Free keyword clustering tool options, and where they stop
Spreadsheets, scripts and trials are free in money but not in time; a 3-credit seogeoaeo.ai run sits in between.
By ClaudeGPT Si Newsroom · Editorial team
· 2 min read
A free keyword clustering tool usually means one of three things: a spreadsheet you sort by hand, a short script you run yourself, or a trial of a paid service. If your time is worth more than a few cents, the practical answer is a pay-per-run tool such as seogeoaeo.ai's clusterer, which groups a pasted list for 3 credits and costs nothing when a run fails.
Here is what each free route gives you, and where it stops.
Option 1: a spreadsheet
Paste your keywords into one column. Sort alphabetically, then add a "group" column and label each row by its main word: "shoes", "socks", "laces". Filter by label and you have rough clusters.
Good for: lists under a hundred or so phrases. Where it stops: sorting only puts keywords together when they start with the same word. "Best trail shoes" and "trail shoes for women" end up far apart. Past a few hundred rows, the labelling turns into an afternoon of scrolling.
Option 2: a script
If you or someone on the team writes code, a short Python script can split each keyword into words, drop filler like "best" and "for", and group phrases that share the remaining words. Open-source libraries can go further and group by meaning.
Good for: people who already have a coding setup and want full control. Where it stops: you own the edge cases, the stop-word list and the maintenance. It is free in money, not in hours.
Option 3: a paid tool's trial
Several clustering services that compare Google results offer a way in. Keyword Insights, for example, offers a $1 trial for seven days, and SE Ranking offers a free trial of its suite, which includes a keyword grouper. Results-based clustering is the more accurate method when a list hides intent behind similar words.
Good for: a one-off large project where intent is hard to read. Where it stops: trials end, and the subscriptions behind them are built for teams doing this weekly.
The low-cost middle
| Route | Money | Time | Output |
|---|---|---|---|
| Spreadsheet | Free | High | Rough groups by first word |
| Script | Free | Medium to high | Whatever you build |
| Paid trial | Low at first, then a subscription | Low | Results-based clusters |
| seogeoaeo.ai Keyword Clusterer | 3 credits a run | Low | Clusters with a suggested page path each |
seogeoaeo.ai sits between the free routes and the suites. You paste up to 20,000 characters of keywords, one per line, and get topic groups built from the words they share, each with a suggested parent page path. It uses no embeddings, language model or live search data, so it will not catch synonyms that share no words. For those, a results-based tool is still the better pick.
It is not free. You need a plan to hold credits, starting at $29 a month, and the free preview on its home page is a site check, not clustering. But a single run is a tiny fraction of that, and the same credits run its other SEO tools, such as the Keyword Deduplicator, which the clusterer page suggests running first.
A quick way to decide
- Under 100 keywords and an hour to spare: the spreadsheet.
- You code and like tinkering: the script.
- A big, messy list with mixed intent: a results-based trial.
- Everything in between: a 3-credit clustering run, then a quick read of each group before you write.