topic well, you will almost automatically include most of the important LSI keywords. That is because real expertise produces natural semantic richness.
Common Mistakes Writers Make with LSI Keywords
After working with hundreds of content pieces on both sides of the Atlantic, I have seen the same mistakes come up again and again.
Mistake 1: Treating LSI keywords like secondary main keywords. LSI keywords are not just extra keywords to optimise for. They are signals of topical depth. If you approach them as another list of terms to stuff in, you have missed the point entirely.
Mistake 2: Ignoring long-tail LSI opportunities. Some of the most powerful LSI keywords are longer phrases — three, four, five words — that represent specific questions or subtopics. These long-tail variations often have lower competition and can drive highly targeted traffic.
Mistake 3: Using LSI keywords without improving content quality. LSI keywords work because they signal comprehensive, expert content. If you sprinkle related terms through a shallow, poorly researched article, you will not see meaningful results. The keywords need to come from genuine depth of coverage.
Mistake 4: Forgetting to check what is already ranking. Always research what Google already rewards before you write. The top-ranking pages are your blueprint. They show you exactly what combination of topics, subtopics, and related terms Google considers authoritative for that keyword.
A Real-World Example: Putting It All Together
Let us say you want to rank for the keyword “sourdough bread recipe.”
Your LSI keywords might include: starter, fermentation, hydration, whole wheat flour, Dutch oven, scoring, crumb structure, bulk fermentation, proofing, tanginess, baking temperature, and gluten development.
A shallow article might just list ingredients and steps — mentioning “sourdough bread recipe” repeatedly.
A comprehensive article would naturally cover all of the above: why fermentation time affects flavour, how hydration affects crumb texture, how to score properly, what temperature to bake at and why, how to tell when proofing is complete. All those LSI keywords appear because the content is genuinely thorough.
Google reads that article and thinks: This page really knows about sourdough bread. And up it goes in the rankings.
LSI Keywords and User Experience: The Hidden Connection
Here is something I find genuinely exciting about LSI keywords — they are not just an SEO trick. They are a measure of how well you serve your reader.
When you cover a topic using its natural related terms and subtopics, you are giving your reader a complete answer. They do not have to go back to Google to fill in the gaps. They do not get halfway through your article and feel like something is missing.
That feeling of completeness — of a reader thinking “Yes, this covered everything I needed” — is what Google’s algorithms are trying to measure and reward. LSI keywords are one of the clearest signals of that completeness.
So when you use LSI keywords well, you are not gaming Google. You are simply doing what good writers have always done: covering a subject properly, from every relevant angle, in language that makes sense to real people.
Quick Reference: LSI Keyword Checklist
Before you publish your next article, run through this checklist:
- [ ] Have you identified 10–20 LSI keywords related to your main topic?
- [ ] Did you find them using at least two methods (autocomplete, related searches, competitor analysis)?
- [ ] Are they distributed naturally throughout the article — not clustered?
- [ ] Do any appear in headings where it feels natural?
- [ ] Have you included them in image alt text where relevant?
- [ ] Does the article read naturally aloud — not forced or robotic?
- [ ] Does your content genuinely cover the topic in depth — not just the keyword count?
If you can check every box on that list, you have done everything right.
Final Thoughts
LSI keywords changed how I write. Not because they gave me a new trick to game Google, but because they made me a more thorough, more helpful writer. They pushed me to stop thinking about keywords and start thinking about topics — the full picture of what a reader needs when they search for something.
If you take one thing from this article, make it this: write for humans first, and let the LSI keywords follow naturally from depth and expertise.
Do that consistently, and Google will notice. Rankings will follow. And more importantly — readers will trust you.
That is the real win.