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Keyword Clusterer - Group Similar Keywords Free

Cluster hundreds of keywords into topic groups with pure PHP — no API cost. Free tool for content mapping.

How to use

  1. Paste your keywords, one per line.
  2. Click Cluster to group by shared meaningful words.
  3. Each cluster header suggests the pillar topic; download the map.

Frequently asked questions

How does clustering work?

Keywords sharing 2+ meaningful words (or 34%+ token overlap) land in the same cluster, sorted biggest-first.

Does it use AI or paid APIs?

No — pure PHP string similarity, so it is free and unlimited.

What do I do with clusters?

Turn each cluster into one article (keywords as H2s) or one category page to avoid keyword cannibalization.