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4.2 KiB

noVNC: HTML5 VNC Client


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

Notable commits, announcements and news are posted to @noVNC

There are many companies/projects that have integrated noVNC into their products including: Ganeti Web Manager, Archipel, openQRM, OpenNode, OpenStack, Broadway (HTML5 GDK/GTK+ backend), OpenNebula, CloudSigma, Zentyal (formerly eBox), SlapOS, Intel MeshCentral, Amahi, Brightbox, Foreman and LibVNCServer. See this wiki page for more info and links.


  • 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 LGPLv3


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), 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 (

    • New 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)