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Free LSI Keyword Generator
Enter a keyword to get 20 semantically related terms and entities — the supporting vocabulary that signals topical depth and helps you rank for more searches.
What are LSI keywords?
LSI keywords (latent semantic indexing) is the popular term for words and phrases that are conceptually related to your main keyword. A page about "content marketing" should naturally also mention SEO, blogging, lead generation, distribution, and analytics — that related vocabulary tells search engines your page covers the topic in depth.
Modern search engines do not literally use 1970s LSI maths, but the principle holds: topical breadth beats keyword repetition. Covering the related concepts is how you signal genuine expertise.
How to use related keywords
- Weave them naturally into headings and body copy — never force them.
- Use them to spot subtopics you forgot to cover.
- Turn them into H2 sections to deepen the article.
- Combine with the search intent — they should support the query, not distract from it.
Frequently asked questions
What is an LSI keyword?
A word or phrase semantically related to your main keyword. Including related terms signals topical depth and helps your page rank for a wider set of related searches.
Do LSI keywords help SEO?
Yes, indirectly. Covering related concepts demonstrates topical authority and helps search engines understand your page, which supports rankings — far more than repeating the exact keyword.
How many related keywords should I use?
There is no fixed number. Use the ones that genuinely fit your topic and reader. Quality and relevance matter more than quantity.
Is this free?
Yes — free with no sign-up. Start a Writelio trial for unlimited use and full keyword research baked into the article pipeline.