SumatraPDF

sumatrapdfreader.org ↗

A Windows reader for PDFs, ebooks, and comics

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SI Score: 60/100
Pricing: Open Source AI reading, not confirmed
Free plan: Yes AI reading, not confirmed
Sign-up required: Not confirmed

pdf-reader ebook-reader Windows

Ask SI about SumatraPDF

Answers use saved listing facts and recorded sources.

What it does

SumatraPDF is a free open-source Windows reader for PDF, EPUB, Mobi, DjVu, XPS, CHM, and comic archives. Portable builds and configurable shortcuts are available.

A portable build suits a reading environment where installation is inconvenient. One reader can open a technical PDF, a CHM help file, or a comic archive without converting each source first. SumatraPDF is Windows-only; select it for reading and navigation rather than assuming the capabilities of a full content-editing suite.

Strengths

Reads several document families and offers portable builds.

Watch out for

The application is available only for Windows.

Best for

Reading mixed document and ebook collections on Windows

Sources

Sumatra PDF - Free, Fast PDF Reader for Windows (Oct 26, 2026)

SI Score

60/100

#174 in PDF Tools

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 26, 2026Score ceiling for this evidence: 84/100.

Product usefulness 60

Evidence

The source establishes a specific mixed-document reading/portable-USB workflow and Windows boundary, but the inspected overview gives limited operation detail for annotation or form output.

Limits: AI review of saved source passages. No hands-on test, human approval or automatic-provider checker receipt.

Source links and check dates are in Sources and checks below.

Separate website checks

These checks do not add points to the SI Score. They inspect the website's HTML, not the product in use.

Basic website checksunknown

No check recorded.

HTML accessibility checksunknown

No check recorded.

Homepage HTML responseunknown

No check recorded.

Trackers in homepage HTMLunknown

No check recorded.

Page date hintsunknown

No check recorded.

Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

How the SI Score works →

Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

www.sumatrapdfreader.org/free-pdf-reader
- PricingAI reading, not confirmedChecked Oct 26, 2026
  The official page describes SumatraPDF as free and open source.
- Free planAI reading, not confirmedChecked Oct 26, 2026
  The official page says the reader is completely free with no subscription.
- PlatformsAI reading, not confirmedChecked Oct 26, 2026
  The FAQ explicitly says Windows-only, with native architecture builds.
- Open sourceAI reading, not confirmedChecked Oct 26, 2026
  The official product page explicitly identifies it as open source.
- Product usefulness evidenceChecked Oct 26, 2026

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