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Internet Video Streaming Service, YouTube, offers captioning services in videos. The author of the video can upload a SubViewer (*.SUB), SubRip (*.SRT) or *.SBV file.

YouTube is currently testing an Automatic Caption Feature, which will transcribe audio and not require the author to add a captioning file. This feature was only available on certain videos, but now is available to all English videos. However, the automatic captioning is often inaccurate on videos with background music and exaggerated emotion in speaking. On June 30, 2010, YouTube announced a new "YouTube Ready" designation for professional caption vendors in the United States. The initial list included 12 companies who passed a caption quality evaluation administered by the Described and Captioned Media Project, have a website and a YouTube channel where customers can learn more about their services, and have agreed to post rates for the range of services that they offer for YouTube content.

Flash video also supports captions via the Distribution Exchange profile(DFXP)of W3C Timed Text format.  The latest Flash authoring software adds free player skins and caption components that enable viewers to turn captions on/off during playback from a webpage.  Previous versions of Flash relied on the Captionate 3rd party component and skin to caption Flash video.  Custom Flash players designed in Flex can be tailored to support the Timed Text exchange profile, Captionate .XML, or SAMI file (see Hulu captioning).

The Silverlight Media Framework. also includes support for the Timed Text exchange profile for both downlad and adaptive streaming media.

Windows Media Video can support closed captions for both video on demand streaming or live streaming scenarios.  Typically Windows Media captions support the SAMI file format but can also carry embedded closed caption data.

QuickTime video supports true 608 caption data via QuickTime's proprietary Closed Caption Track.  These captions can be turned on and off and appear in the same style as TV closed captions with all the standard formatting (pop-on, roll-up, paint-on) and can be positioned and split anywhere on the video screen.  QuickTime Closed Caption tracks can be viewed in Mac or Windows versions of QuickTime player, iTunes, QuickTime web browser plug-in and iPod Nano, iPod Classic, iPod Touch, and iPhone.