Where the file goes
Straight into memory and then to your Downloads folder — nothing is streamed anywhere. Browsers record WebM (VP8/VP9); if you need MP4, convert afterwards. Long recordings use RAM, so save every few minutes for very long sessions.
What the browser will and will not let you capture
You choose the source — a whole screen, a single window, or one browser tab — and the browser shows a permission dialogue that cannot be bypassed. That is deliberate: a page able to record your screen without asking would be a serious problem.
Tab audio can be captured on Chrome and Edge. System-wide audio is more limited, and on macOS generally needs additional software. Microphone audio works everywhere.
Nothing is uploaded, which cuts both ways
The recording is assembled in the page and saved to your downloads. Nothing reaches a server, which is the right arrangement for anything showing internal software or customer data — and it also means the recording exists nowhere else, so closing the tab before saving loses it.
Long recordings are held in memory as they grow. For a session of any length, record in segments rather than one continuous take.
Frequently asked questions
Can it record system audio?
Chrome and Edge can capture tab audio when you share a tab and tick the audio box in their dialog. Full-system audio capture is not exposed to web pages on most platforms.
Is my video uploaded anywhere?
No. Decoding, processing and re-encoding all happen inside your browser using WebCodecs and MediaRecorder — a 2 GB file never travels over the network.
Can it record system audio?
Tab audio works on Chrome and Edge. System-wide audio is restricted by the operating system and on macOS generally needs extra software. Microphone audio works everywhere.
Is my recording uploaded?
No — it is built in the page and saved to your downloads. That also means it exists nowhere else, so save it before closing the tab.
How long can I record?
The limit is memory, since the recording is held as it grows. For anything long, record in segments.
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