Productive ToolboxKeyword Density Checker
Analyze your text to measure keyword frequency and density percentages. Track target keywords, filter stop words, flag overused terms, and export results for SEO content optimization.
Analysis Options
Ready to Analyze
Paste your text above to see keyword density, word frequency, and optimize your content for SEO.
Next step
Related tools
What Is a Keyword Density Checker?
A keyword density checker is a free online SEO tool that measures how frequently each word appears in your text and expresses it as a percentage of the total word count. It answers the question every SEO writer eventually asks: am I using my target keywords enough — or too much?
The calculation is straightforward, but reading the results usefully requires filtering. Without stop-word removal, the results are dominated by "the," "and," "is," and other words that carry no SEO weight. Without minimum word length controls, short fragments clutter the table. Without target keyword tracking, you have to manually scan hundreds of rows to find the three terms you actually care about. This word density checker handles all of that in one workflow — paste your text, check keyword and word density instantly, spot keyword stuffing before it goes live, and get export-ready results in seconds.
Built for SEO writers, content strategists, copyeditors, agency teams, and bloggers who need fast, accurate keyword analysis before publishing. Paste any content and instantly see keyword density percentages, overuse flags, a visual keyword chart, and CSV/JSON export — all online with no account required.
How Keyword Density and Word Density Analysis Works
The tool tokenizes your text — splitting it into individual words — then counts occurrences of each unique token and divides by the total word count. Every word gets a density score simultaneously.
Core Formula
Keyword Density (%) = (Keyword Count ÷ Total Words) × 100
Example: "content" appears 9 times in a 450-word article → 9 ÷ 450 × 100 = 2.0%
Key concepts this tool applies on top of the base formula:
- Stop-word filtering — removes common words (the, is, and, of) so results focus on meaningful terms
- Minimum word length — excludes tokens shorter than your set threshold (default: 3 characters)
- Case normalization — merges "SEO," "seo," and "Seo" into one count unless case-sensitive mode is on
- Overuse threshold — flags any term above 5% density for manual review
- Target keywords — each word or phrase you add gets its own count and density, with a note if it is missing
- Phrases — two- and three-word phrases used at least twice, counted within sentences
How to Use the Keyword Density Checker
Step-by-Step Guide
- 1Paste your content: Paste your article, page copy or draft into the editor; the analysis updates as you type.
- 2Set the options: Turn stop-word filtering on or off, choose case-sensitive counting and set a minimum word length.
- 3Switch between words and phrases: Use the tabs to see single words, two-word phrases or three-word phrases. Phrases are counted within sentences and listed when they appear at least twice.
- 4Check your target keywords: Add the words or phrases you want to rank for, separated by commas. Each one shows how many times it appears, its density and whether it was found at all.
- 5Review the results: Sort the table by count or density; anything at 5% or more is flagged so you can check whether it reads naturally.
- 6Copy or export: Copy the list or download it as CSV or JSON.
What This Tool Provides
- ✓Real-time keyword density analysis as you type
- ✓Word count, keyword count, and density % for every term
- ✓Word density checker — frequency ranked by count and %
- ✓Keyword stuffing checker — overuse flags above 5% density
- ✓Stop-word filtering to surface meaningful keywords
- ✓Case-sensitive mode for brand and acronym precision
- ✓Minimum word length control
- ✓Two- and three-word phrase density
- ✓Target keywords and phrases with their own count and density
- ✓Visual bar chart of top keywords
- ✓Sortable results table
- ✓Export to CSV and JSON
- ✓Private: your inputs are not collected or stored
- ✓No signup required
Worked Examples
SEO Blog Post Optimization
A writer is finishing a 1,200-word post about project management software. She pastes the draft, turns on stop-word filtering and adds project, management and software as target words. Project is at 3.1% and management at 2.8%, but software is at 6.4% and flagged as overused, so she swaps three uses for tool and platform and brings it down to about 3%.
Landing Page Copy Review
A conversion copywriter is reviewing a 500-word SaaS landing page before it goes live. He pastes the copy and checks density without stop-word filtering to see every token. The word 'you' appears at 8.2% — high but intentional for direct-response copy. The word 'pricing' appears 0 times. He adds it twice in the features section, bringing the conversion-critical term to 0.4% and ensuring it appears on the page for both users and crawlers.
Editorial Quality Check
A senior editor at a content agency runs every submitted article through the checker before approval. A 900-word article submitted by a new writer shows 'important' at 4.7% and 'ensure' at 3.9% — both filler words that survived multiple drafts. The editor returns the piece with the density export attached, asking the writer to replace those instances with specific, concrete language. The revised version scores cleaner across the board.
Keyword Density Reference & Industry Benchmarks
Density Ranges by Use Case
| Density Range | Interpretation | Action |
|---|---|---|
| < 0.5% | Under-represented | Consider adding if term is important |
| 0.5–1.0% | Light presence | Fine for secondary / LSI keywords |
| 1.0–2.0% | Natural range | Typical primary keyword target |
| 2.0–3.0% | Prominent | Acceptable; verify readability |
| 3.0–5.0% | Heavy use | Review surrounding sentences for flow |
| > 5.0% | Overuse flag | Likely needs synonym variation |
Formula Reference
| Output | Formula | Example |
|---|---|---|
| Keyword Density | (Count ÷ Total Words) × 100 | 9 ÷ 450 × 100 = 2.0% |
| Word Count | Total tokens after split | 450 words → 450 |
| Keyword Count | Occurrences of exact token | "SEO" found 9 times |
| Overuse Flag | Density > 5.0% | 5 ÷ 80 × 100 = 6.25% → flagged |
* Density benchmarks are approximate guidelines. Actual optimal density varies by content type, topic, competition level, and writing style. Use as a review signal, not a fixed target.
