The Best Free Keyword Density Checker Tools 2021

Staff Writer
Last Updated
February 9, 2024
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Keywords will always be a key part of SEO because search engines like Google and Bing use them to judge the relevance of the content on your website. 

Figuring out the right amount of keywords to include on your webpage — now, that's the tricky part. Use too little and your page will have trouble ranking. Use too much and your website might be penalized. 

Thankfully, finding the optimal keyword density for your webpage doesn't have to be difficult. Cue in keyword density checker tools.

What is a Keyword Density Checker?

A Keyword Density Checker is a tool used to measure how often a keyword or phrase is used on a web page compared to the total number of words used on the same page.

How Can They Help Your SEO Performance?

Keyword density checker tools help improve on-page SEO by determining the relevance of the content on your webpage to a web user's search intent query. With this data, you can ensure that your page is not vulnerable to blackhat SEO penalties.

Curious about how your competitors are doing on the SEO front? A Keyword Density Checker is a great tool for spying on the competition — all you need is a URL link. 

Interested but unsure about which keyword density tool to use? Check out our top 10 free keyword density checker tool list below:

The Best Free Keyword Density Checker Tools 2021

1.Small SEO Tools

SmallSEOTools offers one of the easiest keyword density tools to use on this list. The interface is uncluttered, making navigation a breeze!

This keyword density checker has two search options: text and URL. You can either analyze a complete content piece before it is published or a published web page via its URL. Regardless of the option you choose, you'll be able to find the percentage of your keyword density volume along with the number of keywords on the page, the cloud tag, load time, and more.

2. PREPOSTSEO - Keyword Density Checker  Tool

The PrePostSeo keyword density checker tool has a unique feature that the other tools on this list don't. In addition to having a URL or Paste Text option, the Prepostseo keyword density tool also includes a feature for calculating the keyword frequency in your content when a Doc, PDF, Txt, or Docx file is uploaded.  All for free! 

3. SEOBook - Keyword Density Analyzer 

SEOBook is very similar to Small SEO Tools and some other keyword density tools on this list. You will find a URL and text option on the website to check the keyword density of your content.

Besides analyzing the keyword density on your webpage, SEOBook also offers features that will help with your overall SEO strategy. For example, you can track Google results for over 120 million keywords and look for historical penalties and other potential ranking issues. 

4. DupliChecker 

This keyword density tool offered by DupliChecker will help you identify keyword density errors in your content so that you can make the necessary corrections. 

To use this keyword density tool, you need to enter a valid URL and highlight the elements to be included. Alternatively, you can enter a block of text,  set your preferences, then click  “Analyze” to run a search. The keywords with the highest density will be at the top of the list.

5. GeoRanker 

The GeoRanker keyword density tool calculates the optimal value of the keyword density on a webpage. To access the full features of this keyword density tool, you will need to subscribe to a paid plan. However, there is a free 7-day trial offer that you can take advantage of. 

6. I.MNinja's Keyword Density Analysis Tool

With the I.MNinja's keyword density analysis tool you can run a keyword analysis of an existing page on your website or a competitor's site.

To use the keyword density analysis tool by IMNinja, simply paste or type a full URL in the text box, and then click "Ninja Check". You'll get a detailed report with the number of non-linked words, linked words, most commonly used keywords, and usage frequency count for each phrase or keyword. 

7. Add Me - Keyword Density Tool

One of the highlights of the Add me keyword density tool is its "intuitive density report". There are also advanced options that allow you to analyze Meta Descriptions, Meta Tag Keywords, and more.

What to do with the report is your prerogative. You can save the reports as a .csv file for future references, or open a new window for an expanded report of the density volume of keywords on a webpage. 

8. AppSpot - Live Keyword Density Analysis Tool

New to SEO? This tool is for you!  

The AppSpot keyword density analysis tool is a one-page density calculator with no bells and whistles. Just type in your keywords and paste your text, the Live keyword density analyzer will take care of the rest automatically. 

We like that you can edit your content within the text box, and get on-the-go-live keyword density results.

9. Pingler - Keyword Density Tool

The Pingler keyword checker scans the webpage for keywords and how often they occur. Results are grouped into one, two, and three-word keyword lists and prioritized by keyword density.

You can also analyze the keyword density on a webpage to see how search engines rate content or research keyword trends on a competitor's site. 

10. SEO Chat Keyword Density Tool

This keyword density analytics tool provides you with a keyword density report of both non-linked and linked keywords. You can also use this tool to dive deep into a webpage and do a proper analysis of keyword usages. 


While taking pointers based on the results of these free keyword density tools is good, the best way to ensure the success of your SEO efforts is to have a custom SEO strategy for your specific business needs. 

Get in touch with our SEO company for a free SEO consultation.

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