How Many Keywords for SEO
SEO pages work best when they target one primary keyword plus a small set of closely related secondary keywords that match the same search intent.
If you have ever tried to rank a page for five unrelated keywords and wondered why it failed, you already know the number is not the real problem.
Key points
- Pick one primary keyword that matches the page’s core topic and search intent.
- Add 2–4 secondary keywords that are natural variations of the primary term.
- Avoid targeting unrelated keywords on the same page—it dilutes topical focus.
- Write naturally; keyword density above 1–2% risks sounding stuffed.
- Use the primary keyword in the title, intro, and at least one heading where it fits.
A single page that outranks a dozen thin ones
A photographer wanted to rank for 'wedding photography London', 'London wedding photographer', and 'affordable wedding photos London'. Instead of creating three pages, she built one page targeting the primary keyword 'wedding photography London' with secondary terms like 'London wedding photographer' and 'affordable wedding photos London' in natural headings. The page ranked in the top three for all three terms within four months, while competitors with separate pages for each term saw cannibalisation.
Three common mistakes when choosing keywords
- Targeting too many unrelated terms Adding keywords from different topics forces a page to cover too much ground, confusing search engines and readers. Stick to one topic per page.
- Forcing exact-match into every heading Repeating the same phrase in every subheading reads unnaturally and can trigger keyword stuffing filters. Use synonyms and natural variations instead.
- Creating near-duplicate pages for variations Building separate pages for 'SEO for artists' and 'author SEO' when the intent is the same wastes crawl budget and causes keyword cannibalisation. Consolidate into one strong page.
Four factors that determine the right number
- Page length and depth A 2,000-word guide can support more secondary keywords than a 300-word product description because it has room to cover subtopics naturally.
- Search intent alignment Informational queries (e.g., 'how many keywords for seo') allow more variations than transactional ones (e.g., 'buy SEO tool'), which need tight focus.
- Competitive landscape If top results use 1 primary and 3 secondary keywords, matching that pattern is safer than trying to outdo them with 10 terms.
- Natural language flow Google’s guidance emphasises helpful content over exact counts. If a keyword fits naturally, include it; if it feels forced, leave it out.
Three situations where more keywords work
- Long-form pillar pages A comprehensive guide on 'SEO for designers' can cover related terms like 'keyword research for designers' and 'on-page SEO for portfolios' without diluting focus.
- Topic clusters with a hub page A hub page linking to cluster articles can target a broad primary keyword and several secondary ones, as long as each cluster article handles its own primary term.
- Pages with strong internal linking When you link to dedicated pages for each secondary keyword, the main page can mention them without competing for the same ranking.
Common questions
How many keywords should I use in an article?
Aim for one primary keyword and 2–4 secondary keywords that are closely related to the main topic. More than that risks diluting focus.
How many keywords per page is too many?
There is no hard limit, but targeting more than 5–6 unrelated keywords often confuses search intent and reduces ranking potential.
Does keyword density still matter?
Google does not use density as a ranking factor, but repeating a keyword too often can look like stuffing. Write naturally and cover the topic thoroughly.
Sources
- Google Search Central Official guidance on helpful content and natural language
- SEOptimer Recommends 1 primary + 2–4 secondary keywords per page
- Brafton Explains why intent matters more than keyword count