Speak Subtitles for YouTube
Reads YouTube subtitles out loud with synthetic voices in many languages, so you can listen to a video instead of reading captions.
Chrome extension
Lets you highlight and copy text that appears inside videos on YouTube and other sites, such as code from tutorials or lecture slides.
Selectext lets you highlight and copy text that appears inside a video frame on YouTube and other sites, including when the player is in full screen. It is handy for students, programmers and anyone who would otherwise retype text shown on screen.
Pause a video and click the Selectext toggle that appears in the top left of the player, or use the keyboard shortcut, then drag over the text you want.
Results depend on video resolution and how clearly the text is shown, so blurry or stylised text may not be recognised accurately.