Video call test. Before the interview, not during it.
Check your camera, microphone, speakers and connection in two minutes, against what Zoom, Teams and Meet need. The picture and sound stay on this page.
7 checks · about 3 minutes
- Browser and system
- Webcam
- Microphone
- Speakers
- Audio delay
- Internet
- Browser settings
One check after another, with your progress along the top and a plain verdict on each. Nothing you show the camera or say into the microphone leaves this page.
In short
Video call test: the answer first
A video call test checks your camera, microphone, speakers and connection in about two minutes against what Zoom, Teams and Meet need. It also checks whether latency rises when the line is busy and whether UDP, which calls prefer, reaches the internet.
Reading your result
- Fine here, broken in the app
- The app chose a different camera or microphone. Pick the device that worked here in the app's settings.
- Freezes with good speed
- That is jitter, usually Wi-Fi interference. Sit closer to the router or use a cable.
- UDP blocked
- Calls fall back to slower paths when UDP cannot get out, which often happens on strict office or school networks.
What it measures
Measured here, not assumed.
In the order the checks run.
- Camera
- Live picture, the stream's resolution, a frame rate counted from the frames that arrive, and whether the light is good enough to be seen clearly.
- Microphone and speakers
- A level meter and a clip you can play back, the room's background noise, and a left and right tone.
- Internet
- Latency, jitter, download and upload over parallel streams against the 1.5 to 3 Mbps a call needs each way. Jitter is what freezes video on a fast connection.
- Latency under load and UDP
- How much latency rises while the line downloads and uploads, graded on Waveform's bufferbloat bands, and whether UDP reaches the internet. For that, the browser asks Google's public STUN server, stun.l.google.com, for its public address; that one request is the only traffic that leaves this site, and it shows Google your IP address. Packet loss is not measured.
- Browser and settings
- Browser version, cookies and pop-ups, which call links and web clients depend on.
If it fails
The usual failures, and what fixes each.
- The camera or microphone was refused
- Click the camera icon in the address bar and choose Allow, then run again. Check the system privacy settings for the browser and the call app.
- Video freezes but the speed looks fine
- That is jitter, usually Wi-Fi interference. Sit closer to the router or use a cable, and pause other devices.
- It works here but not in Zoom or Teams
- The app chose a different camera or microphone. Pick the device that worked here in the app's settings, and allow the app in the system's privacy settings.
Where a browser stops
What it cannot tell you.
- How you look and sound in the call app itself, which picks its own devices and applies its own processing.
- How much echo the call app would cancel; the microphone check hears the raw path.
- The other person's connection.
- Packet loss and NAT type. Both need servers at the other end that we do not run.
Privacy
Nothing leaves this page.
The camera and microphone are read on this page and stopped as soon as they have been measured. The clip you can play back lives in the browser's memory and is discarded when you leave. The location check discards the position. The internet test sends random bytes to this site and nothing else. The result is stored nowhere unless you ask for it by email, and then only the fact that an email was sent is kept.
Questions
Video call test, answered
- How do I test my camera and microphone before a Zoom call?
- Run the check above. It opens the camera and microphone on this page, shows the picture and a level meter, and tells you if either is refused or not found. Then pick the same devices in Zoom's settings.
- What internet speed do I need for a video call?
- About 1.5 Mbps each way for a one-to-one call and 3 Mbps or more for group calls in HD. Steadiness matters more than speed: high jitter freezes video on a fast connection.
- Is anything recorded?
- No. The camera and microphone are read on this page and stopped. The clip you can play back stays in the browser's memory and is discarded when you leave.
- Does any traffic leave this site?
- One request: the browser asks Google's public STUN server for its public address to check UDP. Everything else, including the speed test, talks only to this site.
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