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PDF.js — parse and render PDFs in the browser with web-platform technologies

OSS scale score 334.9OSS health 93Update pace 277 commits/30d
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OSS scale score is an unbounded metric that log-compresses and weights Stars, Watchers, Forks, and Contributors. Discovery score is the current OSS scale score minus the score at discovery. Update pace is commits in the last 30 days, growth momentum is the OSS scale score difference within the recent observation window, and OSS health is a 0–100 rating based on available recency, Community Health, and release data.

Stars
53,903
Primary language
JavaScript
License
Apache-2.0
Repository last updated
Sep 20, 2026

Overview

PDF.js is a Mozilla-supported PDF viewer platform implemented in JavaScript and web standards. Applications can use the complete viewer or integrate lower-level display APIs such as `getDocument` into a custom experience.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Load documents and render individual pages

getDocument opens a PDF and exposes page-level information and rendering operations for custom viewers.

Sources: [2][3]

Choose the complete viewer or lower-level display APIs

Projects can adopt the viewer UI or use pdfjs-dist APIs to build only the rendering and navigation features they need.

Sources: [2]

For embedded PDF viewing, search, and navigation in web applications

It fits applications that need PDF presentation and interaction integrated into their browser UI.

Sources: [2]

Plan worker delivery, browser support, and bundle size

Production integration needs correct worker configuration, modern/legacy build choices, and memory considerations for large PDFs. It is not a PDF editing library.

Sources: [2][4]

Official sources

  1. [1]mozilla/pdf.js repository(2026-09-21)
  2. [2]PDF.js README(2026-09-21)
  3. [3]PDF.js getDocument example(2026-09-21)
  4. [4]PDF.js development package metadata(2026-09-21)
  5. [5]PDF.js Apache-2.0 license(2026-09-21)
Supplemental curator note

The latest GitHub release is 6.3.289. The repository is the development source tree; application consumers normally use the prebuilt `pdfjs-dist` package. PDF.js focuses on parsing and viewing PDFs, which is distinct from creation/editing libraries such as pdf-lib.

Try it in 3 steps

  1. 1

    Install the distribution package

    Application consumers normally use the prebuilt pdfjs-dist package rather than the repository source tree.

    npm install pdfjs-dist
  2. 2

    Import the Node document loader

    Use the same API path demonstrated by the official Node example.

    import { getDocument } from 'pdfjs-dist/legacy/build/pdf.mjs'
  3. 3

    Inspect the page count

    Verify parsing first; browser viewer integration additionally needs worker configuration.

    const pdf = await getDocument('sample.pdf').promise; console.log(pdf.numPages)
Check the official README

Growth

Growth trends · Last 30 days

53,903 Stars

Trend data is still being collected.

Development activity

Last 90 days · weekly

Commits (last 30 days)
277
Open PRs
60

Development activity is still being collected.

Built with

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GitHub data

GitHub dataView detailed GitHub data
View on GitHub
Stars
53,903
Forks
10,686
Watchers
1,096
Open issues
370
Contributors
387
Primary language
JavaScript
License
Apache-2.0
Repository last updated
Sep 20, 2026
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