How to Summarise a Long PDF

Long documents arrive faster than anyone can read them. A summary is not a substitute for reading the parts that matter — it is a way of finding out which parts those are.

Summarise a PDF

1. 1Open the AI Summarizer and add your document.
2. 2Let it extract the text and produce a summary.
3. 3Read the summary to locate the sections that matter to you.
4. 4Read those sections properly in the original.

Summarise a section, not the whole thing

A summary of 200 pages is necessarily shallow — it has to compress everything equally, so nothing gets attention. Extract the chapter or section you care about and summarise that instead. Ten pages summarised into a paragraph is genuinely useful; two hundred pages summarised into a paragraph is a table of contents with extra words.

What summaries reliably miss

• Qualifications and exceptions, which are exactly where the risk lives.
• Numbers in tables, which rarely survive summarisation intact.
• The significance of something absent — a summary cannot report what is not there.
• Tone and emphasis in a document where those carry meaning.
• Cross-references between distant sections.

For a contract, a regulatory filing or anything with legal consequence, treat a summary strictly as a navigation aid. The obligation is in the text.

Using the document with an AI tool yourself

Converting to Markdown first produces a much better result than pasting raw extracted text: headings and lists survive, so the model can be asked about a named section rather than about an undifferentiated wall of prose.

Privacy

Summarisation that runs on a server sends the document to it. For a published report that is irrelevant; for a client file or an unreleased set of accounts, it is a disclosure. Check where the processing happens before you summarise anything confidential — and note that this is a separate question from where the file was converted.

A workflow for a long report

1. 1Read the contents page and the executive summary — often the whole answer.
2. 2Summarise to find where your topic is discussed.
3. 3Extract those pages into their own file.
4. 4Read them properly.
5. 5Search the full document for key terms to catch anything the summary skipped.