How to Use the LSI Keyword Clusterer
Group related keywords together to build stronger content silos and topic clusters for SEO.
Step 1: Enter your keywords, one per line.
Step 2: Click "Cluster Keywords." The tool groups keywords that share common root words.
Step 3: Use the clusters to plan your content calendar — one pillar page per cluster, with supporting articles for each keyword.
Topic Clusters: The Modern SEO Framework
Search engines in 2026 evaluate topical authority — how comprehensively your site covers a subject. The topic cluster model organizes content into pillar pages (broad, comprehensive guides) and cluster content (specific, detailed articles) linked together. LSI (Latent Semantic Indexing) keyword clustering helps you identify which keywords belong to the same topic.
How the Clustering Algorithm Works
The tool compares each keyword against every other keyword, counting shared words longer than two characters. Keywords that share enough words are grouped into the same cluster. The first keyword in each cluster becomes the "root" or representative term. This simple approach works surprisingly well for organizing content strategies.
From Clusters to Content
Each cluster represents a content topic. Create one comprehensive pillar page targeting the root keyword, then create supporting articles for each additional keyword in the cluster. Link them together to signal topical authority to search engines.
Frequently Asked Questions
Enter 10–50 keywords for best results. Too few will produce trivial clusters; too many may create overly large groups that need manual refinement.
The tool assigns each keyword to the first matching cluster. For overlapping topics, manually review and reassign keywords as needed.
Traditional LSI is a mathematical technique involving matrix decomposition. This tool uses a simpler word-overlap heuristic that achieves similar practical results for content planning purposes.