A stream subtitle overlay is a visual layer on a live broadcast that displays real-time captions of what the streamer is saying. It sits on top of the game or camera feed and updates continuously. Modern overlays are delivered via OBS browser source and support multiple languages.
The streamer's microphone audio is captured by a cloud service, transcribed via AI, optionally translated, and delivered to a browser page that renders the text as a subtitle. This page is added to OBS as a browser source.
Modern subtitle overlays support custom fonts, colors, backgrounds, positioning, and animation. Pro tools also support dual-language display — e.g., English and Spanish captions simultaneously.
Subtitles increase viewer retention by 43% on average, make streams accessible to deaf/hard-of-hearing viewers, and enable silent viewing on mobile. StreamTranslate adds subtitles via OBS browser source in 60 seconds.
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