How do I summarize a research paper or a long report PDF?

A reading list with fifteen papers on it, a sixty-page report due for a meeting, a policy document you were asked for an opinion on. The honest use of a summary is triage: it tells you which of those deserve an afternoon and which deserve five minutes.

This is how to get a useful one, and where the limits are.

What you get back

Summarize PDF works in two stages.

First, a reading made on your device. Your browser opens the PDF, reads its text and shows the essentials straight away: how long it is in pages and words, the sections it found, and the key figures and sentences.

Then, a written summary. The text your browser read is sent to an AI model, which writes back:

• a title line saying what the document is, and
• between six and fourteen short points, each written as a label and a value.

The model is told to use only what the document says, to quote every figure and date exactly as written, and to answer in the document's own language.

The summary sits beside the document on screen, so any point can be checked against the page it came from. Copy and Download give you the summary as plain text; the download is a .txt file named after the PDF.

The length limit that matters for long papers

This is the part most tools do not tell you.

Only about the first 60,000 characters of text are sent to the AI. For English prose that is very roughly nine to ten thousand words, and less for text dense with numbers or references.

A typical journal article fits. A thesis, a long report or a book does not, and the AI will summarise the beginning of it. The reading made on your device still covers the whole document; the AI-written points do not.

For a research paper this matters in a specific way. The results and the discussion come near the end, and the references section at the very end can be thousands of characters on its own.

Fitting the part you care about under the limit

Work on a copy, never on your only file.

1. Remove what you do not need summarised. Use Delete Pages to take out the references, the appendices and any long tables of raw data. For most papers that leaves the introduction, method, results and discussion comfortably inside the limit.
2. Or summarise it in parts. For a long report, Split PDF into its chapters and summarise the ones that matter.

Each AI summary counts towards a daily allowance, so choose the parts before you start, not after.

Three a day, for everyone

Everyone gets three AI-written summaries in any 24 hours. That is the same for visitors and for signed-in accounts, because every summary uses an outside AI service.

When they are used up, you are not left with nothing: the reading made on your device stays on screen. It is built from the document's own words, so it is less fluent than the written summary, but everything in it is from the document.

Step by step

1. Open Summarize PDF and choose the file. The PDF itself is never uploaded.
2. The reading made on your device appears first. While the written summary is being prepared, the panel says "Reading it properly…".
3. Read the points against the document beside them.
4. Use Copy or Download to keep them.

What it will not do

• Read a scan. A scanned paper is a picture of words with no text for the browser to read. The tool tells you so. Run it through OCR PDF first, then summarise the result.
• Read the figures. Only the text is read. What a chart or an equation shows is not summarised, only whatever the surrounding text says about it.
• Answer questions. It writes one summary of the document. It is not a chat, and you cannot ask it follow-up questions.
• Point to pages. The points do not carry page references. That is why the document stays beside them.

Using summaries honestly

A summary is for deciding what to read, not a replacement for reading it. Three rules keep that straight:

• Never cite a summary. If a point matters to your work, find it in the paper and cite the paper.
• Check every number. The model is told to quote figures exactly, and it usually does. But "usually" is not good enough for a result you will quote.
• Do not hand in a summary as your own work. Many universities treat submitting AI-written text as your own as misconduct. Use it to organise your reading, then write in your own words.