How to Summarise a Long PDF With AI (Properly)

A good AI summary is not "this document discusses financial performance". It is "revenue grew 12% to £4.2m, driven by the enterprise tier; the main risk flagged is supplier concentration". The difference comes from what you ask for.

Before you summarise

The model can only summarise text it can read. If your PDF is a scan, run OCR first — otherwise you are handing over a stack of pictures. Check by trying to select a sentence in the document.

Step-by-step: summarising in Docsy

1. Open the Summarise PDF tool.
2. Upload the document.
3. Choose the depth you want — a short executive brief or a section-by-section breakdown.
4. Run the summary and wait for the text to stream in.
5. Copy the result, or download it to keep alongside the original.

Ask for structure, not prose

Summaries improve dramatically when you specify the shape of the answer:

• "List the five key findings as bullets, each with the figure that supports it."
• "Summarise in 150 words for a non-technical reader."
• "Extract every deadline and the party responsible."
• "What are the three biggest risks and where are they described?"

Verify before you rely on it

Treat a summary as a fast first read, not evidence. Spot-check every number and date against the source. For contracts and anything with legal or financial consequences, read the clauses the summary points you to — the value is in being directed to the right paragraph quickly.

Usage limits

Free accounts include 25 AI requests per day, which is enough for regular use. Premium removes the daily ceiling for heavy research work. Requests only count when they succeed, so a failed run does not cost you an attempt.

FAQ

How long a document can be summarised?

Long reports are handled by processing the document in sections and combining the results, so book-length files still work.

Is the summary accurate?

It is a strong first pass, but it can miss nuance or paraphrase imprecisely. Always verify figures, dates and obligations against the original text.

Can I summarise a scanned document?

Run OCR first so the pages contain real text, then summarise the searchable version.

Is my document used to train AI models?

No. Documents are processed to answer your request and are not used for model training.

Summarise something long

Take the report you have been avoiding and get the gist in under a minute.