How to Extract SEO Keywords Online
Discover ranking entities in four simple steps:
Paste Content
Paste blog articles, landing page copy, or competitor text.
Filter Minimum Freq
Set minimum occurrences to filter out one-off mentions.
Analyze N-Grams
Review 1-gram keywords alongside 2-gram and 3-gram key phrases.
Export CSV
Export discovered keywords directly into Google Sheets or Excel.
Key Features & NLP Keyword Analysis
Multi-Gram Extraction
Extracts single terms, 2-word bigrams, and 3-word long-tail entities.
Exact Density Percentages
Calculates mathematically accurate density percentages for SEO audits.
Stop Word Cleanser
Filters out 100+ common filler words to highlight only high-signal nouns and verbs.
100% In-Browser Privacy
Unpublished articles and proprietary research remain strictly on your machine.
Sub-Second Execution
Analyzes thousands of words in a few milliseconds without API rate limits.
1-Click CSV Export
Copy structured CSV tables ready for paste into spreadsheets.
The Role of Semantic Entities in Modern SEO
Google's ranking algorithms have evolved beyond exact-match keywords to evaluate topical completeness and semantic entity relationships. Extracting key phrases from top-ranking articles helps writers ensure their copy covers all critical subtopics without keyword stuffing.
Nextgen Astra AI Keyword Extractor provides a fast, privacy-friendly SEO assistant for bloggers and content strategists.
Comparison Matrix
| Feature | Nextgen Astra | Surfer SEO / Clearscope | Online Word Clouds |
|---|---|---|---|
| Cost | 100% Free Forever | $89 - $199 / month | Free (Limited) |
| N-Gram Phrase Extraction | 1, 2 & 3-Grams | Included | Single Words Only |
| Privacy Guarantee | 100% In-Browser | Cloud Logged | Ad Trackers |
| CSV Export | 1-Click Clipboard | Export File | None |
Frequently Asked Questions
?How does the AI Keyword & Entity Extractor work?
The tool tokenizes text, filters linguistic stop words, and computes n-gram word co-occurrences (1-gram single words, 2-gram bigrams, and 3-gram trigrams) to measure keyword frequency and density percentages.
?What is Keyword Density in SEO?
Keyword density represents how frequently a search term appears relative to total document words. Ideal density for primary target keywords typically ranges from 1% to 2.5% to avoid search engine keyword stuffing penalties.
?Can I export the extracted keywords to CSV?
Yes! Click 'Export CSV' to copy a formatted comma-separated table of keywords and densities directly to your clipboard.
?Is my proprietary article or confidential copy safe?
Yes! 100% of keyword extraction and NLP counting happens locally in your browser memory.
?Is this keyword extractor free with no limits?
Yes! 100% free with unlimited document analysis and zero account sign-up.