Screen recording.
Capturing the contents of a computer screen as a video file, with or without audio narration. Screen recording underpins async standups, walkthroughs, product demos, customer support, and training.
How it works in a browser
Modern browsers expose `navigator.mediaDevices.getDisplayMedia()` — the Screen Capture API. The browser asks the user which screen, window, or tab to share, then returns a `MediaStream` you can pipe into a `MediaRecorder` to produce a WebM or MP4 file.
How it works on the desktop
Native apps (OBS, QuickTime, Snagit, Camtasia, Loom desktop) hook into the OS's screen-capture frameworks (AVFoundation on macOS, the Desktop Duplication API on Windows, X11/Wayland on Linux).
Common file formats
WebM (VP8/VP9), MP4 (H.264 or H.265), MOV. WebM is the default in browsers because it requires no extra licensing. Screendog also lets you upload an existing file in these formats to transcribe it.
Frequently asked
Do I need an extension?
For browser-based recording, no. The Screen Capture API is built into Chrome, Edge, Firefox, Safari, Brave, Arc, and Opera.
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