SumatraPDF review
A portable Windows reader with broad format support, annotations, signatures, and command-line tools.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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, printing, customizable keyboard shortcuts, and themes support everyday reading, while portable deployment allows the application to run as a self-contained executable. It is a focused choice for Windows users who value local access and a lightweight document workflow.
Its feature depth is strongest in reading, annotation, signatures, and accessibility. The annotation set includes highlights, underlines, strikeouts, squiggly underlines, free text, stamps, carets, images, and ink. Digital signatures can use Windows certificates or PFX/P12 files. Read Aloud works with Windows text-to-speech, and the published feature set also includes AI chat with documents as a pre-release feature. These capabilities make SumatraPDF useful for reviewing and signing documents, although it cannot fill PDF forms and does not provide OCR for scanned pages.
SumatraPDF also fits workflows that benefit from portable and command-line operation. Its command-line tools support PDF conversion, extraction, merging, page operations, and search, extending the reader beyond an interactive desktop interface. The trade-off is platform scope: the official availability is Windows-only, with no macOS, Linux, web, or mobile versions. Choose SumatraPDF for free local reading, broad format coverage, annotations, signatures, and automation on Windows. Choose another reader if form filling, OCR, or access across non-Windows platforms is central to the workflow.
SumatraPDF pros and cons
- 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
SumatraPDF fact sheet, pricing and score →
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