About fixmic
fixmic is a free microphone test that does one thing well: tell you what is wrong with your mic in plain English.
Why this exists
Every other mic-test site shows you a moving bar and calls it done. That tells you the mic is connected — it does not tell you whether your audio will sound good on a call. fixmic measures four real problems (clipping, background noise, weak signal, room echo) and explains exactly which one is hurting you.
How it works
When you click 'Start test', your browser asks for permission to use the microphone. The audio data is processed entirely in your browser using the Web Audio API — nothing is uploaded to any server, ever. When you close the tab or click 'Stop', the microphone access is released.
What we measure
Six raw measurements: peak level, RMS average, noise floor, dynamic range, dominant noise frequency, and reverb tail. Five diagnostic rules translate those numbers into actionable findings — for example, 'your signal is too loud and clipping' or 'your room echoes; record somewhere with more soft furnishings'.
Why it's free
Hosting, the domain, and development time aren't free. The plan is to support the site through Google AdSense — the same advertising network that pays for most independent websites — which is what makes the tool free for users and signup-free. Advertising is not yet running; when it goes live, the test itself will keep running entirely in your browser (the Web Audio API does not expose anything to ad scripts), and we will never sell, share, or have access to your audio.
Who built it
An independent developer who got tired of mic-test sites that did not actually help. The architecture is deliberately simple: React + Vite + static site generation, hosted on Cloudflare Pages.
Try the diagnostic
The fastest way to understand what fixmic does is to run it on your own mic.
Run the microphone test