Is there a perfect keyword density percentage for SEO?

No, and anyone selling you one is selling you 2005's SEO advice in 2026's market. Primary keywords tend to land naturally between 0.5% and 2.5% in well-written content. Above 4% looks like stuffing. Below 0.3% looks like the article isn't really about what it claims. But context matters — a 300-word product page has higher natural density than a 3,000-word guide. The number is a sanity check, not a target.

Why does the tool count phrases with at least 2 occurrences?

Because single-occurrence phrases are noise. Any 5,000-word article has tens of thousands of unique 3-word combinations that appear exactly once. Filtering to phrases that appear at least twice gives you what's actually repeated — which is what keyword density analysis is measuring in the first place. Single-occurrence terms are worth looking at for LSI-style coverage, but that's a different analysis than density.

What's the difference between this tool and a keyword research tool?

Keyword research tools (like SEMrush, Ahrefs, or the Google Keyword Planner) tell you what phrases people are searching for and how much competition each one has. This tool tells you how often phrases appear in content you already have. Research happens before writing; density analysis happens after. They're complementary: research selects the keywords you should target, density confirms whether you actually did.

Does the 4% warning mean my article will be penalized by Google?

Not directly — there's no specific density threshold at which Google flips a penalty switch. But 4%+ density is a reliable indicator that the content reads as over-optimized to human readers as well, and Google's quality signals (time on page, pogo-sticking back to search results) will reflect that. The warning is an empirical red flag, not a technical trigger. Fix it because the content will be better, not because you're dodging a specific penalty.

Can I analyze a competitor's article with this tool?

Yes. Copy the article text from your competitor's page (just the content, not the navigation and footer) and paste it in. You'll see exactly what terms they're targeting and at what density. This is useful for calibrating your own targets — if the top 3 ranking articles for your topic all cluster around 1.5% for the primary keyword, that's probably the range the market is rewarding. This isn't scraping or anything shady — it's just reading their content more carefully than most readers do.

Does this tool work offline, and is my content private?

Yes to both. The analysis runs entirely in your browser — tokenization, n-gram generation, stopword filtering, density calculation — all client-side JavaScript. Your content is never sent to any server, which matters when you're analyzing drafts that haven't been published yet, client content under NDA, or internal documents. You can verify by opening DevTools Network tab: zero outgoing requests when you paste and analyze.

How to Check Keyword Density for SEO (2026 Guide)

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