Opening extractor

Extract First Seconds from Video

Save the opening seconds of a recording as a separate MP4. Useful for intros, hooks, and quick previews.

First seconds workspace

Choose how much of the beginning to keep.

Loading assembly engine...

Assembly settings

Seconds from start

Opening length 10.0s

Preserve audio when possible

Turn this off if an export fails because a source has missing or incompatible audio.

How it works

1 Choose a source video.
2 Enter how many seconds from the start you want.
3 Export the opening as a separate MP4.

FAQ

Is my video uploaded anywhere?

No. The assembly work runs in your browser with WebAssembly, so the selected files stay on your device.

Why can export take a while?

The browser needs to decode and re-encode the video locally. Keep this tab open until the export finishes.

Does the tool add a watermark?

No. The exported MP4 is watermark-free.

What happens if I ask for more seconds than the video has?

The tool keeps the full video when the requested opening is longer than the source.

Want professional polish?

These browser tools are built for quick local assembly. Aufzeichna's desktop app is built for polished screen recordings with smooth cursor motion, cinematic zoom, and export control.

Check out the desktop app