Keyword Density Checker
Instantly check the density of one or more keywords in your text. See exact counts, percentages, visual bars, and a live preview with highlighted matches. Toggle partial matching and get color‑coded density badges. Perfect for SEO optimization, content auditing, and avoiding keyword stuffing. Everything runs privately in your browser — no signup, no uploads.
Why use this Keyword Density Checker?
Keyword density is a classic SEO metric that shows how often a keyword appears relative to the total word count. While modern search engines rely on context and semantics, density still offers a quick snapshot of your content's focus. This tool lets you check multiple keywords at once, compare their prominence with visual bars, highlight them in a live preview, and get color‑coded density badges (green = safe, yellow = watch, red = over‑optimized).
- Live highlighting – keywords are instantly highlighted in the preview, so you can see their distribution.
- Partial matching – optionally count a keyword even when it's part of a larger word (e.g., "SEO" in "SEOptimization").
- Color‑coded density – green (<2%), yellow (2‑3%), red (>3%) badges help you quickly assess each keyword.
- Multi‑keyword support – separate keywords by commas to analyze them all at once.
- 100% private – all counting happens locally in your browser; your text is never uploaded or stored.
How does the tool calculate keyword density?
The Keyword Density Checker uses regular expressions to count exact or partial matches of your target keywords. First, it splits your entire text into individual words based on word boundaries (spaces, punctuation). Then for each keyword you entered, it scans the text using the selected options:
- Case‑sensitive search – if enabled, "SEO" and "seo" are treated as different words. Disabled by default.
- Partial matches – when turned on, the keyword "run" will also count inside "running" or "runner". When off, only whole‑word occurrences are counted.
- Density formula – density = (number of keyword occurrences ÷ total words) × 100. The result is displayed as a percentage with one decimal place.
The tool also highlights every match directly in a live preview, so you can see exactly where each keyword appears without any guesswork.
Who needs a Keyword Density Checker?
SEO Specialists
Audit on‑page content, identify over‑optimized pages, and ensure target keywords appear at a healthy frequency.
Content Writers
Check whether your primary keyword is repeated enough (or too much) before publishing.
Marketing Teams
Compare multiple landing pages or blog posts to align with your content strategy.
Students & Researchers
Analyze term frequency in essays, theses, or any academic document.
How to check keyword density (step‑by‑step)
1. Paste your text
Drop any block of text — an article, blog post, or page copy — into the input box.
2. Enter keywords
Type one or more keywords separated by commas (e.g. "SEO, content writing, optimization").
3. View highlights & table
Matches are instantly highlighted. The table shows counts, density percentages, and color badges.
4. Export results
Copy the table or download a CSV file for further analysis and reporting.
Example: before and after
| Input text | Keyword Density (keywords: SEO, content, writing) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SEO is important for content writing. Good content needs solid SEO. Writing for SEO requires strategy. |
|
Common use cases
- On‑page SEO audits: Quickly check if your target keywords appear often enough without crossing into stuffing.
- Content planning: Compare density across multiple articles to maintain a consistent keyword strategy.
- Competitor analysis: Paste a competitor's text to see what keywords they emphasize.
- Academic writing: Track term frequency to ensure important concepts are covered adequately.
- Ad copy testing: Measure keyword repetition in PPC headlines and descriptions.
Pro tips for better keyword density analysis
- Aim for a natural density – generally 1‑2% for primary keywords, but always prioritize readability over numbers.
- Toggle "Partial matches" to include keywords that appear inside other words (e.g., "run" in "running").
- Use the live preview to visually confirm where your keywords are concentrated.
- Color badges: green (<2%) = likely safe, yellow (2‑3%) = worth reviewing, red (>3%) = high risk of keyword stuffing.
- Combine with our Keyword Counter for a full frequency breakdown of all words.