Recordings are saved as WebM files, which are supported by most modern video players and can be converted to MP4 using free tools.
No. Everything happens in your browser. Your screen recording is never sent to any server.
When you choose to share a browser tab, system audio from that tab can be captured. Sharing an entire screen may not include system audio depending on your browser and OS.
Enabling the microphone lets you add voice narration on top of your screen recording, useful for tutorials and walkthroughs.