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Head-to-head · PDF Readers

Mozilla PDF.js vs Adobe Acrobat Reader

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Mozilla PDF.js #5 in PDF Readers 8.8/10 Free plan Free plan✓ 2 of 4 features Visit Mozilla PDF.js
Adobe Acrobat Reader #8 in PDF Readers 8.5/10 Free plan Free plan✓ 3 of 4 features Visit Adobe

Mozilla PDF.js leads on 0 checks, Adobe Acrobat Reader on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMozilla PDF.js · 8.8/10
  • Free planboth
  • Most featuresAdobe Acrobat Reader · 3 of 4

Mozilla PDF.js scores higher on our rubric for pdf readers: 8.8 against 8.5 out of 10; our editors rank them #5 and #8.

On platform support, Adobe Acrobat Reader gives you Cross-platform where Mozilla PDF.js offers Web.

Mozilla PDF.js is the better fit for web and application developers. Adobe Acrobat Reader is the better fit for mainstream PDF reading and accessibility.

  • Mozilla PDF.js fits best

    Web and application developers

  • Adobe Acrobat Reader fits best

    Mainstream PDF reading and accessibility

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Mozilla PDF.js 8.8/10 Visit ↗ Adobe Acrobat Reader 8.5/10 Visit ↗
At a glance
Editor score 8.8 8.5
Ranking #5 in PDF Readers #8 in PDF Readers
Best for Web and application developers Mainstream PDF reading and accessibility
Pricing model Free Free plan + paid
Starting price Free plan —
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted Desktop, Mobile, Cloud
Platforms Web Windows, macOS, iOS, Android, Web
Features Mozilla PDF.js 2/4 · Adobe Acrobat Reader 3/4
Annotation tools ✓ ✓
Form filling ✓ ✓
Offline access Not checked yet Not checked yet
Text-to-speech Not checked yet ✓ (best)
Specs
OCR support None Not checked yet
Platform support Web Cross-platform
Our review
Pros
  • Open-source PDF parsing, rendering, search, and browser viewing
  • Annotation editing includes highlights, free text, ink, stamps, and signatures
  • Supports npm, CDNs, APIs, self-hosting, and Firefox and Chrome extensions
  • Free reading, printing, search, forms, signatures, and annotations
  • Available across Windows, macOS, iOS, Android, and the web
  • Includes text-to-speech and screen-reader and magnifier support
Cons
  • Requires developer integration rather than serving as a conventional end-user app
  • Its focus is PDF viewing, parsing, forms, and annotations
  • Interactive scripting is centered on PDF form calculations and actions
  • Advanced PDF editing is provided through paid Acrobat products
  • PDF conversion is outside the core Reader application
  • OCR is provided through paid Acrobat products rather than Reader
Our verdict

Mozilla PDF.js is an open-source JavaScript library and browser-based viewer for parsing and rendering Portable Document Format files. It is aimed at web and application developers who need to embed PDF capabilities in web applications or…

Read the review →

Adobe Acrobat Reader is a free PDF application for individuals, students, office workers, and organizations that need to view, print, search, share, annotate, sign, and complete PDF documents. Its free Reader plan supports desktop and…

Read the review →
  1. Mozilla PDF.jsPDF Readers 8.8Free plan
  2. Adobe Acrobat ReaderPDF Readers 8.5Free plan

Strengths and trade-offs

  • Mozilla PDF.js — where it wins

    • Open-source PDF parsing, rendering, search, and browser viewing
    • Annotation editing includes highlights, free text, ink, stamps, and signatures
    • Supports npm, CDNs, APIs, self-hosting, and Firefox and Chrome extensions

    Where it doesn't

    • Requires developer integration rather than serving as a conventional end-user app
    • Its focus is PDF viewing, parsing, forms, and annotations
    • Interactive scripting is centered on PDF form calculations and actions

  • Adobe Acrobat Reader — where it wins

    • Free reading, printing, search, forms, signatures, and annotations
    • Available across Windows, macOS, iOS, Android, and the web
    • Includes text-to-speech and screen-reader and magnifier support

    Where it doesn't

    • Advanced PDF editing is provided through paid Acrobat products
    • PDF conversion is outside the core Reader application
    • OCR is provided through paid Acrobat products rather than Reader

More comparisons

All PDF readers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update