How to use the Keyword Density Checker
Keyword density is one signal Google uses to figure out what a page is about. Too low and the page is ambiguous; too high and Google flags it as keyword stuffing. The sweet spot is 0.5–2.5% for the primary keyword.
Paste your content
Drop in your article, blog post, or landing page copy. Don't include nav, footer, or boilerplate — only the unique content you're optimizing.
Read the density table
The tool ranks 1-, 2-, and 3-word phrases by frequency. The primary keyword should be near the top; if it isn't, the page is off-topic or under-optimized.
Check for over-optimization
Anything above 4% on the primary keyword risks a keyword-stuffing flag. Density rises naturally on focused content — if you're consciously hitting 5%+, you're forcing it.
Adjust and re-check
Add or remove uses of the primary keyword to land in the 0.5–2.5% range. Use semantic variants (synonyms, plurals, related terms) for the rest of your topical coverage.
Why keyword density still matters (with caveats)
Modern Google ranks pages on semantic relevance, not raw keyword counts — but density still indicates what a page is primarily about. The right density signals topical focus; the wrong density signals either dilution or stuffing.
The 0.5–2.5% target range
For a 1,500-word article, this works out to roughly 8–37 mentions of the primary keyword. Most well-optimized pages cluster between 1.0% and 2.0% — the keyword shows up in the title, H1, the first 100 words, every couple of section headers, and naturally inside the body.
What density misses (and what beats it)
Density is a blunt metric. It can't distinguish between "sneakers" in your H1 versus "sneakers" buried in a footer disclaimer. The signals Google actually weighs more heavily:
- Position — keyword in the title, H1, first paragraph, URL slug.
- Co-occurrence — semantically related terms (entities, synonyms, LSI keywords).
- Headings hierarchy — keyword variants in H2/H3 structure.
- Anchor text — internal links pointing to the page that contain the keyword.
- User behavior — dwell time and bounce rate for the keyword's queries.
Keyword stuffing penalties
Google actively penalizes keyword stuffing, but the threshold is fuzzier than people think. A density above 4% combined with unnatural phrasing ("buy cheap sneakers cheap sneakers online") is a clear stuff. A 5% density on a page that's genuinely about that exact keyword (a definition page, a glossary entry) usually flies. The tell is naturalness, not just count.
Frequently asked questions
What is keyword density?
Keyword density is the percentage of times a target keyword appears in your content relative to the total word count. A 1,500-word article that mentions "running shoes" 20 times has a 1.33% density. Google uses density (along with many other signals) to determine what a page is primarily about.
What's the ideal keyword density for SEO?
0.5% to 2.5% for the primary keyword. Below 0.5%, the page reads as off-topic or thin. Above 4%, you risk a keyword-stuffing flag. Most well-ranking pages cluster between 1% and 2% — natural usage on focused content tends to land there without forcing it.
Does Google still use keyword density?
Yes, but not the way it used to. Modern Google relies on semantic understanding (BERT, MUM) more than raw keyword counts. Density is a weak signal compared to topical depth, entity coverage, and user-behavior metrics. But it's still a useful diagnostic — if your target keyword density is near 0%, the page probably isn't focused enough to rank for it.
What is keyword stuffing?
Keyword stuffing is the practice of cramming a target keyword into a page unnaturally — through repetition, irrelevant filler text, hidden text, or thesaurus-style list dumps. Google penalizes it manually and algorithmically. The typical stuffing threshold sits around 4–5% density combined with awkward phrasing, but Google's spam team can flag well below that if the writing is forced.
Should I include synonyms and related keywords?
Yes. Modern Google rewards semantic depth over raw keyword repetition. A page about "running shoes" that also mentions "trainers", "sneakers", "footwear", "cushioning", "arch support", and specific brands signals topical authority more strongly than a page that uses "running shoes" 30 times.