Free tool · runs entirely in your browser
Skim a document before you install anything
Drop a PDF, EPUB, DOCX, HTML, or text file (or paste text) and watch the real Fast Reader engine build its outline, pull out key terms, and cost a skim plan — in this tab, with nothing uploaded.
What just ran
The outline comes from a sentence/heading splitter that scores each sentence for how much of its section it carries. The key terms are raw tf-idf over the document’s own sections, not a canned keyword list — a term that is dense in two sections and absent from the rest outranks one sprinkled evenly through all of them. The costed read plan picks sentences by your chosen depth, holds each on screen long enough to actually read it, and reports the honest numbers: coverage (the share of the text you will actually see) and gist rate (the whole-document words-per-minute the skim time buys you) — never just a speed claim.
Frequently asked questions
Is this the real Fast Reader engine, or a fake demo?
It is the real engine. This page bundles the same src/skim outline/key-term/costed-read-plan code and the same src/import PDF/EPUB/DOCX/HTML parsers that ship inside the Fast Reader app, compiled to run in your browser tab with esbuild. There is no server behind it pretending to analyze your file.
Does my document get uploaded anywhere?
No. Everything — parsing, tokenizing, outlining, term extraction, and plan costing — runs in this tab with JavaScript. There is no network request anywhere in the demo script; closing the tab discards everything.
What files can I drop in?
PDF, EPUB, DOCX, HTML, Markdown, and plain text, or you can just paste text directly. Scanned, image-only PDFs need OCR, which this browser demo does not run — the app itself has an on-device camera scan for that case.
Why would I still install the app if this runs in the browser?
This demo only shows the skim/survey side. The app adds the RSVP and guided-pacer reading modes, a calibration trainer with comprehension checks, a notebook that captures quotes as you read, your library and progress saved on-device, and offline listen mode — none of which a stateless browser tab can give you.