Audio Channel Splitter — Free Online

There are times when you need to work with the left and right channels of a stereo recording as separate files. Audio forensics, karaoke extraction (where the centre-panned vocal is isolated by phase cancellation), mixing stem work, and quality control checking of individual channels all require splitting stereo into its constituent parts.

This tool takes a stereo audio file and outputs two separate mono files — one for the left channel and one for the right. Each file is exported at the original sample rate and bit depth. It is a simple but precise operation that would otherwise require a DAW or command-line FFmpeg knowledge to perform.

How to Split Stereo Audio into Left and Right Channels

1. 1

   Upload your stereo audio file

   Drop any MP3, WAV, FLAC, OGG, or AAC stereo file. Files up to 100 MB are supported.

2. 2

   Confirm the split

   FileCrank extracts the left and right channels into separate files automatically.

3. 3

   Download your channel files

   Click Split. Download the left channel and right channel as separate audio files. Files are deleted within 1 hour.

How Stereo Channel Splitting Works

A stereo audio file stores interleaved samples: left sample, right sample, left sample, right sample, alternating at the sample rate. Splitting the channels requires de-interleaving the sample stream and writing each channel's samples into a separate mono container. The tool uses FFmpeg's channelsplit filter running in WebAssembly to perform this operation.

The channelsplit filter routes each input channel to a separate output audio stream. These streams are then muxed into separate mono output files, each with identical sample rate, bit depth, and encoding settings to the original. The entire operation is performed without re-encoding if the output format matches the source, preserving full quality.

Why Use FileCrank to Split Audio Channels?

• ✓ Extracts left and right channels into separate mono files.
• ✓ Supports MP3, WAV, FLAC, OGG, and AAC input.
• ✓ Useful for multitrack editing and audio analysis.
• ✓ No watermarks, no signup, completely free.
• ✓ Files are processed securely and deleted within 1 hour.

Características y Especificaciones

Tamaño máx. de archivo

Hasta 100 MB

Privacidad

Archivos eliminados tras aproximadamente una hora

Precio

Gratis, sin registro

Procesamiento

En el servidor

Frequently Asked Questions

Channel Splitter vs Manual DAW Export

Splitting channels in a DAW requires soloing each channel separately and performing two export operations. Command-line FFmpeg can do it in one command, but the syntax is non-obvious. This tool wraps the operation in a simple interface and delivers both output files simultaneously, making it the fastest option for users who do not want to work in a terminal.

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