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Fast links to every tool and troubleshooting guide on DevicePrep.
Main
Team
The authors behind DevicePrep’s diagnostic tools and troubleshooting guides.
- Adrian Reyes
Editor-in-Chief, DevicePrep
Leads DevicePrep’s editorial strategy and turns recurring call issues into clear, test-first troubleshooting guides.
- Nikhil Desai
Technical Review Lead (Audio/Video), DevicePrep
Reviews DevicePrep guides for accuracy across browsers, operating systems, and the constantly changing UI of meeting apps.
- Simone Park
Product Engineer (Diagnostics), DevicePrep
Builds browser-based diagnostic tools and writes the technical explainers that help people interpret results quickly.
Tools
All-in-one
- Pre-Call Checklist
Run all critical tests in under a minute before joining.
Audio
- Microphone Test
Check input levels, switch mics, and record an 8s playback.
- Microphone Clipping Test
Detect clipping/distortion and find safe input gain headroom.
- Background Noise Test
Estimate ambient mic noise level and get quick fixes to sound clearer.
- Speaker Test
Play left/right channels and adjust output volume safely.
- Echo Test (Loopback)
Loop your mic to your speakers/headphones to verify the full audio path.
Browser
- Browser Test
Confirm WebRTC, getUserMedia, WebGL, cookies, and storage.
- Screen Share Test
Test screen sharing permissions and preview resolution/fps before meetings.
- Device Check
Detect microphones, cameras, and speakers your browser can access.
Display
- Screen Test
Cycle fullscreen patterns for dead pixel and color checks.
Input
- Keyboard Test
Highlight pressed keys and track simultaneous key presses.
- Mouse Test
Verify clicks, scroll, and movement tracking on a canvas.
Network
- Network Test
Measure latency, jitter, and download speed for calls.
- Upload Speed Test
Estimate upload bandwidth for video calls with a small, safe upload sample.
- Ping & Jitter Test
Measure ping, jitter, and packet loss with lightweight requests.
Video
- Webcam Test
Preview your camera, verify resolution, and mirror view.
- Webcam FPS Test
Measure real frame rate and dropped frames to diagnose choppy video.
- Webcam Lighting Test
Preview your camera and estimate if your video is too dark or washed out.
- Webcam Flicker Test
Check for lighting flicker/banding that makes video look unstable.
Troubleshooting guides
20 guides — newest first.
- Fix Bluetooth Headset Mic Not Working on Windows 11
Windows 11 (Bluetooth headsets)
Make sure Windows is using the headset microphone (hands-free), then fix permissions and app device selection so people can hear you.
- Unblock Camera and Microphone Permissions in Your Browser
Chrome/Edge/Firefox/Safari
Reset camera/microphone blocks in Chrome, Edge, Firefox, or Safari so prompts appear again and your devices work in calls.
- Fix Black Screen from Camera on macOS
macOS
Fix a Mac camera black screen by releasing the camera from other apps, resetting permissions, and validating with a live Webcam Test.
- Fix Camera Not Working in Zoom
Zoom (desktop/web)
Confirm the camera is detected and shows a preview, then fix Zoom video settings, permissions, and “camera busy” conflicts.
- Fix Echo and Feedback in Zoom, Teams, and Meet
Zoom/Teams/Meet
Stop echo fast by switching to headphones, matching devices in your call app, and validating your audio path with quick tests.
- Fix Keyboard Not Working in Your Browser
Browser (Chrome/Edge/Firefox)
Use the DevicePrep Keyboard Test, then fix focus, shortcuts, and accessibility settings so key presses register.
- Fix Microphone Not Working in Google Meet
Google Meet (web)
Fix Google Meet mic issues by confirming the mic signal, selecting the right input, and resetting browser/OS permissions so people can hear you.
- Fix Microphone Not Working on iPhone and iPad
iPhone/iPad (iOS/iPadOS)
Check app mute, allow microphone permissions in iOS, and retest with an online Mic Test.
- Fix Microphone Not Working on macOS
macOS
Allow microphone access, pick the right input, and confirm with the DevicePrep Mic Test on your Mac.
- Fix Microphone Not Working on Windows 11
Windows 11
Confirm Windows and your browser can detect the mic, then enable permissions and pick the correct input so apps hear you on Windows 11.
- Fix Microphone Issues in Zoom
Zoom (macOS/Windows)
Unmute, pick the right mic, reset permissions, and use the online Mic Test to confirm Zoom can hear you.
- Improve Slow Network for Video Calls
Any
Measure ping/jitter and upload speed, then reduce congestion and Wi‑Fi instability for smoother Zoom/Teams/Meet calls.
- Fix No Sound from Speakers on macOS
macOS
Choose the right output, raise volume, and confirm both channels with the DevicePrep Speaker Test.
- Fix Camera Not Working in Microsoft Teams
Microsoft Teams (macOS/Windows/Web)
Use the DevicePrep Webcam Test, then fix permissions, device selection, and camera conflicts so Teams can see you.
- Fix Microphone Issues in Microsoft Teams
Teams (desktop/web)
Select the right mic, allow OS or browser permissions, and verify with the online Mic Test before joining Teams.
- Fix Webcam Not Detected on Windows 11
Windows 11
Turn on camera access, refresh drivers, and test with the DevicePrep Webcam Test and the Camera app.
- Fix Webcam Not Working in Chrome
Chrome (Windows/macOS)
Allow the site, choose the right camera in Chrome settings, and verify with a live Webcam Test so Chrome can show video again.
- Fix Webcam Not Working in Firefox
Firefox (Windows/macOS)
Allow camera access in Firefox, select the right device, and confirm with the DevicePrep Webcam Test.
- Fix Zoom Speaker Audio (Run the Built-in Test)
Zoom
Use the DevicePrep Speaker Test and Zoom's own test to pick the right output and hear the call.
- Fix No Sound on Windows 11 (Speakers or Headphones)
Windows 11
Run the DevicePrep Speaker Test, then fix output selection, Volume mixer routing, and driver issues on Windows 11.