FBReader vs Mozilla PDF.js

FBReader9.1Visit Mozilla PDF.js8.4Visit

Higher score FBReader #3 in File Reader Software 9.1/10 Free plan Free plan✓ 0 of 4 features Visit FBReader

vs

Mozilla PDF.js #6 in File Reader Software 8.4/10 Free plan Free plan✓ 1 of 4 features Visit Mozilla PDF.js

• FBReader fits best

  Readers who want broad-format ebook support

• Mozilla PDF.js fits best

  Embedding a PDF reader in a web application

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Side by side

Feature	FBReader 9.1/10 Visit ↗	Mozilla PDF.js 8.4/10 Visit ↗
At a glance
Editor score	9.1	8.4
Ranking	#3 in File Reader Software	#6 in File Reader Software
Best for	Readers who want broad-format ebook support	Embedding a PDF reader in a web application
Pricing model	Free plan + paid	Free
Starting price	—	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop, Mobile	Self-hosted
Platforms	Windows, macOS, Linux, iOS, Android	Web
Support	Community, Docs	Community, Docs
Built for	Solo, Small business	Solo, Small business, Mid-market, Enterprise
Features FBReader 0/4 · Mozilla PDF.js 1/4
Annotations	Not checked yet	✓ (best)
Text search	Not checked yet	Not checked yet
Accessibility support	Not checked yet	Not checked yet
Cloud sync	Not checked yet	Not checked yet
Specs
Supported formats	Not checked yet	Not checked yet
Platforms	Not checked yet	Not checked yet
Our review
Pros	Reads EPUB, FB2, MOBI, HTML, RTF, and plain text Offers bookmarks, synced reading position, and customizable layouts Runs on Windows, macOS, Linux, iOS, and Android	Renders PDFs in the browser with search, zoom and page navigation Supports annotations, interactive forms, printing and downloading Open source and self-hostable, with a customizable reference viewer
Cons	PDF and comics support is included with Android Premium The free iOS edition limits the library to ten books Some mobile features, including network translators, require a paid edition	Focused on PDFs rather than multiple document types No OCR support Requires developers to embed or customize the viewer and host its assets
Our verdict	FBReader is an ebook reader for people who want to read across desktop and mobile devices without being tied to a single book format. It supports EPUB and FB2, along with MOBI, HTML, RTF, and plain text, and it can open Readium… Read the review →	Mozilla PDF.js is an open-source JavaScript technology for parsing and rendering PDF files in web applications. Its reference viewer gives developers a starting point for adding document navigation, search, annotations and interactive… Read the review →

Strengths and trade-offs

• FBReader — where it wins

  • Reads EPUB, FB2, MOBI, HTML, RTF, and plain text
  • Offers bookmarks, synced reading position, and customizable layouts
  • Runs on Windows, macOS, Linux, iOS, and Android

  Where it doesn't

  • PDF and comics support is included with Android Premium
  • The free iOS edition limits the library to ten books
  • Some mobile features, including network translators, require a paid edition

• Mozilla PDF.js — where it wins

  • Renders PDFs in the browser with search, zoom and page navigation
  • Supports annotations, interactive forms, printing and downloading
  • Open source and self-hostable, with a customizable reference viewer

  Where it doesn't

  • Focused on PDFs rather than multiple document types
  • No OCR support
  • Requires developers to embed or customize the viewer and host its assets

• FBReader9.1/10 · Free plan

  A format-flexible ebook reader with free desktop editions and optional paid mobile features.

  Visit FBReaderFull verdict →
• Mozilla PDF.js8.4/10 · Free plan

  A self-hosted PDF viewer for web apps, with navigation, annotations and forms.

  Visit Mozilla PDF.jsFull verdict →