OpenSpeaks Subtitler

What OpenSpeaks Subtitler is

OpenSpeaks Subtitler is a free web tool for creating and editing subtitles for audio and video, particularly for oral history and language documentation. Silence detection can split speech into draft subtitle segments, with controls for the silence threshold, minimum silence length, and end buffer. The editing workspace includes a waveform timeline, editable subtitle cards, live text over video, and segment looping; changes save to local project state in real time. Completed subtitles can be exported as UTF-8 encoded SRT or VTT files. The tool can load media and existing subtitles from Wikimedia Commons and upload finished subtitles there as TimedText. A side-by-side panel provides machine-translation assistance. Wikimedia login uses OAuth 2.0, and the tool says it stores no separate password. Silence detection runs client-side using FFmpeg.wasm in a web worker. The software is listed under the MIT license, with a Free plan at no cost and no paid plan or usage limits stated. Its maker identifies archivists, language documenters, and Wikimedians, especially those working with low-resourced languages, as intended users.