Screen + Mic Recorder
Record your screen with your voice over it — two streams mixed into one file, in the browser.
How this processes your file
getDisplayMedia hands over the screen, and its audio track carries system or tab audio — what the computer is playing — rather than your voice. Narration needs the microphone, which is a separate stream, and MediaRecorder accepts only one. So both audio streams are routed through a Web Audio graph, each with its own gain, summed into a single output track, and that track is combined with the video into the stream that is actually recorded. The two gain controls are exposed because the balance matters and cannot be repaired later: narration buried under system audio is the standard complaint about screen recordings, and once the two are summed into one track there is no separating them again.
What the results mean
- Microphone
- Whether narration was captured. Refusing the permission still gives you a screen recording, just a silent one.
- System audio
- Whether the computer's own audio was captured. Platform-dependent and off unless you tick the box in the picker.
- Mix
- The relative levels the two were summed at. Permanent in the file.
- Format
- WebM on most browsers. Plays on the web; most video editors want it converted first.
Common problems and fixes
- My voice is too quiet under the system audio
- Adjust the mix while recording. Once the file is written the two are one track and the balance cannot be changed.
- No system audio was captured
- On macOS it is not available to web pages at all. On Windows and Linux in Chrome you have to tick the share-audio box in the picker, and it only appears for a tab or the whole screen, not a single window.
- The recording stopped on its own
- Ending the share from the browser's own bar stops the recording, which is deliberate — the capture has ended, so there is nothing further to record.
Frequently asked questions
Why does the plain screen recorder not include my voice?
Because getDisplayMedia's audio track is system audio, not the microphone. Adding narration means capturing a second stream and mixing the two, which is what this tool does.
Can I change the balance afterwards?
No. The two sources are summed into a single audio track when the file is written, and there is no way to separate them again. Set the mix before or during the recording.
Is anything uploaded?
No. Both streams are mixed and encoded inside this tab and the file is offered as a download. Closing the page without downloading loses it.