Video-To-JPG/.github ? reverse-engineered prompt

Build me a simple browser based app that lets someone upload a video and extract high quality JPG images from it without sending the file anywhere, so it all stays private on the device.

I want a clean page where I can drop in a video, preview it, choose how many images to pull out or grab frames from specific moments, then download the results easily. Please make it feel fast and polished, and show clear progress while it works. If you need to look up current docs online for the best way to handle video frame extraction in the browser, go ahead.

Also add a small demo area or example so it is obvious how the tool works right away, and make sure the experience is straightforward enough for someone who is not technical.