Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Viper Browser

Codacy Badge Language grade: C/C++ Build Status

A powerful yet lightweight web browser built with the Qt framework

Licensed under GPLv3


  • All development is done with a focus on privacy, minimalism, and customization ability
  • Bookmark management
  • Built-in ad blocker, compatible with AdBlock Plus and uBlock Origin filters
  • Cookie viewer, editor, and support for cookie filters (QtWebEngine 5.11+ only)
  • Compatible with Pepper Plugin API
  • Custom user agent support
  • Fast and lightweight
  • Fullscreen support
  • Granular control over browser settings and web permissions
  • Gives the user control over their data, no invasions of privacy like other browsers are known to do..
  • GreaseMonkey-style UserScript support
  • Multiple options for home page- any URL, blank page, or a card layout page with favorite and most visited websites
  • PDF.js embedded into the browser
  • Save and restore browsing sessions, local tab history, pinned tabs
  • Secure AutoFill manager (disabled by default)
  • Tab drag-and-drop support for HTML links, local files, other browser window tabs, etc
  • Tab hibernation / wake up support
  • Traditional browser UI design instead of WebUI and chromium-based interfaces


The browser can be built using the cmake build system, by either importing the root CMakeLists file into your IDE of choice or performing the following commands from a console:

$ git clone viper-browser
$ mkdir -p viper-browser/build && cd viper-browser/build
$ cmake ..
$ make

Tests can be ran by setting the ENABLE_TESTING in the cmake configuration.

The binary will be located in the build/src/app folder when following the commands listed above.


This project is possible thanks to the work of others, including those involved in the following projects:

  • Qt Framework
  • PDF.js
  • Arora QT Browser
  • Qt Tab Browser example (From Qt 5.5 Webkit example archive)
  • Code Editor example
  • Qupzilla - for parts of AdBlockPlus implementation
  • Otter Browser - for parts of AdBlockPlus implementation

All licenses and credits can be found in the file LICENSE