Headphone Test — Left / Right and Stereo Balance
Test your speakers online: left / right channel tones, a 20–200 Hz bass sweep and pink noise — all generated in your browser.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the speaker test tuned for headphones: put them on, press Left and the tone must appear only in your left ear, press Right for the right ear, then press Both — the tone should sit exactly in the middle of your head.
Headphones make channel mistakes painfully obvious in games and films, yet they are easy to make: earcups worn the wrong way around, a half-seated plug that drops one channel, or a balance slider nudged off center. If Both sounds shifted to one side, check the system balance first, then the cable and connector.
Tones are generated locally by the Web Audio API and panned hard left, hard right or centered — no files, no uploads. For a deeper check, the full test adds a 20–200 Hz bass sweep and pink noise to judge seal and low-end response.
Example. The left-channel control plays the selected tone through a stereo panner hard left, and the bass control sweeps from 20 Hz to 200 Hz over 8 seconds.
Limit. The tone frequency is clamped between 100 Hz and 2000 Hz, and the sweep never goes above 200 Hz.