Guide · 5 min read
How to make a product demo video — free, no editing
A clean product demo doesn't need a video editor. With auto-zoom, your clicks become smooth cinematic close-ups automatically. Here's the whole workflow.
1. Open the recorder in Chrome
Go to demozoom.app — no install, no extension, no account. It runs entirely in your browser tab, so nothing you record is uploaded to a server.
2. Click Start Recording and pick what to share
Choose a Chrome Tab (and tick “Share tab audio” for sound), a window, or your whole screen. For a demo, sharing the specific tab gives the cleanest result and captures audio.
3. Record your flow naturally
Walk through the feature as you normally would — at a calm pace, pausing briefly on the parts you'll want to highlight. You'll place the zoom points afterwards in the editor.
4. Add zoom points
In the editor, click where you want the camera to push in. DemoZoom builds a smooth cubic-bezier zoom for each one — place as many as you like, then drag them on the timeline to fine-tune the timing.
5. Export MP4 (or a GIF)
Export to MP4 in one click. Add a styled background, a webcam bubble, or blur a password region first. For a README or a tweet, export the first 15 seconds as a looping GIF.
Why it stays private
Every frame is processed locally using the WebCodecs API. You can verify it yourself in Chrome DevTools → Network: zero upload traffic. That makes it safe for NDA demos and client work.