DualBook 8 languages

Free online tool — no sign-up

Summarize a book with AI

The model reads the entire book — every chapter, not an excerpt — and writes a summary in the language you pick. Reading a book is cheap for a model; it is writing that costs time.

The whole book's text is sent to our server to be read and summarised, then discarded. The file itself stays on your device.

Most free summarisers read the first few thousand words and write about those, which is why their summaries are confident about the opening and vague about everything after it. This one sends the whole book.

That is affordable for a reason worth knowing: a model reads far faster than it writes. Measured on this tool, the complete text of Pride and Prejudice — 122,566 words — went in and a 523-word summary came back in nine seconds, because almost all of the time goes into producing the answer rather than consuming the question.

The summary is flowing prose, not bullet points, and it is written in whichever language you choose — so you can read an English book and get its summary in Vietnamese.

How it works

  1. Choose your EPUB

    A DRM-free EPUB. Your browser extracts the text; the file itself is never uploaded.

  2. The whole book is read

    Every chapter, in order — not the opening chapters and a guess about the rest.

  3. A summary comes back in your language

    Five or six hundred words of flowing prose, in whichever of the twenty-four languages you picked. Read it on the page, copy it, or download it as a text file.

What a summary cannot do

A summary is not the book. It carries the plot and the themes; it cannot carry the prose, which for most books worth reading is the point.

It contains the ending. A summary written from the whole book spoils the whole book. That is the trade for it being accurate about more than the first chapter.

The whole text is sent to a server. The converters on our tools page run entirely in your browser and upload nothing. This one cannot — the model is not on your machine — and unlike the translation tools, which send only the first fifteen pages, this one has to send everything. The text is discarded when the job ends.

Very long books are capped. Past roughly 700,000 characters the tail is not read, which affects a handful of the longest novels ever written and nothing else.

Questions

Does it really read the whole book?

Yes — every chapter is sent, not a sample. You can tell: ask for a summary of a book whose ending you know and check whether the ending is there.

How long is the summary?

Five to six hundred words of flowing prose — measured at 523 words in English and 627 in Vietnamese for the same book. Long enough to carry the plot and the themes, short enough to read in a couple of minutes. In Japanese and Chinese the length is counted in characters instead, because those languages do not put spaces between words.

Can I get the summary in a different language from the book?

Yes. Pick any of the twenty-four target languages; it is independent of the book's own language.

Why is this free when it reads the whole book?

Because reading is the cheap half. A model consumes a whole novel in seconds and spends its time writing the answer — and the answer here is short. Measured: 122,566 words in, nine seconds, 523 words out.

Does it spoil the ending?

Yes, and it has to. A summary written from the complete book describes the complete book, including how it ends. If you want the opening without spoilers, use the translation tool instead — it stops at fifteen pages.

Summaries, and an audiobook of them

The app writes summaries at the length you choose and can narrate them, so you can listen to a book you have not read yet.

Open DualBook