No sound
Check device volume, tab mute, and your system output. Reconnect the device, then try again.
Retry the channel testStereoTest • Free online audio test
Stereo Test
Check left and right audio on your headphones or speakers. Start the test, then compare what you hear.
Start at low volume. No audio leaves your device.
Left & Right Sound Test
ReadyLower your device volume before playing any sound.
Listen in order: Left → Right → Both. Then tell us what you heard.
READY FOR PLAYBACK
Or check one channel
Left / Both / RightLeft: left output only. Right: right output only. Both: both outputs together, sounding centered.
Wear the L earcup on your left ear and R on your right. The unused side should stay quiet.
This choice adjusts test guidance and tone level. Choose your actual output device in system settings.
More audio tests
Explore balance, separation, mono, phase, and frequency. These controls change only the test sounds, not your system settings.
Stereo separation
Play alternating tones at the width and balance below. At 100% width and centered balance, each side should sound distinct.
Stereo balance
Move the sound between sides. At Center, it should not pull left or right.
Left to right sweep
100% widthAdjust how far the sound travels. At 100% width and centered balance, hear it move from left to right.
Stereo / mono test
StereoCompare separate channels with a shared signal. Stereo alternates sides; mono should sound centered. Balance and width do not affect this comparison.
Phase test
220 HzCompare matching and inverted signals. In phase usually gives speakers a firmer center; room acoustics can change the contrast.
Frequency presets
Open full frequency testPlay a fixed pitch through both sides. Listen for a steady tone, and stop if uncomfortable; do not raise volume to chase a faint high tone.
Blind Stereo Challenge
Guess the direction
Play a hidden direction, then choose where you heard it.
How to use the stereo test
1
Lower your device volume
Connect headphones or speakers. Wear headphones with L on your left, or sit midway between two speakers.
2
Press Start Stereo Test
Listen for the left output, then the right, then both together. The highlighted channel shows where the tone should come from.
3
Compare what you heard
Choose whether the directions sounded correct. If something was wrong, follow the matching check below and try again.
How to read your results
This left right sound test checks the path from your browser to your headphones or speakers. It is useful after reconnecting cables, switching devices, or changing sound settings.
- Left
- Only the left earcup or speaker should produce the tone.
- Right
- Only the right earcup or speaker should produce the tone.
- Both
- Both outputs play together. The sound should feel centered when you listen from an equal distance.
With speakers, both ears naturally hear the room. Identify the cabinet producing the tone, not which ear hears it. A soundbar's processing may make direction less distinct.
StereoTest does not record or measure your output. Your listening feedback helps you choose the next check; it cannot certify that your equipment is fault-free.
Common stereo problems
Change one thing at a time, then repeat the same test.
Left and right reversed
Check L/R markings, headphone orientation, cables, and software output routing.
Check each sideOne side quieter
Center system balance and compare headphone fit or speaker distance. Reset the page balance before the advanced check.
Check balanceBoth channels play together
If separate Left and Right tones sound centered, check system mono and virtual surround settings.
Compare stereo and monoNo stereo separation
Reset width to 100% and balance to Center. Disable crossfeed and other processing, then listen again.
Test separationBoth channels come from one side
Compare a second source. If one output stays silent, check the plug, adapter, cable, and speaker connections.
Repeat Left and RightGo beyond left and right
Open More audio tests when you need a closer check. The basic test works without changing any advanced settings.
Stereo balance test
Play a centered tone to check whether it pulls toward one side. The slider lets you compare positions; it does not correct your system balance.
Explore balanceStereo separation test
Listen to alternating sides or a continuous left-to-right sweep. Lowering width narrows the movement; reset it to 100% for distinct sides.
Try the stereo sweepMono on purpose?
Mono combines the channel information for listening through either ear. If that is your goal, the playback setting and a permanently converted file need different steps.
How to combine left and right audio channelsPhase and frequency
Compare matching and inverted signals on speakers, or play a fixed pitch. Room acoustics affect phase impressions, so use this as a listening comparison, not a wiring verdict.
Compare phase signals