VNC client using HTML5 (Web Sockets, Canvas) with encryption (wss://) support.
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noVNC: HTML5 VNC Client


noVNC is a HTML5 VNC client that runs well in any modern browser including mobile browsers (iPhone/iPad and Android).

More than 16 companies/projects have integrated noVNC into their products including Ganeti Web Manager, OpenStack, and OpenNebula. See the Projects and Companies wiki page for more complete list.


Notable commits, announcements and news are posted to @noVNC

If you are a noVNC developer/integrator/user (or want to be) please join the noVNC discussion group

Bugs and feature requests can be submitted via github issues. If you are looking for a place to start contributing to noVNC, a good place to start would be the issues that I have marked as "patchwelcome".

If you want to show appreciation for noVNC you could buy something off my Amazon wishlist or you could donate to a great non-profits such as: Compassion International, SIL, Habitat for Humanity, Electronic Frontier Foundation, Against Malaria Foundation, Nothing But Nets, etc.


  • Supports all modern browsers including mobile (iOS, Android)
  • Supported VNC encodings: raw, copyrect, rre, hextile, tight, tightPNG
  • WebSocket SSL/TLS encryption (i.e. "wss://") support
  • 24-bit true color and 8 bit colour mapped
  • Supports desktop resize notification/pseudo-encoding
  • Local or remote cursor
  • Clipboard copy/paste
  • Clipping or scolling modes for large remote screens
  • Easy site integration and theming (3 example themes included)
  • Licensed under the MPL 2.0


Running in Chrome before and after connecting:


See more screenshots here.

Browser Requirements

  • HTML5 Canvas (with createImageData): Chrome, Firefox 3.6+, iOS Safari, Opera 11+, Internet Explorer 9+, etc.

  • HTML5 WebSockets: For browsers that do not have builtin WebSockets support, the project includes web-socket-js, a WebSockets emulator using Adobe Flash. iOS 4.2+ has built-in WebSocket support.

  • Fast Javascript Engine: this is not strictly a requirement, but without a fast Javascript engine, noVNC might be painfully slow.

  • I maintain a more detailed browser compatibility list here.

Server Requirements

Unless you are using a VNC server with support for WebSockets connections (such as x11vnc/libvncserver or PocketVNC), you need to use a WebSockets to TCP socket proxy. There is a python proxy included ('websockify').

Quick Start

  • Use the launch script to start a mini-webserver and the WebSockets proxy (websockify). The --vnc option is used to specify the location of a running VNC server:

    ./utils/ --vnc localhost:5901

  • Point your browser to the cut-and-paste URL that is output by the launch script. Enter a password if the VNC server has one configured. Hit the Connect button and enjoy!

Other Pages


  • noVNC : Joel Martin (

    • UI and Icons : Chris Gordon
    • Original Logo : Michael Sersen
    • tight encoding : Michael Tinglof (
  • Included libraries:

    • web-socket-js : Hiroshi Ichikawa (
    • as3crypto : Henri Torgemane (
    • base64 : Martijn Pieters (Digital Creations 2), Samuel Sieb (
    • jsunzip : Erik Moller (,
    • tinflate : Joergen Ibsen (
    • DES : Dave Zimmerman (Widget Workshop), Jef Poskanzer (ACME Labs)