Study & YouTube tool
Text Summarizer
The Text Summarizer condenses long passages into a short list of the most important sentences, so you can grasp the core of an article, report, or chapter in seconds.
The summary is produced by an extractive algorithm that runs entirely in your browser — your text never leaves your device, and no account or API key is needed.
Privacy & data handling
Browser processingThis is a local extractive summarizer — it selects sentences in your browser and does not call an AI service. Nothing is uploaded or sent to a server.
Interactive tool
Text Summarizer
Extracted summary will appear here automatically when source text is provided...
Overview
What does Text Summarizer do?
You paste or type your text, choose how many sentences you want back, and the tool returns the sentences that best represent the whole passage. It does not invent new wording; it picks the existing sentences that carry the most meaning.
A slider or field controls the summary length, so you can request a one-sentence gist or a longer digest depending on how much detail you need.
Under the hood
How does it work?
The tool scores each sentence by how often its words appear across the passage. Words that repeat frequently are treated as the passage's core vocabulary, so sentences built from those words are ranked as more central. The top-scoring sentences are then returned in their original order.
This is extractive summarization: every sentence in the result is quoted verbatim from your input. There is no language model involved, which keeps it fast, private, and free.
Key features
Features of Text Summarizer
Use cases
When should you use Text Summarizer?
Skimming research and reports
Grab the key findings from a long PDF or article before deciding whether to read it in full.
Preparing study notes
Reduce a textbook chapter to its core sentences, then turn those into flashcards or quiz questions.
Reviewing your own writing
Summarize a draft to check that the main point actually comes through before you publish.
Step-by-step
How to use Text Summarizer
- Step 1
Paste your text into the editor.
- Step 2
Adjust the target number of summary sentences.
- Step 3
Review and copy the extracted summary.
Real example
Example
Before (input)
Photosynthesis is the process by which green plants use sunlight to synthesize food from carbon dioxide and water. It generally involves the green pigment chlorophyll and generates oxygen as a by-product. Photosynthesis is vital for life on Earth because it provides most of the oxygen in the atmosphere.
After (summary)
Photosynthesis is the process by which green plants use sunlight to synthesize food from carbon dioxide and water. Photosynthesis is vital for life on Earth because it provides most of the oxygen in the atmosphere.
Repeated words like photosynthesis and oxygen push the sentences that contain them to the top.
Technical information
How the details work
The extractive algorithm tokenizes the passage, filters out common stop words, and builds a frequency table. Each sentence receives a score based on the total frequency of its remaining words divided by its length, so short, dense sentences rank well. Results are returned in document order rather than score order, which keeps the summary readable.
Privacy & security
Your data stays yours
Your text is processed locally in your browser and is not uploaded by the tool.
Local processing — files stay in your browser
- Summarization runs on your device with no network requests.
- Nothing you paste is stored after the tab is closed.
- No account, API key, or usage tracking is required.
Limitations
What this tool does not do
- The result quotes your own sentences — it cannot produce new phrasing or analysis.
- Very short passages with little repetition produce weaker summaries.
- The tool works best on factual prose; creative or highly technical writing may summarize unevenly.
- It is an extractive summarizer, not a generative-AI or LLM service.
Frequently asked questions
Common questions about Text Summarizer
Is this a real AI or a language model?
It is a local extractive algorithm — it ranks and quotes your own sentences. No generative model, no API calls, and no cloud processing.
How do I control the summary length?
Use the number control to choose how many sentences to keep. Start with 3 and increase if you need more detail.
Will the summary change my wording?
No. Every sentence in the result is copied verbatim from your input, preserving facts and tone.
Is my text private?
Your text is processed locally in your browser and is not uploaded by the tool.
Why did it skip an important sentence?
Ranking favors sentences with frequently repeated words. A one-off but crucial sentence can lose to denser, more repetitive ones — increase the sentence count to catch it.
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