Check left and right audio channels online. Play a generated test signal to identify the left and right headphone, or upload an audio/video file to inspect peak level, average loudness, balance, mono, duplicated mono and nearly identical stereo.
Useful when you need to confirm that headphones are worn correctly and left/right channels are not swapped. A high correlation close to 1.0 often means both channels are nearly the same. A strong balance offset means one channel is louder than the other.
✓Useful when you need to confirm that headphones are worn correctly and left/right channels are not swapped.
✓A high correlation close to 1.0 often means both channels are nearly the same.
✓A strong balance offset means one channel is louder than the other.
✓Solo playback sends one channel to both ears, making differences easier to hear.
✓Files are decoded in the browser and are not uploaded for analysis.
✓Browser codec support depends on the device and installed media stack.
Supported formats
This tool accepts these formats. Uncommon containers and modern web formats may be normalized or converted on the server before processing.
Audio
3GA
AAC
AC3
AIF
AIFF
AMR
APE
AU
CAF
EAC3
FLAC
KAR
M4A
M4P
M4R
MID
MIDI
MMF
MKA
MPC
MP2
MP3
MPGA
OGA
OGG
OMA
OPUS
QCP
RA
RMI
VOC
WAV
WEBA
WEBM
WMA
A damaged file or a non-standard codec can still fail even when the extension is supported.
