ABOUT
Useful subtitle tools.
Less friction.
MP4toSRT brings everyday subtitle tasks into one free browser workbench. Generate SRT from speech, inspect embedded MP4 subtitles, edit timing and text, and convert between SRT and WebVTT.
Built for local processing
Whisper runs on your device through Transformers.js. MediaBunny decodes compatible media audio locally. A dedicated MP4 text-track reader inspects supported embedded captions. No paid speech API or server-side transcription is used.
A focused first version
The tools prioritize text, timing and reliable downloads. Device capability affects transcription speed, and some media formats are unsupported. There is no login or subscription.