About SubtitlePop

SubtitlePop turns speech into captions you can trust: every word timed, every line editable, and files that work in YouTube, video editors and web players.

It is built by the independent developer behind BG Remover Online, a tool for removing backgrounds from videos.

How it works

Your browser extracts the audio track from your video and sends it, in short pieces, to a speech recognition model. The words come back with their timings, and the editor turns them into captions. The video file never leaves your device for transcription.

Credits

The sample videos on this site use footage from Mixkit and narration from the FLEURS dataset by Google, licensed under CC BY 4.0. Captions are rendered with libass via JASSUB.

Open-source software

SubtitlePop is built with open-source software, used unmodified: JASSUB (LGPL-2.1 or later, with MIT-licensed parts) and libass (ISC) draw the captions in the editor, FFmpeg (LGPL/GPL) writes them into exported videos, MP4Box.js (BSD-3-Clause) and webm-muxer (MIT) read and pack audio in the browser. The fonts Montserrat, Figtree and Noto Sans are used under the SIL Open Font License. Each project’s source code and full licence text are available at the links above.

Contact

Questions, bugs or ideas: support@subtitlepop.com.