Keyword Density Checker is a free SEO tool that helps you analyze how often a keyword appears in your content and whether it is optimized correctly for search engines.
Instead of guessing keyword usage, this tool provides real data such as keyword count, density percentage, SEO score, and suggested primary & secondary keywords based on your actual content.
Paste your content into the tool below and analyze it instantly.
Keyword Density Checker
What Is Keyword Density?
Keyword density refers to the percentage of times a target keyword appears in your content compared to the total number of words.
Formula:
(Keyword count / Total words) × 100
For example, if an article has 1,000 words and the keyword appears 15 times, the keyword density is 1.5%.
Keyword density is not a direct ranking factor, but improper usage can make content look unnatural or irrelevant to search engines.
Ideal Keyword Density for SEO
- 0.8% – 2.5% → Safe and natural
- Below 0.5% → Keyword may be under-optimized
- Above 3.5% → Risk of keyword stuffing
This tool automatically evaluates your keyword usage and provides a clear SEO score, so you don’t have to guess.
How This Keyword Density Checker Works
Unlike basic keyword counters, this tool analyzes your content in multiple layers:
- Total word count
- Keyword occurrences and density
- SEO score (0–100)
- Primary keyword suggestion
- Secondary keyword suggestions (2–3 word phrases)
- Internal linking keyword ideas
- Highlighted keywords inside your content
All analysis is performed directly in your browser. Your content is not stored or sent to any server.
How to Use the Tool
- Enter your target keyword
- Paste your article content
- Click Analyze
- Review keyword density, SEO score, and keyword suggestions
- Adjust your content if needed
You can click any suggested keyword to copy it instantly.
Primary vs Secondary Keywords Explained
Primary keyword is the main phrase that best represents your content topic and appears naturally throughout the article.
Secondary keywords are related phrases that support the main topic and help search engines better understand the context of your content.
This tool only suggests keyword phrases that actually appear in your content, avoiding irrelevant or low-quality keyword ideas.
Why Keyword Density Still Matters in 2025
Even with modern NLP and semantic search, keyword density still plays an important role in SEO:
- Helps search engines understand topic relevance
- Prevents under-optimized content
- Avoids over-optimization penalties
- Improves content readability and user experience
Smart SEO is not about stuffing keywords — it’s about balanced, natural usage.
Frequently Asked Questions
Is keyword density a ranking factor?
Not directly, but improper keyword usage can negatively impact rankings.
What is a good SEO score?
A score above 70/100 usually indicates healthy keyword optimization.
Can I use this tool for long-form content?
Yes. It works especially well for blog posts, pillar pages, and long articles.
Is this keyword density checker free?
Yes. The core features are completely free to use.
Related SEO Tools by TechDecoded
Before or after analyzing keyword density, make sure your content length meets SEO best practices.