日本語English

Webcam Test

Check your camera, its real resolution and frame rate in one click. If it doesn’t work, you’ll see the cause — permission, another app using it, not connected — and how to fix it. Nothing is recorded or uploaded.

On-device・No upload

Your files and input are processed only inside your browser on this device and are never uploaded to our servers.

Click “Start camera” and your browser will ask for permission. Choose “Allow” to see the video. The video is shown only on this device and is never recorded or uploaded.

Video is only displayed on your screen — never recorded, stored or uploaded.

How to use

  1. Click “Start camera” and choose “Allow” in your browser’s prompt.

  2. When the video appears, check that permission, connection, frame rate and brightness are all OK in the diagnostics panel.

  3. If you have several cameras, switch them under “Camera” and try HD / Full HD / 4K under “Requested resolution”.

  4. If it doesn’t work, follow the steps shown for the error (allow permission, close other apps, etc.) and click “Try again”.

  5. Optionally save the current frame as a PNG with “Save snapshot”.

What it does

Automatic diagnosis of failures

Permission denied, no camera, camera in use by another app, unsupported resolution or a non-HTTPS page — each is detected separately, with fix-it steps for your browser and OS.

Measures real resolution and FPS

Shows the resolution and frame rate actually delivered — not just what was requested — updated every second. Great for verifying camera specs or spotting low FPS caused by dim light.

Detects darkness and frozen video

Flags images that are too dark or too bright, and video that has not changed for several seconds (for example a closed privacy shutter).

Camera details

Lists the supported ranges (resolution, FPS, zoom, focus…) and current settings that your browser exposes.

Use cases

  • Make sure your camera works before a Zoom, Teams or Google Meet call
  • Find out why you see “camera not found” or “cannot start camera”
  • Verify a new webcam really delivers Full HD or 4K
  • Adjust lighting and framing before a meeting

Capability matrix

FeatureSupportNotes
Live preview (mirror, guide lines)Supported—
Measure resolution, FPS, aspect ratio, brightnessSupported—
Error diagnosis with fix-it stepsSupportedChrome / Edge / Safari / Firefox / iOS / Android / Windows / Mac
Switch between cameras / front and backSupported—
Save a snapshot (PNG)Supported—
Camera capability ranges and settingsPartialFirefox and Safari expose fewer details
RecordingNot supportedNot offered, to protect your privacy
Changing camera settings (exposure, white balance…)Not supported—

Limits & notes

  • Camera permission is per browser and per site. Once denied, you must re-allow it in the browser settings.
  • On Windows and some systems the camera cannot be opened while another app (Zoom, Teams…) is using it.
  • “Requested resolution” is a request; unsupported values fall back to the nearest the camera offers (shown as “Actual resolution”).
  • In-app browsers (e.g. inside social apps) may block camera access.

Privacy & safety

Your camera video is only displayed on your screen — never recorded, stored or uploaded. Brightness and FPS are calculated in your browser. A file is saved to your device only when you click “Save snapshot”.

FAQ

I denied camera access. How do I undo it?
In Chrome, click the site-info icon at the left of the address bar, set “Camera” to “Allow” and reload. In Safari use Settings → Websites → Camera. When a denial is detected, the tool shows steps for your browser.
It says it cannot start the camera
Usually another app (Zoom, Teams) or another tab is using the camera. Close them and click “Try again”. On Windows also check Settings → Privacy & security → Camera → allow desktop apps.
My 4K camera doesn’t show 4K
Set “Requested resolution” to 4K. If it is still lower, a USB hub or USB 2.0 port may lack bandwidth — connect the camera directly to a USB 3.0 port.
The video is dark or choppy
In dim light cameras lengthen exposure, which lowers the frame rate. Add light in front of you. You can measure FPS and brightness here.
Is my video sent anywhere?
No. It is only displayed on your screen, never recorded or uploaded.

Related tools

Microphone Test

Start the mic to see input level (dBFS), waveform and spectrum. Clipping, noise and mute are detected automatically, and a guided speak test rates whether your mic is good enough for meetings. Nothing is uploaded.

Speaker Test

Press a button to play the left, center or right channel, a 20 Hz to 20 kHz sweep, or in-phase and out-of-phase noise. Every sound is generated in your browser, and the default volume is a quiet −24 dBFS.

Browser Inspector

A clear list of everything your browser shows to websites without asking — browser, OS, screen, language, GPU — plus support for 60+ features such as WebGPU and video codecs. Results are shown on the spot and never sent anywhere.

Keyboard Test

Each key lights up on the on-screen keyboard as you press it, so dead keys stand out immediately. Supports US and Japanese JIS layouts with numpad, and measures maximum simultaneous keys and chatter (one press registering twice).

Mouse & Wheel Test

Test all five mouse buttons and the wheel, and automatically catch “chatter” — single clicks registering as double clicks. Double-click interval, wheel counts, polling rate (Hz) and drag breaks are measured in numbers.

Last updated: