Screen Recorder
Record your screen, window, or browser tab directly in the browser. No install, no upload. Your recording stays on your device.
How it works
This records your screen using the browser's own capture and recording APIs. Pick a screen, window or tab, record, download a WebM file. There is no extension to install and nothing is uploaded, because the browser hands the frames straight to a recorder running in the page.
Output is VP9 in a WebM container where the browser supports it, falling back to VP8. Audio, when you include it, is Opus.
More detail
Quality settings
The three presets set the video bitrate: 2.5 Mbps, 5 Mbps and 8 Mbps. That is a cap on how much data the encoder may spend per second, not a resolution setting - you always capture at whatever the source actually is.
2.5 Mbps is fine for a slide deck or a mostly static UI. 5 Mbps is the sensible default for a demo with scrolling and transitions. 8 Mbps is worth it for video playback or anything with constant full-screen motion, where a lower cap shows as blocking.
Audio, and what you can actually capture
Whether you can record system audio depends on the browser and on what you share. Chrome offers to include audio when you share a tab, and usually will not when you share a whole screen. Firefox and Safari are more restrictive still. Microphone capture is separate and more consistently available.
If the audio option is missing, that is the browser deciding, not this tool. Sharing a tab rather than a display is the usual workaround.
Limits worth knowing before you record something long
It does not work on iOS at all. Safari on iPhone and iPad has no screen capture API, so the page will tell you rather than fail halfway through.
It requires a secure context. Over plain HTTP the browser will not offer capture.
The recording is held in memory until you stop it. A long session at a high bitrate can grow to a size the tab cannot hold, so for anything lengthy record in segments rather than one continuous take.
WebM is not universally accepted. Some editors and older tools want MP4, in which case convert afterwards.
Questions
Is my recording uploaded?
No. The browser captures frames and a recorder in the page assembles them. The file exists only in the tab until you download it, and it is never sent anywhere.
Why can I not record audio?
Because the browser is not offering it. Chrome generally allows tab audio but not full-screen audio, and other browsers are more restrictive. Try sharing a single tab rather than a whole display.
Does this work on iPhone or iPad?
No. iOS Safari does not implement screen capture, so there is nothing for this to use. The built-in iOS screen recording is the alternative.
Can I get an MP4 instead of WebM?
Not directly - the browser records WebM. Convert the result afterwards if you need MP4 for an editor or a platform that will not take WebM.