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Analyze word frequency, keyword density, top keywords, and repeated or duplicate sentences directly in your browser.
You can also drop a TXT, MD, or CSV file anywhere in this workspace.
Local processing · No server upload · Service limit: 300,000 characters · 30,000 sentences · 50,000 unique keywords
HOW TO USE
Paste an article, draft, or product description into the input area.
Choose Analyze to calculate total words, unique words, and sentence count.
Review top keywords with occurrence counts and density percentages.
Check repeated and duplicate sentence groups with occurrence positions.
Use Clear all to fully reset the source and analysis results.
EXPERT POST
Density is the occurrence count of a keyword divided by the total analyzable word count. The same count can produce a different density in a longer document, so frequency and percentage should be read together.
No fixed density percentage can guarantee visibility or ranking. This tool uses density only as an observation metric for repeated wording, not as an SEO score.
Supported browsers prefer Intl.Segmenter for locale-aware word boundaries. This matters especially for Japanese, where a simple whitespace split can incorrectly treat a long sentence as one word.
Apple, apple, and APPLE are counted as the same keyword by default. A deterministic representative form is displayed so the same input produces stable results and ordering.
Comparison trims outer whitespace and collapses repeated internal whitespace, while the displayed sentence preserves the original source. This catches formatting-only duplicates without hiding the actual text.
When multiple keywords have the same count, the keyword that appears first in the document ranks first. This keeps ranking deterministic instead of depending on arbitrary object or locale sorting.
Punctuation-only tokens and emoji are excluded from the default keyword count. If no analyzable words remain, totals and density stay at zero so NaN or Infinity never appears.
Pasted text, keyword lists, duplicate sentences, and positions are not sent to external AI or SEO APIs. Analysis is performed in the current browser memory only.
IMPORTANT NOTES
FAQ
Occurrences of a keyword are divided by the total analyzable word count and multiplied by 100.
Outer whitespace is trimmed and consecutive internal whitespace is collapsed for comparison; a sentence appearing at least twice becomes a duplicate group.
Yes. Supported browsers use Intl.Segmenter for Japanese word and sentence segmentation.
No. Analysis happens only in the current browser memory.
No. Frequency and density are observation metrics for repetition inside the document, not search-ranking guarantees.