Keyword Density Analyzer

📖 About this tool

Keyword density is the share of a word in the total word count of a text, a common reference for judging whether a page over-uses a keyword. The tool tokenises Chinese with a sliding window of one to four characters and merges short words contained in longer phrases, splits English into words, and counts occurrences and density share, sorted highest first. You can set the maximum word length, minimum occurrence count, number of rows and scope, filter Chinese and English stop words, and lowercase English. Everything is computed locally in the browser and no text is uploaded. Typical uses include checking whether an article over-stuffs keywords, comparing word emphasis against competitor pages, extracting core terms from long copy, and providing a frequency basis for rewriting. Results can be copied or exported as CSV for further analysis.

✨ Features

• Chinese and English tokenisation：Sliding-window 1–4 character Chinese terms, English split by word, counted separately
• Stop-word filtering：Built-in Chinese and English stop-word lists remove meaningless high-frequency words
• Short-word merging：Short terms contained in longer phrases are dropped so "key" and "keyword" are not double-counted
• Density share：Shows both occurrence count and percentage of total words, with bars for comparison
• CSV export：Copy or export as BOM-prefixed CSV that opens correctly in Excel
• Paste or sample：Paste straight from the clipboard, or load a sample text to try it

🚀 How to use

1. Type or paste the text;
2. Set word length and filters;
3. Click Analyse;
4. Copy results or export CSV.