StudioWavePro — Online Audio Editor with 48+ Studio Tools

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This audio inverter performs one exact operation: it inverts the sound wave — every sample is multiplied by −1, turning the waveform upside down. Played alone, the result is indistinguishable from the original — ears don’t perceive absolute polarity. Its power appears the moment the audio is combined with another signal: if two takes of the same source are out of polarity, mixing them cancels instead of reinforcing, and the sound turns thin and hollow. Flipping one of them fixes it.

That makes this a troubleshooting and verification tool. The classic test: layer two recordings of the same thing — if the combination gets quieter or loses all its bass, they were fighting each other; invert one and the body comes back. The same trick, called a null test, verifies whether two files are truly identical: an inverted copy mixed with the original cancels to perfect silence only if nothing differs.

When to use

Fix a thin, hollow blend when layering two mics or takes of the same source.
Repair recordings made with a miswired (polarity-reversed) cable or mic.
Null-test two versions of a track to hear exactly what changed between them.
Prepare a signal for phase-cancellation tricks (e.g. removing common content between two files).
Conform clips to the same polarity before mixing them in a DAW.

How to use

Click "Open Polarity Inverter" below to launch the editor.
Drop in any audio file — MP3, WAV, OGG, M4A and FLAC are all supported.
Click Apply — the waveform flips; on its own it will sound identical.
Download as WAV or MP3, and combine it with the other signal in your DAW or editor.
If the combination now sounds fuller (or nulls to silence in a test), the flip did its job.

Tips

The quick diagnosis: if layering two similar recordings makes the result quieter or bass-less instead of louder, polarity is the first suspect. Flip one and compare.
A null test needs sample-accurate alignment: the inverted copy must start at exactly the same point as the original, or nothing cancels.
Polarity and phase aren’t identical concepts: polarity inversion flips the whole waveform instantly; phase shift is a frequency-dependent time offset. The "phase" button on mixing consoles actually does what this tool does.
Stereo files get both channels flipped together, so the stereo image is unaffected.
Applying the tool twice restores the exact original — the operation is perfectly lossless and self-inverse.

Frequently asked questions

What does inverting polarity actually do?: Every sample value is negated — +0.5 becomes −0.5 — turning the waveform upside down. The audio content is unchanged and sounds identical alone; only its interaction with other signals changes.
Why does my layered recording sound thin and hollow?: The two layers are (partly) out of polarity: where one waveform pushes, the other pulls, and they cancel — bass frequencies first. Invert one layer with this tool and re-combine; if the fullness returns, that was the problem. It is among the most common issues in multi-mic recording.
What is a null test and how do I do one?: A way to verify whether two files are identical: invert one, align it sample-exactly with the other, and play both together. Identical content cancels to silence; anything you still hear is exactly what differs. Engineers use it to verify lossless processing and compare versions.
Is polarity the same thing as phase?: Colloquially they get mixed up; technically no. Polarity inversion flips the sign of every sample instantly and equally. Phase shift delays frequencies by some amount of time. The console button labeled "ø" performs polarity inversion — this tool is that button.
Will inverting polarity change how my file sounds?: Played by itself: no, human hearing is insensitive to absolute polarity. In combination with other signals: potentially completely — that is the entire reason the tool exists.
Is the operation lossless?: Perfectly — negation at full floating-point precision, no filtering or re-encoding. Apply it twice and you have your bit-exact original back.

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.