Google Keyword Planner is a free keyword research tool built into Google Ads. It is designed for advertisers planning campaigns, but SEOs use it constantly to find keyword ideas, gauge search-volume ranges, check competition, and see cost estimates, all drawn straight from Google's own data.
The main limitation for SEO is precision. Without ongoing ad spend, Planner groups close variants together and shows broad ranges instead of exact numbers, so treat it as a starting point rather than a final source of truth.
An SEO researching a kitchenware client seeded Planner with "cast iron skillet." It returned adjacent ideas like "how to season cast iron," clearly informational, alongside "enamel dutch oven," which is commercial. Sorting those by intent revealed a clean split between blog content and category pages. Because the volume for the head term showed as a 10K to 100K range, the researcher cross-checked exact figures in a dedicated tool before finalising priorities.
It is reliable for discovering terms and understanding relative demand, but its bucketed volumes are too coarse for tight forecasting. Pair it with a dedicated research tool when you need firm numbers.
No. A Google Ads account is required, but the Planner itself is free. Active spend simply unlocks more precise volume figures.
Solid research underpins everything downstream, which is why we treat keyword research as the foundation and track search volume across every priority term.