How to Fix Audio Playing in Only One Ear
To fix audio playing in one ear, open the Stereo to Mono Converter and make a mono copy from the side that has the sound. A lopsided file has sound on one channel and silence, or near-silence, on the other. A mono copy of the good side plays in both ears. It takes a couple of minutes, needs no account, and your audio never leaves your device.
Why a recording plays in only one ear
A stereo file has two channels, left and right. If only one was fed a signal while recording, the file sounds fine on one side and empty on the other. The usual causes:
- A mono mic on a two-input interface or recorder. Plug one microphone into input 1 and record a stereo track, and that mic lands on the left channel while input 2, with nothing connected, records silence on the right.
- A camera or recorder set to stereo with one mic connected. Many cameras and field recorders record two channels by default, so with a single mic plugged in the second channel can end up empty. Details vary by device and input settings.
- A mono cable or adapter in a stereo jack. A mono (TS) plug in a stereo (TRS) input often feeds only one channel. So can a half-inserted plug.
- A track hard-panned before export. A voice panned fully to one side in an editor and exported plays on one side only.
- A two-person interview recorded split. Some setups put each speaker on their own side on purpose. That needs a mix of both sides, covered below.
Is it the file or your headphones?
If every sound on your device comes from one side (music, videos, system sounds), the fault is your headphones, the cable, or the balance setting in your operating system's sound settings, and no file edit will help. Test another file first. If that one plays in both ears and only this recording is lopsided, the file is the problem, and the rest of this guide applies.
Check which side has the sound
The Channel Splitter shows which channel holds the audio: drop the file in and it lists each channel with its peak level in dB, or the word "Silent" when a channel is completely empty.
One catch: "Silent" only appears for true digital silence. A channel with faint hiss or a little bleed from the other mic won't say "Silent". It shows a very low peak instead, far below the other side. Treat that as the dead side too. You can also play each channel there to hear what's on it.
How to fix audio playing in one ear: change stereo to mono from the good side
Once you know which side has the sound, use that side to convert stereo to mono:
- Open the Stereo to Mono Converter and drop your file into the upload box, or click it to choose the file.
- Under "Mono from", pick "Left only" or "Right only", whichever side has the sound.
- Press the play button to preview. The preview updates live, so you can switch between options while it plays and hear the difference.
- Choose an export format. WAV is the default and is lossless. MP3 gives a smaller file. Opus is also offered in browsers that support it; it doesn't appear in Safari.
- Click the export button (it reads "Export WAV", "Export MP3", or similar, depending on the format). WAV and MP3 come out as a 1-channel mono file. An Opus export may store the same signal on two identical channels, which plays the same way: in both ears.
To start over with a different file, click "Reset File". For a general walkthrough of the converter beyond this one problem, see How to Use a Stereo to Mono Converter (Free).
Why a mono file plays in both ears
A mono file has a single channel, and players send that one channel to both the left and right speakers or earcups. Instead of a full side and an empty side, you hear the same signal in both ears, centered. That's why converting stereo audio to mono from the good side fixes the problem instead of moving it around.
When to mix both sides instead
If each side holds a different voice, as in a split interview, picking one side throws away half the conversation. Choose "Mix left + right". It adds the two channels and halves them, (L+R)/2, so both voices end up in the single mono channel.
Don't use the mix for a file where one side is simply empty. Averaging a full channel with a silent one halves the level, so the result comes out about 6 dB quieter than picking the good side alone. The converter spots this when you load the file: if one side is silent or far quieter than the other, it tells you which channel has the sound and suggests "Left only" or "Right only", which gives you the same sound at full level. If a mixed interview ends up quieter than you'd like, raise it afterwards with the Volume Normalizer.
The converter also checks the two sides when you load a file. If they're largely out of phase, mixing them would cancel much of the sound, and the tool warns you and suggests using Left only or Right only. What Is Phase Cancellation? explains why that happens.
Troubleshooting
The exported file still plays in one ear. Make sure you're playing the new exported file, not the original; the names can look alike. To confirm, load the export into the Channel Splitter: a mono WAV or MP3 shows a single channel, and any file that has both sides filled shows two similar peak levels instead of one "Silent".
The one-sided audio is inside a video. Pull the soundtrack out first with Video to Audio, fix it in the Stereo to Mono Converter, then replace the original audio track with the fixed file in your video editor.
The good side is noisy or rough. Fix the channel problem first, then clean up the mono file. How to Clean Up a Zoom Recording covers voice recordings from calls, and How to Improve a Bad Recording covers the wider set of fixes.
Preventing it next time. Record a single mic as a mono track, or set that input to mono, instead of a stereo track with one empty side. On cameras, check the input settings before recording. How to Record a Podcast With an Audio Recorder walks through a recording setup from the start.
Related tasks
For background on what the two channels are, read Mono vs Stereo: What's the Difference?. If the recording came from a phone and also sounds thin or noisy, How to Clean Up a Phone Recording picks up where this guide ends. For more step-by-step fixes, browse the audio how-to guides.
Frequently asked questions
Why does my recording only play in my left ear? Most often a single microphone was plugged into input 1 of a two-input recorder or interface and recorded as a stereo track. Input 1 is usually the left channel, so the voice lands on the left and the right channel records silence. A mono cable in a stereo jack or a track panned hard left before export can cause the same thing.
Will converting to mono lower the quality? Not when you take the good side. The mono file is a copy of that channel, so it keeps everything the channel had; the empty side held nothing worth keeping. Exporting as WAV is lossless, so nothing changes in the sound. MP3 is a lossy format, so choose it only if you need a smaller file and accept a small quality trade-off.
Can I fix one-sided audio without converting to mono? Yes, in principle. In a desktop audio editor or DAW you can copy the good channel onto the empty one and export a stereo file with the same sound on both sides. That takes more steps, though, and the result sounds the same as a mono file on headphones. Converting to mono from the good side is the simplest fix, and the file plays in both ears.
Is my audio uploaded when I fix it? No. The Stereo to Mono Converter and the Channel Splitter process your file in your browser, on your own device. Your audio never leaves your device, so there's no upload wait and no copy of your recording on someone else's server. You don't need an account either: open the page, load the file, and export.