Browser-only — nothing is uploaded

Audio Test Kit

Free online tools to test and tune your audio.

Check your speakers, microphone, pitch, tone, and timing directly in your browser.

All tools

1 tool

Stereo Checker
Check if an audio or video file is mono, dual-mono, or stereo.

Why use Audio Test Kit

Browser-only
Files and microphone input stay on your device. We never upload your data.
No installs
Open a tool, use it, close the tab. No account, no plugins, no downloads.
Honest results
Browser audio is not a calibrated lab. We use estimate language and explain limits.