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Synapsi

Free AI PDF summarizer

Drop a PDF and get a summary in short titled sections. Papers, chapters, slides, reports. No signup, no card.

Free · no signup · no card

Free to use. Free to keep.

The tool needs no account. A free account saves every result, adds the full study kit, and syncs to your phone.

This free PDF summarizer turns a paper, a chapter, or a slide deck into a short summary with titled sections. Upload the file and read the shape of it in seconds, then decide which parts deserve your full attention. It runs on our servers, no sign up and no card needed.

01

Upload your PDF

Upload a PDF. No account needed.

02

Run the tool

The AI reads your source on our server and writes the result. A long file takes a little longer.

03

Study or save

Use it right away, or save it to a free library and get the full study kit from the same source.

Why use this pdf summarizer

Titled sections, not a blob

You get short sections with headings, so you can scan the structure and jump to the part you need.

Papers, chapters, slides

One summarizer for a research paper, a course reading, or a deck of 60 slides you did not attend.

Tied to your file

The summary covers what the PDF says. No generic filler about the subject bolted on top.

Then go deeper

Turn the same PDF into flashcards, a quiz, or a mind map when reading it once is not enough.

Who it's for

Students

Find out what a 40 page reading is about before you decide how much of your evening it gets.

Researchers

Pull the question, the method, and the result out of a paper to judge whether it belongs in your review.

Anyone with a long report

Read the summary first, then open the two sections that actually matter to you.

Questions

What kind of PDFs work?

Papers, book chapters, lecture slides, reports. Scanned PDFs work too, up to 20 pages: AI reads the page images first. A free account raises the scan limit to 200 pages.

How long can the PDF be?

Up to about 12,000 characters per run, which covers most papers and chapters. Sign up free to process a long document whole.

Is the summary made up?

No. It summarizes what is in your file. If the PDF does not say something, the summary will not either.

Is it free?

Yes, no account needed. Sign up free to save the summary and turn the same PDF into flashcards and a quiz.

Study it on your phone too

Synapsi runs on the web, iPhone, iPad, Mac and Android. One free account, the same notes everywhere.

Related study tools

Got a PDF instead? Pull the text out first, then run any study tool on it.

PDF to text