Developer Essentials · Free Tool
Speaker Tester
Check your left and right speakers (or headphones) with a clean test tone — one channel at a time or both. Tones are generated on the fly with no audio files. Runs in your browser.
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Left▶
RightTone frequency
How it works
A Web Audio OscillatorNode generates a pure sine tone, and a StereoPannerNode sends it fully to the left channel, the right, or both. If you hear the tone from the correct side, that speaker works. Everything is synthesised live in your browser — no downloads, no files, nothing sent anywhere.