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Head-to-head · PDF Readers

SumatraPDF vs MuPDF

  • Updated Sep 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score SumatraPDF #6 in PDF Readers 7.1/10 Free plan Free plan✓ 4 of 4 features Visit SumatraPDF
MuPDF #11 in PDF Readers 6.5/10 Free plan · paid from $299/mo · 14-day trial Free plan✓ 1 of 4 features Visit MuPDF

SumatraPDF leads on 3 checks, MuPDF on 0, and 2 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSumatraPDF · 7.1/10
  • Free planboth
  • Most featuresSumatraPDF · 4 of 4

SumatraPDF scores higher on our rubric for pdf readers: 7.1 against 6.5 out of 10; our editors rank them #6 and #11.

SumatraPDF offers form filling; MuPDF doesn't publish it. SumatraPDF offers offline access; MuPDF doesn't publish it. SumatraPDF offers text-to-speech; MuPDF doesn't publish it. On platform support, MuPDF gives you Cross-platform where SumatraPDF offers Desktop.

SumatraPDF is the better fit for portable Windows reading with signatures. MuPDF is the better fit for developers needing a powerful open-source viewer.

  • SumatraPDF fits best

    Portable Windows reading with signatures

  • MuPDF fits best

    Developers needing a powerful open-source viewer

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. It never changes our verdict. How we rank.

Side by side

Feature SumatraPDF 7.1/10 Visit ↗ MuPDF 6.5/10 Visit ↗
At a glance
Editor score 7.1 6.5
Ranking #6 in PDF Readers #11 in PDF Readers
Best for Portable Windows reading with signatures Developers needing a powerful open-source viewer
Pricing model Free Free plan + paid
Starting price Not published Not published
Free plan ✓ ✓
Free trial — —
Deployment Desktop Cloud, Self-hosted, Browser extension
Platforms Windows Web, Linux, Windows, macOS
Support Docs, Community Email
Built for Solo, Small business, Mid-market Small business, Mid-market, Enterprise
Features SumatraPDF 4/4 · MuPDF 1/4
Annotation tools ✓ ✓
Form filling ✓ (best) Not published
Offline access ✓ (best) Not published
Text-to-speech ✓ (best) Not published
Specs
OCR support Not published Not published
Platform support Desktop Cross-platform
Our review
Pros
  • Opens PDFs, ebooks, comics, images, and several document formats
  • Supports annotations, digital signatures, and Windows text-to-speech
  • Portable deployment and command-line PDF operations support local workflows
  • Supports rendering, extraction, annotations, redaction, forms, and signatures
  • Runs across web, desktop, mobile, API, and embedded environments
  • Includes mutool command-line tools and bindings for five languages
Cons
  • Windows-only, with no macOS, Linux, web, or mobile versions
  • Cannot fill PDF forms, despite supporting form-field highlighting
  • Scanned pages require OCR elsewhere
  • No OCR support
  • AGPL terms may not fit proprietary embedding or redistribution
  • Primarily a developer library, not a standalone consumer reader
Our verdict

SumatraPDF is a free, open-source desktop reader for Windows. It is aimed at people who want to read PDFs and a broad set of other local formats, including EPUB, MOBI, CBZ, DjVu, XPS, CHM, and image files. Text search, document navigation,…

Read the review →

MuPDF is an open-source C library and document engine for developers building PDF and document workflows across desktop, mobile, web, server, and embedded environments. It covers viewing, rendering, extraction, conversion, annotation,…

Read the review →
  1. SumatraPDFPDF Readers 7.1Free plan
  2. MuPDFPDF Readers 6.5Free plan · paid from $299/mo · 14-day trial

Strengths and trade-offs

  • SumatraPDF — where it wins

    • Opens PDFs, ebooks, comics, images, and several document formats
    • Supports annotations, digital signatures, and Windows text-to-speech
    • Portable deployment and command-line PDF operations support local workflows

    Where it doesn't

    • Windows-only, with no macOS, Linux, web, or mobile versions
    • Cannot fill PDF forms, despite supporting form-field highlighting
    • Scanned pages require OCR elsewhere
  • MuPDF — where it wins

    • Supports rendering, extraction, annotations, redaction, forms, and signatures
    • Runs across web, desktop, mobile, API, and embedded environments
    • Includes mutool command-line tools and bindings for five languages

    Where it doesn't

    • No OCR support
    • AGPL terms may not fit proprietary embedding or redistribution
    • Primarily a developer library, not a standalone consumer reader
  • SumatraPDF7.1/10 · Free plan

    A portable Windows reader with broad format support, annotations, signatures, and command-line tools.

    Visit SumatraPDFFull verdict →
  • MuPDF6.5/10 · Free plan · paid from $299/mo · 14-day trial

    A developer-focused PDF engine with broad document tooling and cross-platform support.

    Visit MuPDFFull verdict →

More comparisons

Guides on PDF readers

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update