What is a good keyword density for SEO?

Most SEO experts recommend a primary keyword density between 1-3%. Going above 3% may be considered keyword stuffing by search engines. For secondary keywords, 0.5-1% is generally appropriate.

Why does this tool show 2-word and 3-word phrases?

Multi-word phrases (n-grams) are critical for SEO because many search queries are multiple words. Analyzing 2-word and 3-word combinations helps you find long-tail keyword opportunities and natural phrase patterns.

Does this tool filter out common words?

Yes. Common stop words like "the", "is", "at", "and", "a" are excluded from single-word analysis to show meaningful keyword data. They are included in phrase analysis where they may be part of relevant phrases.

Is my text stored or shared?

No. All analysis happens entirely in your browser. Your text never leaves your device and is never stored on any server.

Keyword Density Checker

Analyze word frequency and keyword density for SEO. View single words, 2-word, and 3-word phrase breakdowns.

Paste Your Text to Analyze

Keyword density updates in real-time as you type

0 words

Need to humanize AI content?

Our AI humanizer transforms ChatGPT and AI text into undetectable human writing with 99.9% success rate

Try AI Humanizer Free Check for AI Content

What Is Keyword Density Checker?

A keyword density checker analyzes your text to calculate how frequently specific words and phrases appear relative to the total word count. It breaks your content into single keywords, two-word phrases (bigrams), and three-word phrases (trigrams), giving you a clear picture of your content's topical focus.

Keyword density matters because search engines use word frequency as one signal for understanding what a page is about. Too low, and your content may not rank for target terms. Too high — typically above 3% for a single keyword — and you risk triggering keyword stuffing penalties that can push your page down in search results.

This tool performs real-time n-gram analysis as you type, showing density percentages, occurrence counts, and visual frequency charts. It filters out common stop words automatically so you see only the meaningful terms that affect your SEO profile.

How Keyword Density Checker Works

Step 1: Paste or Type Your Content

Drop your blog post, article, or landing page copy into the text area. The analyzer processes content in real time — no need to click a button. It works with any length of text, from a short product description to a 5,000-word guide.

Step 2: Review Single-Word Keywords

The tool identifies your most frequently used single keywords after filtering common stop words like "the," "and," and "is." Each keyword shows its raw count and density percentage, with a visual bar chart for quick comparison.

Step 3: Analyze Multi-Word Phrases

Switch between 2-word and 3-word phrase tabs to see bigram and trigram frequency. These multi-word phrases often represent your actual target keywords — terms like "keyword density" or "content optimization strategy" that you want to rank for.

Step 4: Optimize Your Density

Use the density percentages to guide your edits. Aim for 1-3% density on primary keywords, 0.5-1% on secondary terms. If any keyword exceeds 3%, consider replacing some instances with synonyms or related phrases to avoid over-optimization.

Key Features

Real-Time N-Gram Analysis

Density calculations update instantly as you type or edit. No waiting for processing — see exactly how each addition or removal affects your keyword distribution across unigrams, bigrams, and trigrams.

Automatic Stop Word Filtering

Common English stop words are excluded from single-keyword results, so you see only content-relevant terms. This eliminates noise and surfaces the keywords that actually matter for your SEO strategy.

Keyword Stuffing Detection

Keywords with abnormally high density are easy to spot in the ranked list. If your primary keyword appears at 5% or above, it's a clear signal to diversify your vocabulary before publishing.

Visual Frequency Charts

Each keyword entry includes a proportional bar showing its frequency relative to the most-used term. This visual hierarchy makes it easy to scan your content's keyword profile at a glance.

Who Should Use This

Keyword density analysis is essential for anyone publishing content that needs to perform in search engines — or anyone reviewing content for quality.

SEO Content Writers

Check that target keywords hit the 1-3% sweet spot before publishing. Catch over-optimized terms that could trigger search engine penalties and dilute your rankings.

Bloggers & Publishers

Ensure your posts are topically focused without being repetitive. Use bigram and trigram analysis to verify that your main topic phrases appear with consistent frequency throughout the article.

SEO Auditors & Agencies

Audit client content at scale by pasting articles and immediately seeing keyword distribution. Identify thin content, keyword-stuffed pages, and opportunities to strengthen topical relevance.

Marketing Teams

Review landing pages, product descriptions, and ad copy to ensure brand terms and product keywords appear at appropriate frequencies without sounding repetitive or robotic.

Keyword Density Checker vs Manual Word Counting

Manually counting keyword occurrences in a 2,000-word article is tedious and error-prone. You might catch your primary keyword, but you'll miss how often secondary terms, bigrams, and trigrams appear — and those multi-word phrases are often the real ranking signals.

An automated density checker processes your entire text in milliseconds, catching patterns that are invisible to manual review. It reveals not just individual keyword frequency but the relationship between terms — whether your content is balanced across related phrases or over-indexed on a single term.

The real value is in the feedback loop: edit your text, see the density shift immediately, edit again. This iterative optimization is impractical with manual counting but trivial with a live analysis tool.

Try Keyword Density Checker free — no signup required

Part of HumanizeThisAI's suite of 59+ free writing tools. Need to humanize AI text? Try our AI humanizer.

FAQ

Questions & answers

Everything about keyword density analysis.