Help centre

Use these guides when a quick device check points to a permission, app, Bluetooth, or browser problem.

Nothing you say or show leaves this device.0 network requests carrying media ยท 0 bytes uploaded
See the proof

Watch the live counter. It stays at zero for media uploads while you run a mic, camera, or speaker check.

Verify it yourself. Open DevTools, choose Network, run a test, and look for uploads. In Chrome or Edge press Ctrl+Shift+I. In Firefox press Ctrl+Shift+E.

CSP guardrail. Content-Security-Policy is a browser rule that limits where this page can send data; media is not allowed to leave this page.

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Troubleshooting by symptom

Start with the symptom closest to what you see: blocked microphone, black camera preview, silent Bluetooth output, or a meeting app that uses the wrong device. Each guide links back to the matching test so you can verify the fix immediately.

The guides are intentionally practical. They focus on the browser, operating-system, and app settings that most often affect a mic, webcam, or speaker check.

Privacy and permissions

Camera and microphone prompts are controlled by the browser, not by MicAndCam. The permission guide explains why that is good for safety and why a blocked setting must be changed from the browser or operating system.

The local-only guide explains how the privacy counter and automated network tests support the claim that media stays on your device.

Fix microphone permission in Windows 11Step-by-step microphone permission checks for Windows 11, Chrome, Edge, Firefox, and browser-based mic tests.Fix a black webcam screenPractical checks for a black webcam preview in Chrome, Edge, Firefox, Safari, Zoom, Teams, and browser camera tests.Test before Zoom, Teams, or MeetA quick pre-call checklist for checking microphone, webcam, speakers, permissions, and matching devices before a meeting.Test Bluetooth speakers and headphonesCheck Bluetooth output, left and right channels, wake-up delays, headset mode, and meeting-app audio routing.How browser permissions workPlain-language guide to getUserMedia prompts, blocked permissions, secure contexts, device labels, and resetting mic or camera access.How the local-only privacy proof worksLearn how MicAndCam tests microphones, webcams, recordings, snapshots, and speaker tones in the browser without media uploads.

FAQ

Which guide should I start with?

Use the page that matches the symptom. For blocked microphone access, start with the Windows permission or browser permission guide. For a camera that opens but stays black, start with the black-screen guide.

Is an online mic or webcam test safe and private?

It can be when the tool runs locally. MicAndCam analyzes microphone levels, camera preview, snapshots, and recordings in your browser and does not upload media. You can verify this with the live counter or your browser's Network panel.