Gemini Prompt for Summarizing a Document
Summarizing a long document is one of the tasks where Gemini excels thanks to its massive context window that can handle up to 1 million tokens. Whether you have a 200-page annual report, a complex legal contract, or a university thesis, Gemini can extract the essentials in seconds. However, a simple "summarize this document" often produces a generic result that misses critical information for your use case. The key lies in a structured prompt that specifies the desired level of detail, the analysis angle, and the output format. A good summary prompt guides Gemini to distinguish essential information from noise, retain important numerical data, and adapt the tone to the target audience. In this guide, you will find an optimized main prompt as well as three variants adapted to your expertise level. Whether you are a student looking to synthesize your courses, a professional needing to digest industry reports, or a researcher analyzing scientific literature, these prompts will save you hours of reading while preserving the substance of the original document.
The prompt
You are an expert in document synthesis. Summarize the following document following these precise instructions:
-
Summary structure:
- An introductory paragraph (2-3 sentences) presenting the central subject and main thesis of the document
- 3 to 5 thematic sections covering the major ideas, each with a clear title
- A synthetic conclusion with practical implications or key recommendations
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Summary rules:
- Retain all important numbers, dates, and quantitative data
- Identify and highlight main arguments vs. secondary examples
- Flag any nuance, reservation, or limitation mentioned by the author
- Target length: approximately 10-15% of the original length
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Output format:
- Use bold titles for each section
- Add a bullet-point list of 5 key takeaways at the end
- End with a single sentence summarizing the document in one line
Document to summarize:
[PASTE_YOUR_DOCUMENT_HERE]
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Why it works
This prompt leverages three fundamental principles of prompt engineering: role assignment (expert in synthesis) which activates an analytical processing mode, explicit output structuring which prevents Gemini from producing a shapeless block of text, and quantitative constraints (10-15%, 5 key points) which force information prioritization. The requirement to retain numbers and nuances counters the natural tendency of LLMs to over-generalize during summaries.
Expected result
Variants by level
FAQ
What is the maximum document length that Gemini can summarize?
How can I get a faithful summary without Gemini inventing information?
Can I summarize a document in a different language from its original?
How to use this prompt
- Copy the prompt with the button above.
- Paste it into ChatGPT, Claude or your favorite AI assistant.
- Replace the bracketed variables with your details, then refine the result.
About Prompt Guide
Prompt Guide is a free library of 4800+ ready-to-use prompts for ChatGPT, Claude and other AIs, with guides to learn prompting and tools to build and optimize your own prompts.
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