Zoom microphone test
Check that your microphone reaches the browser first, then work through the four Zoom settings that account for almost every "we can't hear you" in a Zoom meeting.
- No signup
- Works before you join
- Nothing uploaded
Check your microphone
Your browser will ask for permission. Speak a full sentence at your normal volume — tapping the microphone tells you nothing useful.
Audio is analysed on your device. Nothing is uploaded and nothing is stored.
The microphone is not available
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Test the microphone here first, then in Zoom
The test above answers one question: does your microphone reach an application on this machine at a usable level? That is worth establishing before you open Zoom, because if the answer is no, nothing inside Zoom will help and you will spend ten minutes in the wrong settings panel.
If the meter here moves and the playback is intelligible, your hardware, your driver and your operating system permissions are all fine. Any remaining problem is inside Zoom, and the sections below are in the order the causes actually occur.
Zoom's own microphone test
- 1
Open audio settings without joining a meeting
In the Zoom desktop client, click your profile picture, then Settings, then Audio. You do not need to be in a meeting, and testing here is better than testing in one — a meeting adds echo cancellation against the other participants' audio, which changes what you hear.
- 2
Run Test Speaker, then Test Mic
Test Speaker plays a tone; if you hear nothing, the problem is output, not input, and you have been debugging the wrong half. Test Mic records a few seconds and plays it back, which is the same principle as the playback in the tool above.
- 3
Read the Input Level bar while you speak
The bar should move well into its range on normal speech. A bar that barely twitches means low gain; a bar pinned at the far end means clipping. Both are fixed with the Input volume slider directly beneath it.
- 4
Turn off Automatically adjust microphone volume
This is on by default and it is the single most common cause of a Zoom microphone that fades in and out. Zoom rides your input gain up and down according to what it thinks is speech; on a quiet voice or in a noisy room it guesses wrong. Untick it and set the Input volume slider by hand while watching the level bar.
- 5
Join with computer audio, and check you are not muted twice
Zoom has a client mute, a hardware mute on many headsets, and — in webinars and large meetings — a host mute you cannot lift yourself. All three look identical from your side. The microphone icon in the meeting toolbar shows the client mute only.
The Zoom settings that quietly change how you sound
| Background noise suppression | Settings → Audio → Background noise suppression. On Auto, Zoom decides how aggressive to be. High removes fans and keyboards but also removes the quieter parts of a soft voice, which is why some people sound like they are cutting out. If your voice is quiet, set this to Low and raise your input level instead. |
|---|---|
| Original sound for musicians | Settings → Audio → Advanced. Enabling this exposes an Original Sound toggle in the meeting toolbar that bypasses echo cancellation, noise suppression and auto gain. It is the right setting for music and for a good microphone in a quiet room, and the wrong one for a laptop microphone next to a fan. |
| Echo cancellation | Settings → Audio → Advanced → Echo cancellation. Auto is correct for almost everyone. Setting it to Aggressive to fix a speaker echo will also clip the beginnings of your own words when both sides talk at once. Wearing headphones removes the echo at the source and lets you leave this alone. |
| Stereo audio and high-fidelity mode | Only available with Original Sound enabled, and only useful with a genuinely good microphone. On a headset it consumes bandwidth without improving anything a listener can hear. |
Why Zoom shows a different level from the browser
It is common to see a healthy meter on a browser test and a nearly flat Input Level bar in Zoom, and it does not mean either one is broken.
The first reason is device selection. Zoom stores its own microphone choice and does not follow the browser or the operating system default. If you plugged in a headset after Zoom was already running, Zoom may still be on the built-in array. The Microphone dropdown at the top of Settings → Audio shows which one it holds; Same as System is the setting that follows your operating system, and it is not the default on every install.
The second is gain staging. Zoom applies its own gain on top of the operating system's input level. Turning the operating system's level to 100 per cent and letting Zoom's auto-adjust pull it back down produces a signal that pumps; setting the operating system's level so speech peaks around three-quarters and disabling Zoom's auto-adjust produces a steady one.
