Webcam Test

Use the actual negotiated stream settings rather than assuming a requested 1080p or 4K mode was delivered.

Camera

Preferred resolution

Mirror preview

—Actual video size

—Track frame rate

—Measured preview FPS

—Aspect ratio

Choose a cameraThe live preview stays in this browser. Requested resolution and reported track settings can differ because the browser and camera negotiate the stream.

Run a longer FPS sample Use camera as a mirror List media devices Test microphone

What the browser can measure

Start with a functional check, measure only what the browser can actually expose, then retest after one change.

ConnectChoose the actual browser-visible device or grant permission when required.

TestConfirm basic signal, input, output, preview or display behavior.

MeasureUse browser-exposed levels, timing, resolution, FPS, axes or event data.

DiagnoseCompare the symptom with the specific diagnostic instead of relying on one number.

RetestRepeat after changing the device, cable, permission, browser or system setting.

Pre-call Mic Keyboard Mouse Gamepad Display Permissions

Browser boundary
These tools observe browser APIs and local media/event streams. They cannot certify hardware condition, bypass denied permissions, or expose measurements the browser/OS does not provide.

What this tool checks

Run a private webcam preview with device and preferred-resolution controls, actual negotiated size, track FPS, measured preview FPS, mirror/fullscreen and snapshots.

How to use the result

Use the actual negotiated stream settings rather than assuming a requested 1080p or 4K mode was delivered.

Privacy & browser limits

Device streams and input events used by this page are handled in your browser unless the page explicitly says otherwise. Permission, label, timing and hardware-field availability depend on the browser and operating system.

Requested camera constraints and negotiated track settings are separated

Actual width/height/frameRate come from the active track/video element, while requested resolution is only a preference. Permission, no-device and secure-context states are surfaced explicitly.

Use this result with confidence

Requested resolution and delivered resolution can differ

Browser camera constraints are requests rather than guarantees. The camera, operating system, driver, browser, and current device load can negotiate a different width, height, or frame rate. Compare the requested preset with the actual MediaStreamTrack settings after permission is granted, especially when evaluating whether a conferencing or recording setup can really deliver a target mode.

A local preview is not the same as an end-to-end call

The webcam can look smooth in a direct browser preview while a video meeting still suffers from encoding, upload bandwidth, CPU load, background effects, or remote network conditions. Use this test to isolate camera access and local capture quality. Use the real conferencing or streaming application when the question is how the complete communication path performs.

Snapshot quality depends on the negotiated video frame

A canvas snapshot captures the frame the browser is currently receiving, not necessarily the camera sensor maximum. Exposure, focus, lighting, scaling, and browser processing all influence the result. Compare snapshots under the same lighting and requested settings when diagnosing a change instead of treating one image as a permanent camera-quality score.

Permission and privacy state are part of troubleshooting

A missing video can result from denied site permission, operating-system privacy controls, another application holding the device, an insecure context, or a disconnected camera. Check those layers before assuming hardware failure. Stop the stream when testing is finished so the browser releases the camera and the device indicator accurately reflects current use.