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Google Swiffy

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Google Swiffy was a web-based tool developed by Google that converted SWF files to HTML5 Its main goal was to display Flash contents on devices that do not support Flash, such as iPhone, iPad, and Android Tablets Swiffy was shut down July 1, 2016


  • 1 Approach
  • 2 Supports
  • 3 Supporting browsers
  • 4 Development
  • 5 Related software
  • 6 References
  • 7 External links


A closed source web service hosted by Google converts SWF to an intermediate representation serialized as JSON This representation is in turn converted into SVG in the web browser via JavaScript, which is also used for animations The Swiffy thesis 2012 explains its general approach in the following way::15

The choice of SVG for rendering leaves us with several options to animate the SVG content At first sight, both CSS animation and SMIL, adhere to our design goal of using a declarative representation when possible However, both technologies provide insufficient control over the animation when support for ActionScript scripting is required For example, although the concept of keyframes exists in CSS animation, it does not provide a mechanism to synchronise the JavaScript code to those keyframes or to modify the timeline from JavaScript, which is a basic feature required for SWF compatibility Another limiting factor is that animation in the SWF file itself is not defined in terms of high-level transitions, but defines the position of every object at specific keyframes Mapping these definitions back onto CSS or SMIL transitions is not always possible Finally, these standards are not widely available: The CSS animation specification is still in working draft state, while SMIL is not implemented in the Internet Explorer browser We have therefore chosen to use JavaScript to animate SVG on the client Although this imperative approach might be less efficient, the level of control it provides is required to match all SWF functionality


Google Swiffy supported a subset of SWF 10, ActionScript 20 and ActionScript 30

Supporting browsers

  • Google Chrome
  • Safari
  • Firefox 5+ partly supported
  • IE9 partly supported and IE10
  • WebKit-based browsers


Swiffy was started in the summer of 2011 by Google engineering intern Pieter Senster, who joined their mobile advertising team to search for solutions to display Flash content on devices that do not support Flash Progress on Swiffy was sufficient that Google hired him full-time and formed a team to work on the project The product manager of Google Swiffy is Marcel Gordon

Swiffy 601 was released on February 11, 2014

Swiffy was shut down July 1, 2016

Related software

  • Wallaby by Adobe converts FLA files to HTML5
  • Mozilla Shumway took a different approach by implementing a virtual machine for SWF in JavaScript


  1. ^ Google is killing its Swiffy tool for converting Flash files into HTML5 on July 1
  2. ^ Pieter Albertus Mathijs Senster, The design and implementation of Google Swiffy: a Flash to HTML5 converter
  3. ^ Google Code Blog - Swiffy: convert SWF files to HTML5
  4. ^ Google is killing its Swiffy tool for converting Flash files into HTML5 on July 1
  5. ^ http://techcrunchcom/2013/10/03/shumway-mozillas-html5-based-flash-player-replacement-lands-in-firefox-nightly/

External links

  • Google Swiffy Homepage
  • Google Swiffy Demos
  • Google Code Blog - Swiffy: convert SWF files to HTML5
  • Google Swiffy Alternative to Convert Flash to HTML5

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Google Swiffy Information about

Google Swiffy

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