How to summarize a long PDF with AI
A one-page summary of a long PDF, organized by section, with page references you can check.
Before you start
- A PDF with selectable text (not a scanned image)
- A Claude or ChatGPT account that allows file uploads
Check the document’s length
Open the PDF and note the page count. Under about 50 pages of normal text usually fits in one go with current tools. Longer than that, plan to split it into parts so nothing falls outside the context window.
Upload the PDF
Start a new chat so earlier conversations don’t take up space, then attach the file. If you split it, upload one part at a time.
Ask for a structured summary
Paste the summary prompt and fill in its variables: who the summary is for and how long it should be. Asking for page numbers makes the next step much faster.
Spot-check against the original
Pick three points from the summary and find them in the PDF using the page numbers. If any point doesn’t match, ask the model to correct it, and treat the rest with more care.
If it doesn't work
- The summary skips whole sections.
- The file is probably larger than the context window. Split the PDF and summarize each part separately.
- The tool says it can't read the file.
- The PDF may be a scanned image. Run it through a text-recognition (OCR) tool first, or export it again with selectable text.
- The summary includes something that isn't in the document.
- Ask the model to quote the exact sentence it relied on. If it can't, remove that point.