# futurepress/epub.js

Enhanced eBooks in the browser.

Repository: https://github.com/futurepress/epub.js
Canonical: https://ross.abutalabs.com/products/epubjs
Homepage: http://futurepress.org
Language: JavaScript
License: NOASSERTION
License Family: other
Topics: epub
Last push: 2026-03-24T04:19:58+00:00

## Health v2 (maintenance only)
Score: 56/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 73, release rhythm 8, longevity 100
- inputs: {"age_days": 5058, "days_push": 162, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6950, forks 1188 (observed 2026-08-28T04:09:51.707947+00:00)

## What it is
Epub.js is a JavaScript library for rendering ePub documents in the browser across many devices. It provides interfaces for common ebook functions such as rendering, persistence, and pagination without requiring a dedicated application or plugin.

## Use cases
- render epub books in a web browser
- build an online ebook reader
- display paginated epub content in a web app
- embed epub reading into a website
- create a continuous scrolling epub reader
- read epub files on mobile and desktop browsers

## When to choose
- you need to render EPUB files client-side in the browser
- you want paginated or continuous scrolling ebook display without building a native app
- you need a permissively licensed (FreeBSD) epub rendering library

## When to avoid
- you need to convert EPUB to other formats like PDF or Mobi
- you need server-side epub processing rather than browser rendering
- you need a full-featured native ebook application

## Facets
- artifact type: library
- maturity: stable
- function: parser, ui-components, file-upload
- domain: web-development, frontend, files, pdf
- platform: browser
- tags: epub, ebook-reader, rendering, pagination, jszip, javascript, nodejs

## Member repositories
- futurepress/epub.js (main) score 56

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:51.707947+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:41:12.479056+00:00, confidence not recorded.
  - readme: https://github.com/futurepress/epub.js (fetched 2026-08-28T04:09:51.707947+00:00, sha 943f6183583a)
  - registry_npm: https://registry.npmjs.org/epub.js (fetched 2026-08-29T08:37:16.442337+00:00, sha d829d2beaaf2)
- Data as of 2026-08-30T08:39:29.467469+00:00.