Free Keyword Density Checker
Analyze any text for keyword density. See top single words, 2-word phrases (bigrams), and 3-word phrases (trigrams). Stop words excluded automatically. Free, in your browser.
AI semantic gap finderFree
Paste text below. AI finds related/LSI keywords that competitors include but YOUR content is missing — direct ranking wins.
Healthy keyword density
- 1-3% for your target keyword is generally considered natural and safe.
- 3-5% may still be fine for highly relevant content but starts to feel forced.
- 5%+ usually reads as over-optimization — Google's algorithm has flagged keyword stuffing since 2011.
- Use synonyms and related terms — modern SEO rewards topical depth over exact keyword repetition.
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Frequently asked questions
What is keyword density and why does it matter?
Keyword density is how often a word or phrase appears compared to total words. Too low (<0.5%) and Google may not connect your page to that topic; too high (>5%) looks like keyword stuffing and risks a penalty. The sweet spot is around 1-3% for your primary keyword.
How is 'semantic gap' different from density?
Density only counts what's already in your text. The semantic gap finder uses AI to discover related keywords competitors include — but YOUR text is missing. Adding those raises topic depth, which Google rewards in 2026 rankings.
Does this work for non-English text?
The density counter works on any language. The AI semantic gap finder works best in English and major European/Asian languages.
Can I paste my full blog post?
Yes — paste up to 10,000 characters. The analyzer ignores common stop words (the, and, of, etc.) and groups n-grams from single words up to 3-word phrases.
Most density checkers only count words. Ours adds an AI 'semantic gap finder' — it discovers related keywords competitors include but your draft is missing. Adding those raises topic depth, which Google rewards heavily in 2026.
How to use
- 1Paste your blog text (or draft).
- 2Optionally enter a seed topic if your top word doesn't match the focus.
- 3Click 'Find missing keywords' — AI compares your content against what competitors cover.
- 4Review missing semantic terms + PAA questions — add them to your draft.
Why use this tool
- Unique semantic gap analysis — competitors don't offer this for free.
- 1-3% density is the sweet spot — over 5% gets flagged red.
- Surfaces 'People Also Ask' questions to add as H3 headings.
Real-world examples
Editor review
Paste a 1500-word article about 'how regex works' → AI says you missed 'lookahead', 'capture groups', and 'PCRE differences' — common terms ranking competitors use.
Optimising old posts
Paste 2022 blog post → AI returns 8 LSI keywords + 3 PAA questions you can add as H3 sections to refresh the post for 2026.