Extract Keywords from Any Document Instantly — Powered by AI
Stop guessing which words matter. Plainscan's AI Keyword Extractor reads your document and surfaces the most important terms, topics, and phrases — ranked by relevance. Upload a Word file, PDF, or paste your text, and get a clean keyword list in seconds. No SEO expertise required. No software to install. Just upload and extract.
Drop your file here
or click to browse from your computer • Max 50 MB
Supported: DOC,DOCX
What this tool does
When to use it
How to use
Upload your file
Adjust settings if needed
Download your result
Extract SEO Keywords from Articles & Reports
Identify the most relevant terms for your search engine optimization strategy. Quickly find prominent names, locations, and concepts within any piece of long-form content.
Tag and Categorise Documents by Topic
Improve the organization and searchability of your document library. Use AI-extracted keywords to automatically tag and index large collections of research and documentation.
What Is an AI Keyword Extractor?
An AI keyword extractor is a tool that uses artificial intelligence — specifically natural language processing (NLP) and large language models (LLMs) — to analyze the text of any document and identify its most significant words and phrases. Unlike traditional word-frequency counters that simply tally how many times a word appears, AI-powered extraction understands context and meaning. It knows that "machine learning" in a technical report is more significant than the word "the," even if "the" appears 500 times more.
Plainscan's AI Keyword Extractor goes further by weighting keywords based on semantic importance — the same logic that search engines use to understand content relevance. The result is a keyword list that genuinely reflects the core topics of your document, ready to use for SEO tagging, content strategy, research indexing, and more.
How Plainscan AI Keyword Extraction Works
Upload Document or Paste Text
Drag and drop your file into the upload area, click to browse your computer, or paste text directly into the tool. Plainscan accepts DOCX, DOC, PDF, and plain text files up to 50 MB.
AI Reads and Analyses Content
Plainscan's AI engine processes your document using NLP to understand the semantic structure. It identifies entities, concepts, and themes, distinguishing between filler words and meaningful terms.
Review Ranked List and Export
Your extracted keywords are displayed in a ranked list, ordered by relevance. Review the results, remove any terms you don't need, and export your keyword list as CSV for use in your workflow.
What Can You Do with Extracted Keywords?
Discover how AI keyword extraction accelerates your content and research workflows.
SEO Content Optimization
Identify primary and secondary keywords in your content. Confirm your landing page is targeting the right terms or find gaps to fill.
Competitor Content Analysis
Upload a competitor's article and extract its keywords. Understand their target terms and build more comprehensive content.
Document Tagging & Indexing
Automatically tag large volumes of reports or contracts without reading each one manually. Build a searchable library faster.
Free vs. Pro: What Do You Get?
Upgrade for unlimited processing, batch uploads, and advanced export options.
| Feature | Free (Sign Up) | Pro (Paid) |
|---|---|---|
| AI Keyword Extraction | Yes (basic) | Yes (full AI depth) |
| Supported File Types | DOCX, DOC | DOCX, DOC, PDF, TXT |
| Daily Extractions | 100 / day | Unlimited |
| Max File Size | Up to 50 MB | Unlimited |
| 100 / month | Unlimited | |
| Export Formats | CSV only | CSV, TXT, JSON |
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Frequently Asked Questions
Q: What is an AI keyword extractor?
A: An AI keyword extractor is a tool that uses natural language processing (NLP) and large language models (LLMs) to automatically identify and rank the most important words and phrases in a document or text. Unlike simple word-frequency counters, AI keyword extractors understand semantic meaning.
Q: How does AI keyword extraction work?
A: AI keyword extraction works by processing the input text through a natural language processing model that understands context and meaning. The model identifies entities, key phrases, and recurring themes, ranking them by semantic relevance.
Q: Is Plainscan's AI keyword extractor free?
A: Yes. Plainscan offers a free tier that allows you to sign up and extract keywords from documents at no cost. Free users get basic AI extraction and CSV export with up to 100 daily extractions.
Q: What file formats does Plainscan's keyword extractor support?
A: Plainscan's AI keyword extractor supports DOCX and DOC files for free users. Pro users gain access to additional formats including PDF and plain text (TXT) files.
Q: How do I extract keywords from a Word document online?
A: Sign up for a free account, navigate to the tool, upload your DOCX or DOC file, and the AI processes your document and displays a ranked keyword list in seconds. Export as CSV for your workflow.
Q: What is the difference between keyword extraction and keyword research?
A: Keyword research identifies which terms people search for online (volume/difficulty). Keyword extraction identifies which terms are already present and important within a specific document.
Q: Can I extract keywords from a PDF using AI?
A: Yes. Plainscan Pro users can upload PDF files directly and extract keywords using the AI keyword extractor. Free users can extract keywords from DOCX and DOC files.
Q: How accurate is AI keyword extraction?
A: AI keyword extraction accuracy depends on document quality and clarity. For well-written documents, AI extractors like Plainscan identify correct keywords with high reliability by understanding context and semantic relevance.
Q: Is my document secure when I upload it to Plainscan?
A: Yes. Plainscan encrypts all file uploads using AES-256. Documents are processed on private, secure servers and are never shared or used to train AI models. Files are deleted within 24 hours.
Q: Do I need to create an account to use the AI keyword extractor?
A: You need to sign up for a free Plainscan account to use the AI keyword extractor and save or export your results. Signing up is free and requires no credit card.