The third is exclusivity. On Windows, an application holding a device in exclusive mode blocks others. If a browser tab has your microphone open and Zoom starts afterwards, Zoom can end up with silence. Close the tab that ran the test before you join the meeting — including this one.
Zoom on a phone, a tablet and in the browser
The mobile Zoom application has far fewer audio controls than the desktop client, which is usually an advantage: there is no auto-adjust to fight and no gain slider to set wrong. What there is instead is an operating system permission that can be off, and on iOS a microphone that a different application is still holding.
On iOS, check Settings → Zoom → Microphone. If a call from another application ended badly, iOS occasionally leaves the audio session claimed; force-quitting both applications clears it. On Android, check Settings → Apps → Zoom → Permissions → Microphone.
Zoom's browser client — the version that runs when you join without installing anything — uses the browser's microphone permission, which means the test above tests exactly the same path. If the tool on this page works and the browser client does not, the browser has given the device to another tab.
One thing the mobile application does that the desktop one does not: it routes audio through the phone's call subsystem when you join by phone audio rather than internet audio. In that mode your microphone settings are irrelevant, because the audio is going over the cellular network, not over Zoom's.
When Zoom is not the right tool for the call
Zoom reaches people who have Zoom. It cannot reach a landline, and its dial-out to ordinary phone numbers requires a paid Zoom Phone or audio-conferencing add-on with per-minute charges of its own.
If what you need is to call an actual telephone number — a parent's landline, a clinic, a bank in another country — a conferencing application is the wrong shape of tool, and the audio settings above do not apply. Telvio places calls to ordinary landline and mobile numbers over your internet connection, bills per second rather than per minute, and needs no account on either side. The person you are calling needs nothing at all.
The microphone advice transfers unchanged. The same headset, the same distance and the same input level that make you clear on Zoom make you clear on a phone call — with the caveat that the telephone network carries a narrower band of frequencies, so articulation matters more.
Bottom line
To test your microphone for Zoom: check it in the browser first to rule out hardware and permissions, then open Zoom's Settings → Audio, run Test Mic, and turn off Automatically adjust microphone volume so you can set the input level by hand.
If the browser test works and Zoom does not, the cause is almost always Zoom holding a different microphone than the one you tested, or another application holding the device exclusively. Both are visible in the Microphone dropdown at the top of Zoom's audio settings.
Frequently asked questions
How do I test my mic before a Zoom meeting?
Open the Zoom desktop client, click your profile picture, then Settings and Audio. Press Test Mic, speak, and listen to the playback. You do not need to be in a meeting. Testing outside a meeting is more reliable, because a live meeting adds echo cancellation that changes what you hear.
Why does Zoom say my microphone works but nobody can hear me?
Usually because Zoom has selected a different input device from the one you are speaking into. Zoom stores its own microphone choice and does not follow the system default, so plugging in a headset after Zoom started leaves it on the built-in microphone. Check the Microphone dropdown in Settings → Audio.
Should I turn off automatically adjust microphone volume in Zoom?
Yes, in most cases. Zoom's auto-adjust rides your input gain up and down based on what it believes is speech, and on a quiet voice or in a noisy room it guesses wrong, which sounds like fading in and out. Untick it and set the Input volume slider manually while watching the level bar.
What does original sound do in Zoom?
It bypasses Zoom's echo cancellation, noise suppression and automatic gain, sending your microphone signal largely untouched. That is right for music and for a good microphone in a quiet room, and wrong for a laptop microphone in a room with background noise, because nothing is removing that noise any more.
Why do I sound like I am cutting out on Zoom?
Two common causes. Background noise suppression set to High removes the quieter parts of a soft voice along with the noise — set it to Low and raise your input level instead. The other is packet loss on your connection, which sounds similar but affects video too and is not fixed by any audio setting.
Can Zoom call a regular phone number?
Not with a standard Zoom meeting licence. Dialling out to ordinary landline and mobile numbers needs Zoom Phone or an audio-conferencing add-on, both of which carry their own per-minute charges. For calling a normal telephone number, a dedicated calling app is the simpler and usually cheaper route.
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