Top 10 Keyword Density Checker Tools You Should Use Every Day in 2025

Introduction

If you’re into blogging, SEO, or digital marketing, you’ve probably heard countless times that “keywords are the backbone of SEO.” But here’s the tricky part: using too many keywords can look spammy, and using too few can make your content invisible to search engines. So how do you strike the perfect balance?

That’s where keyword density checker tools come in. These handy tools scan your content and show you how often your target keywords appear, ensuring you maintain that sweet spot where your content is both search-engine-friendly and reader-friendly.

In 2025, with Google’s algorithms becoming more sophisticated, writing content naturally while still optimizing for SEO is more important than ever. Users (like you and me) don’t just want to rank high; we want to make sure our content sounds natural, engaging, and valuable to readers. That’s why using the right keyword density checker can make all the difference.

The best part? You don’t have to spend thousands on expensive SEO suites to analyze keyword density. Some free tools, like the one we provide at freetoolr.com, do the job perfectly. Let’s dive into the top 10 keyword density checker tools you should be using every day in 2025.

#1: Our Tool – Keyword Density Checker (freetoolr.com)

Link: Keyword Density Checker

If you’re looking for a simple, effective, and 100% free keyword density checker, then our tool at freetoolr.com is your best friend. Unlike bulky SEO platforms, this tool is lightweight and easy to use, making it perfect for bloggers, students, freelancers, and digital marketers who want quick results without dealing with complicated dashboards.

The tool works by analyzing any text you paste (or even full web pages) and provides a breakdown of keyword frequency and percentage usage. This helps you adjust your content instantly so you never risk keyword stuffing or under-optimization.

Features

• Instantly checks keyword frequency and density.

• Works with both raw text and web page URLs.

• Easy-to-read results (no confusing charts or jargon).

• Mobile-friendly interface.

• Zero sign-up required.

Pros

• 100% free for life.

• No login or account creation.

• Fast and accurate results.

• Clean, user-friendly interface.

Cons

• Doesn’t include advanced competitor analysis (like paid SEO tools).

• Focused only on keyword density (not a full SEO suite).

Pricing

Completely free forever.

#2: SEMrush (https://www.semrush.com)

Visit Website: SEMrush

SEMrush is one of the giants in the SEO world, and while it’s primarily known for keyword research, competitor tracking, and backlink analysis, it also offers keyword density analysis as part of its content optimization toolkit.

With SEMrush, you don’t just check keyword frequency—you also get actionable suggestions on how to make your content rank better. For serious SEO professionals, it’s a powerhouse.

Features

• Built-in keyword density checker in the SEO Writing Assistant.

• Competitor analysis and keyword gap insights.

• On-page SEO recommendations.

• Integration with Google Docs and WordPress.

Pros

• Covers far more than just keyword density.

• Trusted by professionals worldwide.

• Excellent for agencies and large teams.

Cons

• Expensive for solo bloggers.

• Can feel overwhelming for beginners.

Pricing

• Plans start at $129.95/month.

• Free trial available.

#3: Ahrefs (https://ahrefs.com)

Visit Website: Ahrefs

Ahrefs is another heavyweight SEO platform that includes a keyword density checker within its Site Audit and Content Analysis features. It’s particularly useful for identifying keyword stuffing risks and ensuring your content stays natural.

Features

• Keyword density reports.

• Comprehensive site audit.

• SERP analysis and keyword rankings.

• Backlink tracking and competitor insights.

Pros

• Reliable and accurate data.

• Perfect for in-depth SEO campaigns.

• Great for agencies and advanced users.

Cons

• Steeper learning curve.

• Pricey for small bloggers.

Pricing

• Starts at $99/month.

• No free plan.

#4: Yoast SEO Plugin (https://yoast.com)

Visit Website: Yoast SEO

If you’re running a WordPress site, chances are you’ve already come across Yoast SEO. One of its built-in features is a keyword density checker that automatically analyzes your content as you write.

Features

• Real-time keyword density check.

• SEO readability analysis.

• Internal linking suggestions.

• Meta description and title optimization.

