Duplicate Content Checker
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LSI Keyword Extractor
Pull the related phrases a piece of content actually uses.
Quick Tool Overview
The LSI Keyword Extractor pulls the two, three and four word phrases a piece of content leans on, filtered of common words and ranked by distinctiveness rather than raw count. It is upfront that "LSI keywords" are not a real Google mechanism — what it finds is the vocabulary good coverage of a topic actually uses, which is a genuine gap analysis.
- What it does
- Extracts and ranks the meaningful phrases in a piece of content
- You give it
- A draft or a competitor page, as text or HTML
- You get back
- Ranked two, three and four word phrases with counts
- Best for
- Content gap analysis against a page that already ranks
About the LSI Keyword Extractor
Paste content and the extractor pulls out the two, three and four word phrases it leans on, filtered of common words and ranked by how distinctive each one is rather than by raw frequency. Paste a competitor's page and it tells you what that page is actually about.
A note on the name, since it is worth being straight about it. LSI — latent semantic indexing — is a real technique from the 1980s that Google has confirmed it does not use, and "LSI keywords" as sold by the SEO industry are not a real thing. What is real, and what this tool does, is find the phrases that co-occur with a topic in content that covers it well. Comparing the top three ranking pages for a query against your draft shows you what they discuss and you do not, which is a genuinely useful gap analysis whatever the label on it.
Key features of the LSI Keyword Extractor
Two to four word phrases
Ranked separately, because the useful signal is almost always in the phrases rather than single words.
Distinctiveness, not frequency
Phrases are weighted against ordinary English, so common constructions do not top the list.
HTML stripped
Paste a page straight from view-source and the markup is removed before analysis.
Honest naming
It states that Google has confirmed it does not use latent semantic indexing, and explains what this actually measures.
Minimum length enforced
Below a few hundred words the numbers mean nothing, and it says so rather than inventing them.
How to use the LSI Keyword Extractor
-
1
Paste your content
Your draft, or a competitor page. HTML is stripped automatically.
-
2
Read the ranked phrases
Two, three and four word phrases, filtered of common words and ranked by distinctiveness.
-
3
Compare against a competitor
Run their page, run yours, and the difference is your content gap.
-
4
Write in the gaps
Cover what a good page on this topic covers, in your own words rather than by inserting terms.
Frequently asked questions
Not as the SEO industry sells them. Latent semantic indexing is a genuine 1980s technique, and Google has said publicly that it does not use it. What is real is that pages covering a topic well use a recognisable vocabulary, and finding that vocabulary is useful — whatever it gets called.
Density counts how often one phrase you chose appears. This finds the phrases you did not choose, ranks them by how much they stand out against ordinary language, and shows you what the content is genuinely about — which is often not what its author intended.
No. Inserting terms from a list produces exactly the kind of writing search engines got good at spotting. Use the gaps as prompts for what to cover, then write about it properly and the vocabulary follows on its own.
A few hundred words at minimum. Below that there is not enough text for a frequency measure to mean anything, and the tool says so rather than producing confident nonsense from three sentences.
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