SEO keyword generator: where the ideas come from, what the volume figure means, and how to turn a raw list into a plan

A keyword generator takes a seed word or a website and returns related phrases with an estimated search volume beside each one. The ideas come from four places: the Google Ads advertising data behind Keyword Planner, the third party indexes built by tools such as Semrush, Ahrefs and Moz, scrapes of autocomplete and People Also Ask, and the queries your own site already gets impressions for in Search Console. The volume figure is an estimate of average monthly searches, so read it as a size band for comparing one phrase with another rather than a forecast of visits. The useful output is not the list. It is the grouped plan you build from it, where phrases that want the same answer become one page.

This page covers how the ideas and the numbers are produced, and how to turn a raw export into a page plan. For taking the next step and checking where you rank for the phrases you choose, see a guide to checking keyword rankings.

Where the ideas actually come from

Source	How ideas are produced	What it is strongest at
Google Keyword Planner	You enter terms or a website URL and Google returns related keywords from its advertising data	Figures that come from Google itself, and commercial phrases that advertisers bid on
Third party tools	A crawled index of results pages plus their own search demand modelling	Volume, difficulty and the phrases competitors already rank for, in one table
Autocomplete and related searches	Harvested suggestions from the search box, People Also Ask and related search blocks	Real phrasing, questions, and long tail you would never have guessed
Your own Search Console	The queries that already produced impressions for your pages	Demand you have already proven you can reach

Keyword Planner is the base layer for most of the market. The Google help page on using Keyword Planner describes both routes: enter words related to your business, or submit a website and let Google read it for ideas. The Google note on building a keyword list is the other half of the job, grouping by theme and thinking in the words a customer would use. AnswerThePublic is the best known of the autocomplete harvesters, and Semrush, Ahrefs and Moz publish their own plans and feature lists.

What the volume number means

• It is an average, usually over twelve months. A phrase that gets most of its searches in two weeks of November reads as a flat monthly figure all year. Put any seasonal phrase through Google Trends before you plan around it.
• Different tools print different figures for the same phrase, because each one models demand from a different index. Pick one tool as your reference and compare phrases inside it.
• Trends values are relative, not counts. The Google Trends FAQ is explicit: each point is divided by total searches for that place and period, then scaled from 0 to 100. It answers "is this rising" and never "how many people".
• Keyword Planner forecasts are short range. The Google help says forecasts are refreshed daily and based on the last 7 to 10 days, adjusted for seasonality. Useful for the next month, not for next year.
• A low number is not a reason to skip a phrase. Twenty searches a month from somebody typing "x pricing for 50 users" is worth more than two thousand from "what is x". Intent beats volume on every commercial page you will ever write.

The free stack, in the order to use it

• Search Console queries first. Performance, Search results, last three months, sort by impressions, then look at every row with impressions and almost no clicks. That is demand you already touch.
• Keyword Planner on your own URL, then on two competitor URLs. The website route often returns the vocabulary your market uses rather than the vocabulary you use.
• Autocomplete by hand. Type your core term plus each letter of the alphabet, then the question words: how, why, best, vs, near me, for, without, alternative, cost.
• Competitor sitemaps. Open their sitemap.xml and read the URL slugs. It is a free list of every topic a funded competitor decided was worth a page.
• Your sales inbox and support tickets. The exact sentence a buyer wrote is a keyword, and it is one no generator will surface.

From a raw list to a plan

A generator hands you two thousand rows. A plan is thirty pages. The work between them is five passes.

• Pass one, clean. Remove brand names you cannot serve, locations you do not cover, and anything plainly irrelevant. Deduplicate plurals and word order.
• Pass two, group by answer. If two phrases want the same answer, they are one page. "keyword generator", "seo keyword generator" and "generate seo keywords" are one page. "keyword generator vs keyword research tool" is a different page because the answer is different.
• Pass three, label the intent. Four labels are enough: learn, compare, buy, and find a local supplier. The label decides the page format, not the word count.
• Pass four, look at the results page for the biggest phrase in each group. What ranks tells you what Google thinks the query means. If the whole first page is product listings and you planned a blog post, change the plan or change the phrase.
• Pass five, sequence. Rank the groups by three things in this order: do you already have impressions for it, how commercial is the intent, and how strong are the pages that currently rank. Build the top ten, not the top hundred.

A grouping sheet that survives a handover

Group: keyword generation          Intent: learn
  Primary:   seo keyword generator            [vol band: high]
  Also:      generate seo keywords, keyword ideas generator,
             free keyword generator, keyword suggestion tool
  Target page: /guides/keyword-generator      Status: to write
  SERP check: guides and tool pages mixed, so a guide can rank
  Owner: [name]        Due: [date]

Group: keyword research service    Intent: buy
  Primary:   keyword research services        [vol band: low]
  Also:      hire keyword research, keyword research consultant
  Target page: /services/keyword-research     Status: live, thin
  SERP check: agency pages only, so this needs a service page

One row per group, one target page per group, one owner. Two pages aimed at the same group is the most common self inflicted ranking problem there is, and this sheet is what prevents it. The Google SEO starter guide makes the same point from the other direction: write the page for people, and keep one clear page per thing you offer.

Mistakes that cost a quarter

• Treating the export as the plan. Two thousand rows with no groups is a list, and a list has never ranked for anything.
• Sorting by volume and starting at the top. The biggest phrases are usually the ones held by sites with ten years of links. Start where you already have impressions.
• Ignoring what the results page says the query means. This is the cheapest check in the whole process and the most often skipped.
• One page per phrase. It splits your own signals across near identical pages and makes both weaker.
• Never re-running it. Refresh the list every quarter so you are working from current demand and catching new phrasing early.

Asked and answered: SEO keyword generator

What is the best free keyword generator?

Keyword Planner for figures that come from Google, plus your own Search Console queries for demand you already reach. Between them they cover most of what a small team needs. Paid tools earn their place when you need competitor rankings and difficulty scores in the same table.

Why do two tools show different search volumes?

Each one builds its estimate from a different index and a different model. Choose one as your reference, compare phrases within it, and record which tool each number came from.

How many keywords should one page target?

One group, which is usually five to twenty phrasings of the same question, with one of them named as the primary. Write for the group, use the primary in the title, and let the variants appear naturally because you answered the question properly.

Do keyword difficulty scores matter?

They are a useful first filter and a poor final answer. Open the results page and look at who is there. Three forum threads and a thin listicle mean an opening, whatever the score says.

How often should I regenerate the list?

Once a quarter for the full sweep, and a five minute look at new Search Console queries every month. New phrasing shows up there first.

Can I use an AI chatbot to generate keywords?

It is good at phrasings, question forms and groupings, which is the creative half of the job. Pair it with Keyword Planner or a paid tool for the figures, so the ideas are wide and the numbers come from a search data source.

The list nobody is generating yet

Every method above generates keywords, which are the words people type into a search box. A growing share of buyers now type whole questions into an assistant instead, and the answer they get is a paragraph naming two or three suppliers rather than a page of links. That answer is built from a prompt, not a keyword, and the same prompt put to ChatGPT, Gemini, Perplexity, Claude and Google AI Overviews returns different company names. It is worth keeping a second list beside your keyword sheet: the ten questions a buyer would actually ask an assistant before choosing a supplier in your category, written without your brand name in them, and a note on who gets named today. AI Knows Us runs those prompts across the assistants and records the answers.