Semrush Keyword Magic Tool: How to Do Keyword Research in 2026

The Keyword Magic Tool is the reason a lot of people pay for Semrush — it turns one seed word into a structured content plan. It sits on one of the largest keyword databases in the industry (over 25 billion keywords across 140-plus regional databases), and once you know the workflow, it’s the fastest way I’ve found to go from a vague topic to a prioritised list of pages worth building.

What the Keyword Magic Tool does

You type one seed keyword; it returns up to millions of related queries, each with the metrics that actually decide whether a keyword is worth chasing:

• Search volume — average monthly searches, with a 12-month trend so you can spot seasonality or a fading topic.
• Keyword difficulty (KD %) — how hard the first page is to crack, so you don’t waste months on a term you can’t win.
• Search intent — informational, commercial, transactional or navigational. This is the metric beginners ignore and pros live by.
• CPC and competitive density — how commercially valuable the term is.

The left-hand panel groups everything into topic clusters automatically, which is the real magic: it hands you the sub-topics to build out, not just a flat list.

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A practical keyword workflow

Here’s the exact way I use it, which you can copy:

1. Start broad. Enter your core topic and read the cluster panel on the left — those groups are your future site sections.
2. Filter by intent. Match keywords to the page you’re building. Writing a guide? Filter to informational. Building a product page? Transactional or commercial.
3. Filter KD to your reality. New site: start with KD under ~30 so you can actually rank. Established site: push higher.
4. Hunt long-tail. Set a minimum word count or use the “questions” filter. Long-tail terms convert better and are far easier to rank — see my note on long-tail keywords for how to layer them in.
5. Export the winners to a list, and check each against what already ranks using Organic Research.

The one mistake to avoid

Chasing volume. A 40,000-search keyword you can’t rank for is worth nothing; a 300-search term with clear intent that you rank #1 for pays the bills. Sort by opportunity — intent plus achievable difficulty — not by the biggest number. That single discipline is what separates a keyword list that ranks from one that just looks impressive.

How it fits the rest of Semrush

Keyword research is step one, not the whole job. Once you have your list, pressure-test it against competitors in Organic Research, make sure your site can technically support the pages with a Site Audit, and if you’re weighing which plan you need for the keyword limits, I broke that down in Semrush Pro vs Guru. New to the platform entirely? Start with how to use Semrush. On a zero budget? Here are the free keyword research tools worth using first.

See Semrush plans and pricing→

Frequently asked questions

Is the Keyword Magic Tool free?

You get limited access on the free Semrush account (about 10 searches a day), and full access on any paid plan or the 7-day Pro trial. There is no way to buy the Keyword Magic Tool on its own.

How big is the Semrush keyword database?

Over 25 billion keywords across more than 140 regional databases as of 2026 — one of the largest available, which is why it rarely runs out of ideas for a topic.

What keyword difficulty should I target?

On a new or low-authority site, start with keyword difficulty under about 30 so you can realistically rank. As your site earns authority, you can chase progressively harder terms.

Why does search intent matter more than volume?

Intent tells you what the searcher wants, so you build the right kind of page. A lower-volume keyword with clear intent that you rank #1 for beats a high-volume term you can neither rank for nor convert.