Record a screen, a window, or a browser tab, with sound, and save it as a video file. Nothing is installed: the browser’s own screen sharing captures the picture and its built-in encoder writes the file.
Start a recording
- Choose sound sources, format, quality, and frame rate in the rail.
- Press Start recording. The browser asks what to share.
- Pick a screen, window, or tab. With a countdown set, recording starts after it runs out.
- Pause and resume as needed, then press Stop recording, or use the browser’s own Stop sharing bar.
The recording then plays in the page, and the size and length appear under the controls.
Sound sources
- Tab or system audio records what the shared surface plays. In Chrome and Edge, a tab’s sound works everywhere; a whole screen’s sound only on Windows and ChromeOS. The share dialog has its own audio checkbox, and both have to be on.
- Microphone adds your voice, with the browser’s echo cancellation and noise suppression on, so speaker sound bleeding into the mic is reduced.
With both on, the two are mixed into a single track in the page before recording.
Quality and frame rate
| Setting | Bitrate | About per minute |
|---|---|---|
| High | 8 Mbps | 60 MB |
| Medium | 4 Mbps | 30 MB |
| Low | 1.5 Mbps | 11 MB |
The bitrate is a ceiling the encoder aims for, not a fixed size. 15 fps is enough for code walkthroughs and slides and keeps files small; 60 fps suits scrolling, animation, and games. Browsers deliver fewer frames when nothing on screen changes.
After recording
A browser recorder writes files that many players cannot seek in: WebM without a duration or index, MP4 in fragments. Once you stop, the recording is copied packet for packet into a fresh container. The picture is not re-encoded, and the file then scrubs normally in every player and editor. An MP4 recorded with Opus sound gets its audio converted to AAC, which more players accept.
From the finished recording you can go straight to the video trimmer, the video cropper, the video compressor, or the video workflow, and the file opens there without saving and reloading it.
Bug reports and demos
For a bug report, record just the tab at 30 fps with the microphone on, trim the dead time at each end, and compress to the size limit of your issue tracker. A tab capture excludes notifications and other windows, which keeps private details out of the recording.