Frequently Asked Questions
What is a keyword density checker?
A keyword density checker is a text analysis tool that measures how frequently each word appears in a piece of content and expresses it as a percentage of the total word count. For example, if the word 'SEO' appears 8 times in a 400-word article, its keyword density is 2%. This tells you whether a term is used proportionally — enough for topical clarity, but not so often that it reads as forced repetition.
What is a word density checker?
A word density checker and a keyword density checker are the same type of tool — both measure how often each individual word appears relative to the total word count, expressed as a percentage. Word density is the broader term covering all words in the text; keyword density typically refers to the density of SEO target terms. This tool functions as both: it analyzes every word's density and lets you isolate specific target keywords for focused tracking.
Can this tool detect keyword stuffing?
Yes. The keyword stuffing checker functionality flags any word with a density above 5% as potentially overused. Keyword stuffing — repeating a term unnaturally often to manipulate search rankings — typically shows up as densities of 6 to 15% or higher. The flag is a review trigger: paste your text, look for flagged terms, read the surrounding sentences, and decide whether the repetition is natural or mechanical. Google penalizes content where keyword stuffing is detectable to a reader.
How is keyword density calculated?
Keyword density is calculated by dividing the number of times a keyword appears by the total number of words in the text, then multiplying by 100. The formula is: Density (%) = (Keyword Count / Total Word Count) x 100. This tool applies that formula to every word in your text simultaneously and displays the results ranked by frequency.
What is a good keyword density for SEO?
There is no universally accepted ideal percentage, and Google has confirmed that keyword density is not a direct ranking factor. Most SEO practitioners treat 1-3% as a natural range for a primary keyword — dense enough to signal topical relevance, light enough to read naturally. This tool flags any term above 5% as potentially overused so you can review it, but whether to reduce it depends on context and readability, not a hard rule.
What is the difference between keyword density and keyword frequency?
Keyword frequency is the raw count of how many times a word appears — for example, 12 occurrences. Keyword density is that count expressed as a proportion of the total word count — for example, 12 occurrences in a 600-word article equals a 2% density. Frequency tells you the absolute count; density tells you the weight of that word relative to everything else in the text. Both metrics are shown in this tool's results table.
Should I use stop-word filtering when analyzing content?
For SEO keyword analysis, yes — enabling stop-word filtering almost always produces more useful results. Without it, common words like 'the,' 'is,' 'and,' and 'of' will dominate the results table, making it harder to see the meaningful keywords underneath. Turn filtering on to surface the content terms that actually contribute to topical relevance. Turn it off only when you specifically need to audit the full word distribution, such as checking readability or writing style.
Can I track specific target keywords?
Yes. Add one or more target words or phrases, such as keyword density checker, in the Target keywords field. Each target gets its own row with the number of whole-word matches, its density and a note if it was not found. Matches never span two sentences.
What does the overuse highlight mean?
Any word with a density above 5% is flagged in the results table as potentially overused. This threshold is a review trigger, not a penalty indicator — it means the word appears frequently enough that you should read the surrounding sentences and judge whether the repetition sounds natural. If it reads fine, no change is needed. If it sounds mechanical, consider synonyms or restructuring a few sentences.
Can I export keyword density results?
Yes. Results can be exported as CSV for spreadsheet analysis and reporting, or as JSON for integration with content workflows and developer tools. The export includes each word, its count, and its density percentage — ready for client reports, content audits, or bulk comparisons across multiple pages.
Does case-sensitive mode change the analysis?
Yes, meaningfully. In default (case-insensitive) mode, 'SEO,' 'seo,' and 'Seo' are all counted as the same word. In case-sensitive mode, each variation is counted separately. This matters when your content contains proper nouns, brand names, or acronyms where capitalization carries distinct meaning.
Is my text private when using this tool?
Yes. We do not collect or store what you enter. This means you can safely paste unpublished drafts, client content, or proprietary documents.
Does it check two- and three-word phrases?
Yes. Switch to the 2-word or 3-word tab to see the phrases you repeat, such as project management or keyword density checker. With stop words ignored, phrases that start or end with a word like the, of or and are skipped, and only phrases used at least twice are listed.
How is phrase density calculated?
The same way as for single words: the number of times the phrase appears divided by the total number of words, times 100. A three-word phrase used 4 times in an 800-word article has a density of 0.5%.
Related Tools
Word Counter
Count words, characters, sentences, paragraphs, and reading time.
Word Frequency Counter
Analyze word counts, percentages, and repeated terms in text.
Reading Time Calculator
Estimate read and speaking duration with multi-speed profiles, custom WPM, and badge-ready output.
Paragraph Formatter
Clean text by fixing spaces, line breaks, and paragraph structure.
Text Reverser Tool
Reverse letters, words, sentences, or paragraph order instantly.
Text to Clipboard Copy
Copy one or multiple text blocks in plain, HTML, or Markdown format.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words with copy and download support.
Markdown Previewer
Live Markdown editor with GitHub tables and task lists, and HTML export.
Remove Duplicate Lines
Deduplicate line-based text with case, whitespace, and sort controls.
Find and Replace
Search and replace text with regex, batch rules, and preview controls.
Text Diff Checker
Compare text versions by line, word, or character with visual diff output.
Bionic Reading Converter
Bold the first letters of every word, Bionic Reading style.