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Invert Channel Phase

Invert the phase of one channel (for vocal removal effect)

Inverts the phase of the selected channel (left, right, or both). Commonly used for vocal reduction when later summed to mono or for creative stereo effects. Choose which channel to flip and export in your preferred format.

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: audio/*

Key Facts

Category
Media
Input Types
file, select
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

This tool inverts the phase of a selected audio channel, commonly used for vocal reduction when summed to mono or for creative stereo effects. Upload a stereo audio file, choose which channel to invert (left, right, or both), and export in your preferred format like MP3 or WAV.

When to Use

  • •When you need to reduce or remove vocals from a stereo audio track for karaoke or remixing purposes.
  • •When experimenting with stereo imaging and phase effects in audio production or sound design.
  • •When preparing audio files for mono summation to minimize phase cancellation issues in mixing.

How It Works

  • •Upload your stereo audio file in a supported format such as MP3, WAV, or FLAC.
  • •Select the channel to invert: left, right, or both channels.
  • •Choose the output format from options like MP3, AAC, WAV, or others.
  • •Process the file and download the resulting audio with the inverted phase.

Use Cases

Creating karaoke tracks by reducing lead vocals in stereo songs for sing-along events.
Designing unique stereo effects for electronic music or audio experiments in production.
Preparing audio stems for professional mixing where phase alignment is critical for clarity.

Examples

1. Vocal Reduction for Karaoke

Background
A DJ wants to create a karaoke version of a popular song by minimizing the lead vocals in a stereo mix.
Problem
The vocals are centered in the stereo field, making them difficult to isolate without affecting other instruments.
How to Use
Upload the stereo MP3 file, select 'both channels' to invert, and export as WAV for high-quality output.
Example Config
channel: both, outputFormat: wav
Outcome
The processed audio has reduced vocal presence when played in mono, making it suitable for karaoke use.

2. Stereo Effect in Music Production

Background
A music producer is working on an electronic track and wants to add spatial depth to a synth line using phase manipulation.
Problem
The synth line sounds flat and lacks stereo width, affecting the overall mix's immersion.
How to Use
Upload the synth audio file, invert only the right channel, and export as FLAC to maintain audio quality.
Example Config
channel: right, outputFormat: flac
Outcome
The inverted channel creates a wider stereo image, enhancing the track's spatial characteristics and creative appeal.

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FAQ

What audio file formats can I upload?

You can upload stereo audio files in common formats like MP3, WAV, FLAC, and more, up to 200MB in size.

Can I invert both channels at the same time?

Yes, you can choose to invert the left channel, right channel, or both channels simultaneously.

What is phase inversion typically used for?

Phase inversion is often used to cancel out vocals when audio is summed to mono or to create stereo widening effects.

Will this completely remove vocals from a track?

It can significantly reduce vocals when the track is later played in mono, but effectiveness depends on the original audio mix.

What output formats are available?

You can export in MP3, AAC, M4A, OGG, Opus, FLAC, or WAV formats to suit your needs.

API Documentation

Request Endpoint

POST /en/api/tools/audio-invert-phase

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
channel select No -
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-invert-phase to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-invert-phase": {
      "name": "audio-invert-phase",
      "description": "Invert the phase of one channel (for vocal removal effect)",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-invert-phase",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]