The move goes significantly beyond the current access to YouTube videos in which any Web user can copy and embed selected videos onto their own Web pages.
YouTube said its latest customization offerings allow anyone building a Web site or Internet-connected software program to upload videos straight to YouTube. They can fetch video feeds, comments, responses or playlists from YouTube.
Web site developers can let users rate videos or add them to a favorites list embedded within their own sites. They can also customize and control the Flash video playing software through which videos are viewed.
The new Application Programmer Interfaces (APIs), lets developers build a so-called "chromeless" Flash player -- a video-viewing window that is stripped of formatting such as title bar, browser buttons or status bars so they can create their own players.
These free customization features can be used in conjunction with the existing APIs which launched last year and which provide the ability to view videos on other sites and to search for videos on YouTube.
By adding underlying features and functions of YouTube, developers can enable users to publish videos directly from their mobile phone devices or encourage new users to share videos to the Web site, as if they were on YouTube itself.
To find out what you will build with the new APIs in this release from Google engineers.