How to summarize a PDF when the summary actually has to be useful
Summarizing a PDF sounds simple but breaks immediately under different needs. A board director wants a 5-bullet executive summary. A student wants study notes. A new joiner wants a TL;DR. A lawyer wants the obligations and dates extracted. Different jobs, different summaries — and the wrong shape of summary is worse than no summary at all.
What 'summarize' actually does
We extract the text from your PDF, segment it into logical sections (chapters, headings, page groups), summarize each section independently, then synthesize the section summaries into the format you asked for. This map-reduce structure is what lets us handle 1,000-page documents without hitting model context limits, and is also why long documents summarize cleanly without missing the back half.
The output format is a parameter, not a default. We support 11 distinct summary styles — pick the one that matches your job.
Picking the right summary style
Match the format to what you'll do with the summary:
- Executive summary (5–7 bullets). For decision-makers. Headline + key facts + recommendation.
- TL;DR (1 paragraph). Drop into Slack, email subject lines, or chat threads.
- Key points (10 bullets, full sentences). Briefing notes — the 'I read this so you don't have to' format.
- Study notes. Hierarchical bullets with definitions and examples called out — for learning, not for skimming.
- Action items. Each obligation extracted with its due date and responsible party. Best for contracts and meeting transcripts.
- FAQ. Question/answer pairs derived from the document. Useful for product docs or policies.
- Section-by-section. One bullet group per chapter. Keeps the document's structure visible.
Common mistakes
Patterns that produce summaries that look right but aren't useful:
- Summarizing without OCR on a scanned PDF. If there's no text layer, the model has nothing to read. The 'summary' you'll get is a hallucination. OCR first.
- Asking for 'a summary' without specifying the form. The default is fine for casual reading; for any specific use, pick the matching format.
- Using executive summary on a legal contract. Five bullets won't capture the cross-references and conditional obligations a contract requires. Use 'Action items' instead.
- Skipping the 'audience' option. A summary for a CFO reads differently than one for a junior analyst. Setting the audience changes the level of detail and the financial vocabulary.
- Trusting summaries on documents that contain factual claims. Models sometimes paraphrase numbers slightly. For high-stakes content (clinical, financial, legal), verify any specific number against the source.
Tips for the best summary
Habits that consistently produce better output:
- State the audience explicitly. 'For a CFO who'll spend 60 seconds on it' produces sharper output than the default.
- Pick the right length. Too short: omits critical context. Too long: defeats the purpose. 5 bullets for executives, 15 for briefings, 30 for study notes.
- Run sectional summaries on long docs. 1,000-page documents get one summary per chapter, then a meta-summary across them. The result is more usable than a single mega-summary.
- Combine with chat. Summarize first to understand the shape; then chat to drill into specifics.
- Export summary alongside the PDF. Saving the summary inside or beside the source preserves the context for next time you reach for the file.
Limits and pricing
Free preview: top-1-page summary. Full summary: 3 credits per document up to 100 pages, then 1 credit per additional 50 pages. Documents up to 1,000 pages. The model used is task-tuned for summarization specifically — not a general-purpose chatbot.