As the Occupy Flash initiative looks to end the reign of Adobe’s Flash Player plug-in in web browsers, Google has conveniently made an announcement over at the Code blog about the Swiffy Extension for Flash Professional. This handy add-on lets developers convert their vector animations in Flash Professional to HTML5.

With the Swiffy Extension, you can publish to HTML5 right from Adobe Flash Professional. This makes using Flash to develop HTML5 animations much easier. The extension accesses Google Swiffy as a web service, so you always use the most recent version of Swiffy.

The extension is compatible with Adobe Flash Professional CS4 or newer for Windows XP/Vista/7 or Mac OS X 10.4+ (download it here). It cannot convert every conceivable Flash project to HTML5 so you may want to check out the output panel that lists any Flash features used in your project that are not supported by Swiffy.

The extensions is based on Swiffy, an experimental web app released back in June as a way of liberating web developers from the confines of Adobe’s Flash platform. It was subsequently updated with new features and got a new home at g.co/swiffy.

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