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Tech riderRev. 7 Oct 2026

Mozilla PDF.js

Ch 215.9of 26 PDF Readers
  1. 1Runs onAPI, Browser, Linux, self-hosted, Web
  2. 2CostsFree plan
  3. 3Annotation toolsYes
  4. 4Form fillingYes
  5. 5Platform supportweb
5 lines stated Written from the maker's own pages: mozilla.github.io
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The Mozilla PDF.js homepage

Overview

Mozilla PDF.js is ranked #21 of 26 in PDF readers on Specifiction. It runs on API, Browser extension, Linux, Self-hosted, Web. There is a free plan.

Mozilla PDF.js plans and pricing

All plans
PDF.js Free Open-source PDF parsing and rendering platform · Apache 2.0 license mozilla.github.io · 7 Oct 2026

Compared on PDF readers

Free plan
Yesmozilla.github.io
Annotation tools
Yesmozilla.github.io
OCR support
nonemozilla.github.io
Form filling
Yesmozilla.github.io
Platform support
webmozilla.github.io

Facts

Purpose
PDF.js is a web standards-based platform for parsing and rendering PDF files.mozilla.github.io · 7 Oct 2026
Viewer
Its viewer layer provides the user interface used in Firefox and project browser extensions, and can be adapted to build a custom viewer.mozilla.github.io · 7 Oct 2026
API
The display layer exposes an API for rendering PDFs and retrieving document information.mozilla.github.io · 7 Oct 2026
Annotations
PDF.js renders annotations for viewing and supports adding a subset of annotation types.github.com · 7 Oct 2026
Browser support
The project aims to support HTML5-compliant browsers and provides a legacy build for older browsers; PDF feature support varies by browser and version.github.com · 7 Oct 2026
Integrations
PDF.js is built into Firefox 19 and later, and the project provides a Chromium browser extension.github.com · 7 Oct 2026
Distribution
Prebuilt builds are available, and the project lists jsDelivr, cdnjs, and unpkg as CDNs hosting PDF.js.mozilla.github.io · 7 Oct 2026
Self hosting
The project documents cloning and building PDF.js locally, and says a local web server is needed because some browsers disallow opening PDFs through file URLs.mozilla.github.io · 7 Oct 2026
Security reporting
The project directs reports about the library or Firefox PDF Viewer to Bugzilla and reports about the Chrome extension to GitHub’s private vulnerability reporting form.github.com · 7 Oct 2026
Cross-origin constraint
PDF.js cannot make cross-origin requests by default; the FAQ describes CORS or a server proxy as possible approaches.github.com · 7 Oct 2026
Large documents
The FAQ recommends rendering only visible pages to reduce memory use when working with many high-resolution pages.github.com · 7 Oct 2026
Support
The project points users to GitHub issues for technical problems and its Matrix room for questions or guidance.github.com · 7 Oct 2026
Intended users
The project describes itself as community-driven and invites contributors, while its library and viewer documentation gives developers ways to embed or build on PDF.js.github.com · 7 Oct 2026
License
PDF.js is licensed under Apache 2.0, and its documentation is licensed under CC BY-SA 2.5.mozilla.github.io · 7 Oct 2026

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Where it ranks on Specifiction

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