# sumatrapdfreader/sumatrapdf

SumatraPDF reader

Repository: https://github.com/sumatrapdfreader/sumatrapdf
Canonical: https://ross.abutalabs.com/products/sumatrapdf
Homepage: http://www.sumatrapdfreader.org
Language: C
License: GPL-3.0
License Family: copyleft
Topics: pdf, pdf-viewer, win32, c-plus-plus, c
Last push: 2026-08-26T23:40:30+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 78, longevity 100
- inputs: {"age_days": 5083, "days_push": 7, "days_rel": 149, "gap_med": 19, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 17401, forks 2024 (observed 2026-08-28T04:11:19.643211+00:00)

## What it is
SumatraPDF is a free, open-source, lightweight multi-format document reader for Windows supporting PDF, EPUB, MOBI, CBZ/CBR, DjVu, XPS, CHM, and many image formats. It also ships command-line tools for converting, merging, extracting, and encrypting PDFs, and is highly customizable via themes, keyboard shortcuts, and toolbar layouts.

## Use cases
- read pdfs on windows without bloated adobe reader
- open epub and mobi ebooks
- view comic book cbz cbr files
- portable pdf viewer from a usb drive
- merge or split pdf pages from the command line
- extract text and images from a pdf
- customize a dark theme for a document reader
- annotate and highlight pdf documents

## When to choose
- you need a fast, minimal PDF/eBook reader on Windows
- you want a portable app with no installation
- you need scripting/CLI tools for PDF manipulation
- you value customization like themes, shortcuts, and toolbars

## When to avoid
- you need Linux, macOS, or Android support - it is Windows-only
- you need advanced PDF editing or form-filling features of full PDF suites
- you need DRM-protected ebook support

## Facets
- artifact type: application
- maturity: active
- function: pdf-viewer, gui, cli, ocr
- domain: pdf, files, desktop-applications, developer-tools
- platform: windows, cli
- tags: pdf-reader, ebook-reader, comic-reader, djvu, epub, portable, lightweight, document-viewer, pdf-tools, desktop

## Member repositories
- sumatrapdfreader/sumatrapdf (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:19.643211+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:02:58.354339+00:00, confidence not recorded.
  - readme: https://github.com/sumatrapdfreader/sumatrapdf (fetched 2026-08-28T04:11:19.643211+00:00, sha a2d39e3fb927)
  - homepage: http://www.sumatrapdfreader.org (fetched 2026-08-29T08:01:12.103744+00:00, sha 5499a63e37be)
  - site_page: https://www.sumatrapdfreader.org/docs/SumatraPDF-documentation (fetched 2026-08-29T08:01:12.113246+00:00, sha 03ed3a8c1e34)
  - site_page: https://www.sumatrapdfreader.org/docs/Customizing-keyboard-shortcuts (fetched 2026-08-29T08:01:12.115215+00:00, sha 44136fa355b3)
  - site_page: https://www.sumatrapdfreader.org/docs/Customize-theme-colors (fetched 2026-08-29T08:01:12.117004+00:00, sha 5ba6ed11c26e)
  - site_page: https://www.sumatrapdfreader.org/docs/Customize-toolbar (fetched 2026-08-29T08:01:12.118811+00:00, sha 17bf77b16bb3)
  - site_page: https://www.sumatrapdfreader.org/docs/Supported-document-formats (fetched 2026-08-29T08:01:12.120606+00:00, sha b46dc823fcd3)
  - site_page: https://www.sumatrapdfreader.org/docs/Why-only-Windows (fetched 2026-08-29T08:01:12.122270+00:00, sha 4de998dac6fb)
  - site_page: https://www.sumatrapdfreader.org/docs/Version-history (fetched 2026-08-29T08:01:12.123910+00:00, sha 3472e223bf88)
- Data as of 2026-08-30T08:39:29.467469+00:00.