HelpViewer is unclaimed —

HelpViewer

Your help - Clear - Fast - No compilation·helpviewer.github.io

Free plan · Open source

HelpViewer is a modern, portable, and fast tool for viewing Markdown and HTML documentation directly from ZIP archives or from a local directory. It runs entirely in JavaScript inside the browser, requiring no server or backend, and no data is sent to any server. Users can unzip a deployment package and open index.html directly, or optionally run it via a local static HTTP server or deploy it to a web server as a Progressive Web App. It is MIT licensed and supports features like bookmarks, notes, full-text search, and exporting chapters to multiple formats.

What it's for

Viewing Markdown and HTML documentation from ZIP archives or unpacked directoriesBrowsing hierarchical help/documentation topic treesExporting chapters to HTML, Markdown, LaTeX, ePub, or RTFPresenting documentation in a slide-based presentation modeAdding personal notes to documentation chaptersSearching documentation via full-text or glossary keyword searchSwitching between language versions or versions of a help file

Features 21

Bookmarks for chapters
Configurable main functions in a tree view
Export current chapter or all chapters to HTML, Markdown, LaTeX, ePub, RTF
Export text to a static website without JavaScript
Five native color schemes and 8 selectable styles
Full-screen expansion of topic content
Full-text search dictionary for chapter contents
Lightweight, under 1.38 MiB
Multiplatform via web browsers
No installation required, just unzip and run locally
Offline mode without backend or local server
Personal notes on chapter paragraphs
Plugin system and extensible architecture
Presentation mode with chapter/slide navigation via arrow keys
Print-friendly version
Progressive Web Application installable on device
Protection against XSS attacks via DOMPurify
Responsive design for desktop and other devices
Runs entirely in JavaScript in the browser with no data sent to a server
WCAG 2.1 accessibility rules implemented
Works out of the box with a single Markdown file

At a glance

free tieropen sourceself-hostable

TypeWeb app

DeploymentSelf-hosted

PlatformsWeb, Windows, Linux

LanguagesEnglish, Czech

Integrations

MarkedJSZipPrismMermaidDOMPurify

Resources

Docs