Prompt ChatGPT for Summarizing a Document
Summarizing a document is one of the most requested tasks for ChatGPT, and for good reason: when faced with 50-page reports, dense scientific articles, or endless meeting minutes, saving time without losing the essentials has become a key skill. But a simple "summarize this text" often produces a flat result that misses important nuances. The difference between a mediocre summary and a truly useful one depends entirely on the quality of the prompt used. A good summary prompt must specify the expected format, desired level of detail, target audience, and priority elements. It should also guide ChatGPT on what not to do: invent information absent from the document, merge distinct ideas, or omit crucial numerical data. The prompts on this page are designed to extract the substance of a document while preserving its logical structure, key arguments, and conclusions. Whether you are a student working on a thesis, a professional reviewing an audit, or a researcher analyzing a literature review, you will find here the prompt tailored to your exact need.
Paste in your AI
Paste this prompt in ChatGPT, Claude or Gemini and customize the variables in brackets.
You are a document summarization expert. I will provide you with a complete document. Your goal is to produce a structured summary that is faithful to the original text.
Instructions:
- Start with a hook sentence that captures the central thesis or main objective of the document.
- Organize the summary into thematic sections with clear subtitles, respecting the logical structure of the original document.
- For each section, identify: the main idea, the key arguments or data supporting it, and partial conclusions.
- Preserve all important numbers, dates, proper names, and factual data.
- End with a "Key takeaways" section in bullet points (5 to 8 points maximum).
- Target length: approximately 20% of the original document length.
- Never rephrase an idea in a way that could alter its meaning. If there is ambiguity in the text, indicate it in square brackets [ambiguity in original text].
- Do not add any information, opinion, or interpretation absent from the source document.
Here is the document to summarize:
[PASTE_DOCUMENT_HERE]
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Why this prompt works
This prompt leverages three key mechanisms: role assignment (summarization expert) which activates a precise analytical register, numbered structural constraints that eliminate ambiguity about the expected format, and the explicit fidelity rule that drastically reduces hallucinations. The 20% target forces the model to prioritize information rather than simply truncate the text.
Use Cases
Variants
Expected Output
You will get a structured summary with subtitles that respects the logic of the original document while reducing its length by approximately 80%. Numerical data and important facts are preserved, and a list of key takeaways allows for quick reading by busy people.
Frequently Asked Questions
What is the maximum document length that ChatGPT can summarize?
ChatGPT (GPT-4o) can handle approximately 128,000 input tokens, which equates to roughly 90,000 to 100,000 words. For longer documents, break them into logical sections and summarize each section separately, then ask for a summary of those summaries. With the file upload feature, you can directly load PDFs, Word documents, or text files without copying and pasting.
How can I ensure that ChatGPT does not distort the meaning of the original document?
Three techniques reduce this risk: first, include an explicit fidelity instruction in your prompt ("never rephrase an idea in a way that changes its meaning"). Next, ask ChatGPT to flag ambiguous passages rather than interpreting them. Finally, after receiving the summary, ask a verification question like "Are there any points from the original document that you have omitted or oversimplified in this summary?" to identify potential gaps.
Can you summarize a document in a language different from the original text?
Yes, ChatGPT handles simultaneous translation-summarization very well. Simply add to your prompt: "The document is in [source language]. Produce the summary in [target language]." Quality is better with the languages most represented in its training data (English, French, Spanish, German, Chinese). For less common languages, it is preferable to first summarize in the original language, then translate the summary.
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Run this prompt through the Optimizer to strengthen its context, constraints and expected format.
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- LéaAI
Astuce : pour les documents très longs (>30 pages), découpez le prompt en plusieurs passages (une section à la fois) puis demandez une fusion finale. Cela évite les oublis et respecte mieux la fidélité.
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