📝 Text Summarizer

Automatically summarize long articles using an AI-like algorithm. Extracts important sentences using the TextRank method with keyword analysis and compression rate display. Use it to organize the key points of reports and articles.

0/ 10,000 characters

Usage and Application Examples

  • Paste the text you want to summarize into the text area and click the 'Summarize' button
  • You can choose the summary length from 'Short (3 sentences)', 'Standard (5 sentences)', or 'Long (8 sentences)'
  • Important sentences are highlighted in the original text so you can verify the context
  • Quickly understand the main topics with keyword analysis
  • Copy the summary to the clipboard and use it in reports or emails

What is Text Summarizer?

The Text Summarizer tool automatically condenses long articles, research papers, and documents into concise summaries using the TextRank algorithm. Unlike generic AI models, TextRank analyzes sentence importance by examining word relationships and document structure, extracting the most meaningful sentences without rephrasing. This makes it ideal for quickly grasping key points from lengthy content while preserving the original language and intent.

How to Use

Simply paste or upload your text into the input field and select your desired summary length using the ratio slider (typically 30-50% of original length). Click the summarize button and the tool extracts the most important sentences in their original order. The summary appears instantly without waiting for external API processing. You can copy the result, download it as a text file, or adjust the compression ratio and regenerate for different detail levels.

Use Cases

Students benefit significantly when reviewing research papers for assignments—extract core findings in seconds rather than rereading entire documents. Busy professionals use it to digest industry reports and competitor analysis during morning briefings. Content creators summarize lengthy interviews or source material before writing blog posts. Journalists quickly identify newsworthy angles from press releases and reports. Teachers assign students to compare original and summarized versions to develop critical reading skills.

Tips & Insights

TextRank works by calculating sentence scores based on word frequency and connections between sentences. Higher scores indicate sentences that appear central to the document's topic. This mathematical approach differs from neural AI models—it never invents new information, making summaries reliable for technical documents where accuracy matters. For best results, ensure your source text has clear structure with complete sentences. Scientific papers and news articles summarize more effectively than fragmented social media content.

Frequently Asked Questions

What algorithm do you use for summarization?

We use extractive summarization inspired by TextRank. We calculate word frequency scores for each sentence and select important sentences by factoring in bonuses for sentence position, presence of numbers, citations, and more.

What is the maximum number of characters I can input?

You can input up to 10,000 characters. This provides sufficient capacity for summarizing long reports or entire articles.

Will the text I type be sent to the server?

No. All processing is completed in your browser, and input data is never sent to external servers. You can use it with confidence.

Can I also summarize English text?

We use an algorithm optimized for Japanese, but we can also summarize English text by dividing sentences at periods for basic summarization.

Can I adjust the length of the summary?

Yes. You can choose from 3 levels: 'Short (3 sentences)', 'Standard (5 sentences)', or 'Long (8 sentences)'. The optimal number of summary sentences is automatically adjusted based on the text length.

How long does it take to summarize a document?

Summarization is performed locally in your browser, so processing time is typically 1-3 seconds depending on text length and your device's processing power. Longer documents or older devices may take slightly longer, but the entire process happens instantly without waiting for server responses.

What types of content summarize best?

News articles, research papers, blog posts, and educational content typically produce the best summaries since they contain clear topic sentences. Content with narrative storytelling, poetry, or highly creative writing may produce less useful summaries since the algorithm focuses on extracting key factual information.

Can I summarize content in multiple languages?

Yes, the TextRank algorithm works with any language, though it was optimized for Japanese and English. The accuracy may vary slightly depending on the language's grammatical structure, but most major languages should work reasonably well.

What should I do if the summary is missing important details?

Try adjusting the summary length slider to a higher percentage—this will preserve more sentences from the original text. You can also try re-summarizing by refreshing the page, as the algorithm may extract different sentences depending on text formatting and structure.

Is there a minimum text length for effective summarization?

While technically any length works, summarization is most effective with at least 500 characters (roughly 100-150 words) of content. Very short texts may result in little-to-no reduction in length since there's less redundant content to eliminate.

Can I use the summaries for commercial or republished content?

Yes, summaries generated by this tool are yours to use freely, including for commercial purposes. However, you should still respect the copyright of the original source text when sharing or republishing summaries.