Question 1

What is the best keyword clustering tool?

Accepted Answer

No independent benchmark proves one clustering tool "the best" — results depend on the similarity method and threshold, which many tools hide. This free tool publishes its exact method (stemmed-token Jaccard, greedy single-link) and lets you tune the threshold yourself.

Question 2

Is there a free keyword clustering tool?

Accepted Answer

Yes — this tool is completely free with no signup and runs entirely in your browser. It groups up to 500 keywords using transparent heuristic rules rather than paid embedding APIs.

Question 3

How to use keyword clustering?

Accepted Answer

Paste a keyword list, pick a similarity threshold, and cluster: each resulting group should become one page or article so similar keywords do not compete with each other. Review the groups by hand — automated clustering is a draft, not a final content plan.

Question 4

How does a keyword clustering tool work?

Accepted Answer

This one compares keywords by the overlap of their stemmed words (Jaccard similarity) and greedily groups keywords that score above your threshold. It does not understand meaning the way embeddings do — "cheap flights" and "affordable airfare" share no words and will not cluster.

Question 5

What is keyword clustering in SEO?

Accepted Answer

Keyword clustering groups search terms that target the same topic so one page can rank for all of them. This tool clusters up to 500 keywords by stemmed word overlap and labels each group, so each cluster becomes a single article instead of competing pages.

Question 6

Does keyword clustering help with keyword cannibalization?

Accepted Answer

Yes — when two pages chase overlapping terms they can split your rankings, and clustering exposes those overlaps before you write. This tool shows which keywords belong together in one cluster so you build a single page per topic instead of several near-duplicates.

Question 7

How do I choose the similarity threshold?

Accepted Answer

Start with the default 0.35 and inspect the clusters: raise the threshold toward 0.6 to split groups that feel too loose, or lower it toward 0.1 to merge lonely keywords. The tool reports unclustered keywords separately, which tells you when your threshold is too strict.

Keyword Clustering Tool – Free SEO