Microphone not working in Slack
When your mic works elsewhere but not in Slack, the culprit is usually the input device chosen inside Slack or a missing permission. Confirm the mic works first, then fix Slack.
Test your microphone right now — it takes one click.
Run the microphone test →
Step-by-step fix
- First, confirm the mic itself works: run the CheckMyMic microphone test.
- In Slack, open Preferences → Audio & video → Microphone and select the correct input device.
- Check the input level and make sure you're not muted inside Slack.
- Grant Slack microphone permission at the operating-system level.
- Restart Slack and rejoin your call.
Frequently asked questions
My mic works in the browser test but not in Slack — why?
That points to Slack's own device settings. Open Preferences → Audio & video → Microphone and pick the same microphone that worked in the test.
Does Slack need separate mic permission?
Yes — even if your browser or system has access, Slack may need its own grant. Allow it in your OS privacy settings, then restart Slack.
Fixed it? Confirm with a quick test.
Run the test →