Keyword Density Checker
Count word occurrences and calculate occurrence rates in article text or web pages
Features
Works with both text and URLs
Analyze pasted text or web page content from a URL
Specify multiple target keywords
Check occurrence counts and rates for your keywords at the top of the list
Filter by part of speech
Choose from nouns only, nouns + verbs + adjectives, or all words
Export via copy or CSV
Output all results and use them for related keyword research
How to Use
Choose input method and enter data
Paste article text or enter one page URL
Enter target keywords
Write keywords one per line (optional, max 10)
Check occurrence rates
Run the tool to see your keywords' occurrence rates and word list
Filter by part of speech and export
Switch part of speech filter as needed, then copy or export as CSV
Use Cases
Review articles before publishing
Verify target keywords numerically in your draft
Analyze competitor pages
Enter top-ranking page URLs to discover frequently used words
Compare before and after rewriting
Compare occurrence rates in the same article to identify wording biases
Verify related keywords are included
Check how much your collected related keywords appear in the content
Knowledge Base
What is keyword occurrence rate? (Formula and benchmarks)
Keyword occurrence rate is the percentage a specific keyword represents of the total word count in a text. The formula is: (keyword occurrences ÷ total word count) × 100. For example, a keyword appearing 20 times in a 1,000-word document has a 2.00% occurrence rate.
What happens if occurrence rate is too high?
Excessive keyword repetition makes text unnatural and difficult to read, causing readers to leave. Occurrence rate is not a ranking factor—use it only to compare your article with top-ranking pages. Prioritizing natural, readable content is essential.
What is morphological analysis? (How word boundaries work)
Morphological analysis breaks text into meaningful units (morphemes) and identifies their parts of speech. Since Japanese has no spaces between words, analysis uses a dictionary to segment text like "search/ranking" to enable counting specific parts of speech like nouns only.
Safety & Privacy
Server-side processing
Input is processed on the server; only information necessary for the inquiry is sent.
Temporary processing only
For Retrieve content from URL, temporary processing occurs on the server, then data is discarded after results are returned.
Communications encrypted with HTTPS
All sent and received data is encrypted by TLS and cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
Pasted text is not sent to servers
Text analysis runs in your browser. Only the URL you specify is sent to the server.
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Updates
- update #383
Added keyword density checker. Displays word frequency in body text and URLs
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.