Pros

• Direct integration with WordPress.

• Beginner-friendly.

• Covers multiple SEO aspects in one plugin.

Cons

• Limited functionality in the free version.

• Best suited only for WordPress users.

Pricing

• Free version available.

• Premium starts at $99/year.

#5: Small SEO Tools – Keyword Density Checker (https://smallseotools.com)

Visit Website: Small SEO Tools

Small SEO Tools offers a free, easy-to-use keyword density checker. It’s ideal for people who want quick insights without creating an account or paying for premium features.

Features

• Free keyword density analysis.

• Upload content or paste a URL.

• Lists keyword count, frequency, and percentage.

Pros

• 100% free.

• Very quick and straightforward.

• No sign-up required.

Cons

• Basic results only.

• Ads can feel distracting.

Pricing

• Free forever.

#6: SEO Review Tools (https://seoreviewtools.com)

Visit Website: SEO Review Tools

SEO Review Tools offers a powerful keyword density checker that is both free and professional-grade. It’s a hidden gem for marketers who want more depth than the usual free tools.

Features

• Keyword frequency, density, and variation reports.

• Option to analyze full web pages.

• On-page SEO checks.

Pros

• More advanced than many free tools.

• Reliable and ad-free.

• Great for freelancers and bloggers.

Cons

• Limited compared to paid platforms.

Pricing

• Free to use.

#7: WebFX Keyword Density Checker (https://www.webfx.com/tools/keyword-density/)

Visit Website: WebFX

WebFX provides a free tool that quickly calculates keyword usage across your content. It’s backed by one of the leading digital marketing agencies, so you can trust its accuracy.

Features

• Fast keyword frequency reports.

• Clean, ad-free tool.

• Works with URLs and text.

Pros

• Completely free.

• Reliable and agency-backed.

• No cluttered interface.

Cons

• No advanced SEO features.

Pricing

• Free forever.

#8: Copywritely (https://copywritely.com)

Visit Website: Copywritely

Copywritely is a content optimization tool that includes keyword density analysis alongside readability, plagiarism, and grammar checks. It’s perfect for writers who want to refine their content for SEO and style simultaneously.

Features

• Keyword density checker.

• Readability and grammar analysis.

• Duplicate content detection.

Pros

• All-in-one writing assistant.

• Great for copywriters and content creators.

Cons

• Limited free usage.

• Not as advanced for SEO as SEMrush or Ahrefs.

Pricing

• Plans start at $18/month.

• Free trial available.

#9: PrepostSEO Keyword Density Checker (https://www.prepostseo.com)

Visit Website: PrepostSEO

PrepostSEO is another free platform offering multiple SEO tools, including a keyword density checker.

Features

• Keyword density analysis.

• Supports text input and URLs.

• Additional tools like plagiarism checker.

Pros

• Free to use.

• Wide range of SEO tools in one platform.

Cons

• Ads can be intrusive.

• Basic interface.

Pricing

• Free plan available.

• Premium plans start at $10/month.

#10: TextRazor (https://textrazor.com)

Visit Website: TextRazor

TextRazor is more of a linguistic analysis tool, but its keyword frequency and density features are incredibly detailed. Perfect for technical SEO enthusiasts who love data.

Features

• Advanced keyword and entity analysis.

• Semantic SEO insights.

• Supports large documents.

Pros

• Extremely detailed reports.

• Great for data-driven SEO.

Cons

• Not beginner-friendly.

• Requires some learning.

Pricing

• Free plan available.

• Paid plans start at $79/month.

Comparison Table

Conclusion

Keyword density may sound like a small thing, but it’s one of the cornerstones of good SEO writing. Use too many keywords, and you risk penalties; use too few, and your content won’t rank. That’s why tools like Keyword Density Checker are so important in 2025.

If you’re just starting out, or you want a fast, free, and reliable keyword density tool, head over to freetoolr.com and give our tool a try. It’s free forever, requires no sign-up, and helps you fine-tune your writing in seconds.

👉 Start using Keyword Density Checker today and simplify your SEO workflow without spending a single rupee.

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