Drop a video to auto-caption it ✦
MP4, MOV, WebM — captions are written on your device, nothing is uploaded
Auto Caption Generator
Add automatic captions to any video, on your device
FAQ
How does the auto caption generator work?
It listens to your video's speech with an on-device AI model, writes out the words with timings, and shows them as captions over your video. You can tweak the text, pick a style, and export.
Is my video uploaded anywhere?
No. The transcription and captioning run entirely in your browser, so your video never leaves your device.
What can I export?
A standard .srt subtitle file that works in YouTube, Premiere, CapCut and most players, plus a captioned video with the subtitles burned in.
Why does the first caption take a moment?
The speech model downloads the first time you use the tool, then it is cached and much faster on later videos.