Question 1

Which browsers support screen recording?

Accepted Answer

Screen recording via getDisplayMedia() is supported in Chrome (version 72+), Edge (version 79+), Firefox (version 66+), and Opera. Safari does not support getDisplayMedia for screen sharing and therefore cannot use this tool. On mobile devices, screen recording via browser is not supported — mobile browsers do not implement getDisplayMedia. For iOS and Android screen recording, use the built-in OS screen recorder.

Question 2

What video format is the recording saved in?

Accepted Answer

Recordings are saved in WebM format, which is an open, royalty-free video container using VP8 or VP9 video codec and Opus audio codec. WebM files are natively playable in Chrome, Firefox, Edge, and most modern media players including VLC. If you need to convert to MP4 for wider compatibility (for example, for Apple devices or certain upload platforms), use HandBrake (free) or FFmpeg (command line) to convert.

Question 3

Can I record audio from my screen?

Accepted Answer

Yes, if you choose to share a browser tab or application window, you may be offered the option to include audio from that source. When sharing your entire screen, system audio capture depends on your operating system: Windows allows system audio capture via getDisplayMedia, while macOS does not expose system audio to getDisplayMedia due to OS restrictions. In all cases, microphone audio can be mixed in using an additional getUserMedia audio stream, which is not implemented in this basic tool.

Question 4

Is my recording uploaded to a server?

Accepted Answer

No. All recording happens entirely in your browser using the MediaRecorder API. The recorded data is stored in memory as Blob objects. When you download a recording, it is served directly from your browser's memory as a temporary object URL. Nothing is uploaded to any server. However, because recordings are stored in browser memory, they are lost when you close or refresh the page. Always download recordings you want to keep before navigating away.

Question 5

How long can I record?

Accepted Answer

Recording duration is limited by your available RAM. Each minute of 1080p screen recording at 30 FPS typically consumes 100–300MB of memory depending on screen content complexity. A system with 8GB RAM could theoretically record for 15–30 minutes before running out of memory, though the browser will likely crash before exhausting all system RAM. For long recordings, use a native screen recorder like OBS Studio, which writes directly to disk without memory limitations.

Question 6

Why does the recording look lower quality than my screen?

Accepted Answer

The MediaRecorder API uses lossy video compression (VP8 or VP9) to reduce file size. The default bitrate may be lower than ideal for high-motion content or fine text. Some browsers allow specifying a target bitrate via the videoBitsPerSecond option. Additionally, fast cursor movements and rapid screen changes will compress more aggressively than static content. For highest quality, increase your system's display resolution and use a dedicated screen recorder with configurable bitrate settings.

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