How it works
- Pick your video — it stays on your device.
- Choose 9:16 for Reels, TikTok and Shorts, 1:1 or 4:5 for feed posts.
- Blurred background keeps the whole picture; Crop to fill fills the screen — slide Focus to keep the speaker in frame.
- Add a headline, trim the start and end, and download. Then send it straight to Auto Subtitles.
Frequently asked questions
Does it keep the sound?
Yes, the MP4 keeps the original audio (in Chrome, Edge and other browsers with WebCodecs audio support).
Is there a length limit?
No hard limit, but rendering takes roughly as long as the clip on a laptop, so trim to the part you need.
Is my video uploaded?
No. Everything — decoding, drawing and encoding — happens in your browser.