How to summarize long PDFs.

A 40-page report, a contract, a huge pile of study material. You need the content, but you do not have the whole afternoon. This is exactly what AI is good at.

01The problem with giant documents

The problem is not reading, it is reading everything only to find out that 3 pages mattered. Summarizing with AI flips the order: first you understand the whole thing in minutes, then you decide where it is worth going deeper.

02Step by step

• Open the document and copy the text, or upload the file if the tool accepts it
• Ask for an overall summary in a few points
• Read the summary and choose the part that interests you
• Ask for a detailed summary of just that part

This back and forth, from general to specific, is what makes the summary useful instead of shallow.

03The base prompt

Start with a clear request. This one works well for almost any document:

Summarize the document below in 7 points, highlighting decisions, deadlines and anything that requires action from me. Use simple language.

04Common mistakes when summarizing

Two stumbles always come up. The first is accepting the summary without checking numbers and dates in the original. The second is asking for a summary that is too short for a document that needed detail. Match the length of the summary to the size of the decision it will support.

A good summary is not the shortest one. It is the one that lets you decide without opening the whole document.