StudioWavePro — Online Audio Editor with 48+ Studio Tools

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The Channel Extractor turns one chosen component of a stereo file into a clean mono track. The obvious two are Left only and Right only — the rescue tools for recordings where one channel is broken, noisy, or carrying a different source. The interesting two are Mid and Side: Mid ((L+R)/2) isolates what both channels share — typically lead vocals, bass, kick — while Side ((L−R)/2) isolates what differs between them — reverb, ambience, wide-panned instruments.

Mid/side extraction is a small superpower for remix and repair work. Want to hear exactly what a karaoke-style vocal remover would remove? That’s the Mid. Want to hear the room and the stereo effects with the lead vocal gone? That’s the Side. It’s also the honest way to inspect how wide a mix really is before reaching for the Stereo Widener.

When to use

Rescue a recording where one channel is dead, distorted, or noisy — keep the good one.
Split an interview where each speaker was recorded on their own channel.
Isolate the Mid to hear the centered content (vocals, bass) by itself.
Extract the Side to study a mix’s ambience and stereo effects — or to sample them.
Pull one channel of a device that records different sources to L and R.

How to use

Click "Open Channel Extractor" below to launch the editor.
Drop in a stereo audio file — MP3, WAV, OGG, M4A and FLAC are all supported.
Choose the component: Left only, Right only, Mid (L+R)/2, or Side (L−R)/2.
Click Apply — the output is a mono file containing just that component.
Download as WAV or MP3.

Tips

Two-person interviews recorded one-voice-per-channel: extract Left, download, Undo, extract Right — now each speaker has their own file for separate cleanup.
The Side channel of a commercial track is a free "ambience stem": no lead vocal, all the space. Producers sample exactly this.
If the Side extraction is almost silent, the source is effectively mono — widening it later won’t do much, which is useful to know in advance.
Vocal removal (the Karaoke tool) is essentially "keep the Side": comparing the Karaoke output with this tool’s Side output makes the technique tangible.
For keeping both channels but rebalancing them, use Stereo Balance instead; for collapsing both equally, the Mono Converter.

Frequently asked questions

How do I extract just the left or right channel from a stereo file?: Open the Channel Extractor, drop in the file, pick "Left only" or "Right only," and click Apply. The output is a mono file of just that channel, downloadable as WAV or MP3.
What are Mid and Side, in plain terms?: Mid is everything the left and right channels agree on — the center of the mix, where vocals, bass and kick usually live. Side is everything they disagree on — reverb, ambience, instruments panned outward. Any stereo file can be losslessly described as Mid plus Side, and this tool lets you listen to either alone.
One channel of my recording is damaged — can I save the audio?: Yes, if the other channel is intact: extract the good channel and you have a clean mono recording. This is the standard rescue for failed cables, dead mics, and one-sided interference.
Can I use the Side channel to remove vocals?: The Side channel has no centered content, so center-panned lead vocals vanish from it — that is the classic karaoke trick. The dedicated Karaoke tool does this with more control (it keeps bass and balance more musically), but extracting Side shows you the raw version.
Why is my extracted Side channel nearly silent?: Because the source is essentially mono — both channels carry almost identical signals, so their difference is tiny. Common with voice recordings, AM-radio rips, and mixes that were never really stereo to begin with.
Is the extraction lossless?: Left and Right extraction copy the samples untouched. Mid and Side are simple per-sample arithmetic — (L+R)/2 and (L−R)/2 — at full precision. Export as WAV and nothing is approximated.

StudioWavePro is a complete audio editor with 48+ studio-grade tools in one workspace. Trim, master, EQ, time-stretch, denoise, remove vocals, detect BPM and musical key, generate metronomes, and more. Editing tools

Audio Trimmer — crop a track to a selected region

Mute Section — silence a selected region

Reverse Audio — play the track backwards

Fade In/Out — ramp volume at start or end

Silence Trimmer — strip leading and trailing silence

Silence Gap Inserter — insert silence at a chosen position

Audio Looper — repeat a section N times

Audio Splitter — cut a track into multiple parts

Audio Merger — join multiple files end-to-end

Silence Splitter — auto-split at silent gaps

Crossfade Joiner — join clips with overlapping fades

Time and pitch

Speed Changer — speed up or slow down (with optional pitch preservation)

Pitch Shift — change pitch without changing tempo

Tempo Detector — estimate the BPM of a music track

Key Detector — estimate the musical key

Metronome Generator — create a click track at any BPM

Effects

Volume — make a track louder or quieter

Bass Boost — lift the low end

Treble Boost — lift the high end

Low Pass Filter — cut off high frequencies

High Pass Filter — cut off low frequencies (remove rumble)

Equalizer (3-band) — low / mid / high tonal shaping

Equalizer (10-band) — fine-grained tonal control

Echo — add repeating echoes / delay

Distortion — overdrive, fuzz, and lo-fi grit

Stereo Balance — shift the L/R center of a stereo mix

Stereo Widener — make stereo narrower or wider

Vocal Remover — karaoke (center-channel removal)

Hum Remover — strip 50/60 Hz mains hum

Mastering and analysis

Normalize — maximize volume without clipping

Compressor — even out loud and quiet parts

Loudness Meter — measure peak, RMS, and LUFS

Mono Converter — collapse stereo to mono

Channel Extractor — pull L, R, Mid, or Side

Sample Rate Converter — resample to 44.1, 48, or 96 kHz

Polarity Inverter — flip waveform for phase alignment

DC Offset Remover — center waveform around zero

Audio Visualizer — render an animated video from audio

StudioWavePro supports MP3, WAV, OGG, M4A, and FLAC files. Exports include WAV and MP3. This app requires JavaScript to run. Please enable JavaScript in your browser.