Auto Caption Generator
Generate captions for any video with AI, automatically. Produces SRT/VTT subtitle files and can burn captions into the video, all locally in your browser.
Drag & drop files here, or browse
Processed on your device. Nothing is uploaded
How to use Auto Caption Generator
- 01Add files
Choose files or drop them here
- 02Settings
Settings · Runs on your device
- 03Download
Processed on your device. Nothing is uploaded
Frequently asked questions
How do auto captions work?
The audio is extracted from your video with an in-browser FFmpeg, then transcribed by the Whisper AI model with word-level timing, producing ready-to-use caption files. Nothing leaves your device.
What do I download?
An SRT subtitle file (accepted by YouTube, VLC, Premiere and every major player). Enable burn-in to also get a copy of the video with captions rendered on top.
Is there a length limit?
No fixed limit. Longer videos simply take longer, since your own device does the AI work. Shorts and clips of a few minutes finish fastest.