If you want to know whether your content uses your target keyword the right amount — not too little, not too much — you need to check keyword density online. This guide shows you exactly how to do it in under a minute using a free tool, what the results mean, and how to act on them to improve your SEO without over-optimising.
What Is Keyword Density?
Keyword density is the percentage of times a specific word or phrase appears in a piece of content relative to the total word count. It is calculated as:
Keyword Density = (Number of times keyword appears ÷ Total word count) × 100
For example: if your article is 1000 words long and your target keyword "SEO tools" appears 15 times, the keyword density is 1.5%.
Keyword density matters for SEO because it helps search engines understand what your page is about. If your keyword never appears, Google may not associate your page with that topic. If it appears excessively, Google may flag it as keyword stuffing — a spam practice that results in ranking penalties.
The goal is a natural density that signals topical relevance without triggering spam filters.
How to Check Keyword Density Online Free
The fastest way is to use our free keyword density checker — no account, no signup, no cost. Here is the step-by-step process:
Step 1: Open the tool
Go to searchranktool.com/keyword-density-checker. No login required.
Step 2: Paste your content
Copy your entire article or page content and paste it into the text area. Include everything — headings, body text, and any other visible text on the page. Do not include HTML code, just the plain text content.
Step 3: Enter your target keyword
Type the exact keyword or phrase you are targeting in the keyword field. Use the same form your audience would search for it — if you are targeting "keyword density checker", enter that exact phrase, not just "keyword" or "density".
Step 4: Click Analyse
The tool instantly calculates:
- The density percentage of your target keyword
- The number of times it appears
- Your total word count
- A breakdown of the most frequent words and phrases across your content
Step 5: Read the results
Compare your keyword density against the ideal range (covered in the next section) and make adjustments to your content as needed.
The entire process takes under 60 seconds. You can run it as many times as you like — paste an updated version of your article after making changes to see the new density.
What Numbers to Aim For
The widely accepted best practice for keyword density in 2026 is:
- Primary keyword: 1–2% — appearing roughly once every 50–100 words
- Secondary keywords: 0.5–1% each — appearing a few times naturally throughout
- LSI / related terms: naturally throughout — no specific target, just write naturally
These are guidelines, not strict rules. Google's ranking systems are sophisticated enough to understand context and synonyms — a page about "keyword density" will naturally include terms like "keyword frequency," "word count," and "SEO," and Google understands these are all related.
The most important thing is that your keyword appears:
- In the first 100 words of the article
- In at least one H2 heading
- Naturally throughout the body text
- In the meta title and meta description
If those four conditions are met and your density is between 0.5% and 2.5%, you are in good shape.
What to Do If Density Is Too Low
If your keyword density is below 0.5% — your keyword barely appears in the content — here is how to fix it without forced, unnatural writing:
1. Add it to your introduction — your keyword should appear in the first paragraph. If it is not there, rewrite the opening sentence to naturally include it.
2. Add a heading that includes the keyword — create or rename an H2 section to include your keyword phrase. For example, if your keyword is "keyword density checker," a section headed "How a Keyword Density Checker Works" adds a natural instance.
3. Add examples that use the keyword — if you are writing about "keyword density," give a worked example using the phrase: "For instance, if you run a keyword density check on a 500-word article..."
4. Expand thin sections — if your article is under 800 words and the density is low, the article is probably too short overall. Expanding it to cover the topic more thoroughly will naturally add keyword instances.
Avoid: copying and pasting the keyword into existing sentences where it does not fit naturally. Google's algorithms detect unnatural keyword insertion.
What to Do If Density Is Too High
If your keyword density is above 3%, you are at risk of being seen as keyword stuffing. Common causes and fixes:
Replace some instances with synonyms — instead of "keyword density checker" every time, use "this tool," "keyword frequency analyser," "the checker," or simply "it." Google understands these refer to the same concept.
Remove forced mentions — identify sentences where the keyword appears but adds no new information. Delete or rewrite those sentences.
Increase total word count — adding more content on related subtopics dilutes the density of the primary keyword without removing any instances. A 2000-word article with 20 keyword mentions has 1% density; a 500-word article with the same 20 mentions has 4%.
Check headings — if your keyword appears in multiple consecutive H2 or H3 headings, rewrite some of them to use variations instead.
Checking Secondary Keywords
A well-optimised article targets more than one keyword. After checking your primary keyword density, run the same check for your secondary keywords — related terms and phrases your article should also rank for.
For a post targeting "keyword density checker," secondary keywords might include:
- "keyword frequency" — aim for 0.5–1%
- "word count" — aim for 0.5–1%
- "SEO content optimisation" — aim for 0.3–0.7%
The word frequency table our keyword density checker produces shows the most frequent words and phrases in your content — this is your secondary keyword report. Scan it to ensure your most important supporting terms appear at meaningful frequencies.
You can also cross-reference this with Google's "People Also Ask" boxes and "Related Searches" at the bottom of the search results page for your primary keyword. Any terms appearing there that are missing from your content are worth adding.
For further content optimisation, run your article through our readability checker after adjusting keyword density — content that reads naturally tends to have healthy keyword distributions by default.
Frequently Asked Questions
What is the best free tool to check keyword density online?
Our keyword density checker at SearchRankTool is completely free with no signup required. Paste your content, enter your keyword, and get instant density results including word count, keyword frequency, and a word frequency table. It works for any language and any content length.
How often should I check keyword density?
Check keyword density before publishing any new piece of content, and again after making significant edits. If a post is not ranking as expected after 2–3 months, check keyword density as part of your content audit — it may be too low for Google to associate the page with the target keyword, or so high it is being filtered as spam.
Does keyword density still matter for SEO in 2026?
Yes, but not as a rigid formula. Google has evolved beyond counting keyword percentages, but keyword presence still matters for relevance signals. A page with zero or near-zero instances of its target keyword will struggle to rank for it. The goal is natural, relevant usage — not hitting a specific percentage target. The 1–2% guideline is a useful health check, not a magic number.
Can I check keyword density for a URL instead of pasting text?
Our current tool analyses pasted text rather than crawling URLs directly. To check a live page, use your browser's "View Page Source" or copy the visible text from the page and paste it into the tool. This approach also lets you check only the body content, excluding navigation and footer text that would skew the results.