Batch processing

Batch Audio Tools

Process multiple audio files in one workflow with browser-based tools built for production and post-production.

Files are processed one after another. Your audio files are processed locally in your browser.

Batch tools

• Batch Sample Rate ConverterConvert the sample rate of multiple audio files in one batch: 96 kHz location recordings to 48 kHz for picture, or 48 kHz to 44.1 kHz for music delivery.Batch convert sample rates →
• Batch Stereo to MonoSplit multiple stereo WAV files into separate Left and Right mono files. This is channel extraction, not a mono downmix: nothing is summed.Split stereo files →
• Batch WAV to MP3Convert multiple WAV files to high-quality MP3 files in one batch, for review links, reference copies and client previews.Batch convert WAV to MP3 →
• Batch WAV to AIFFConvert multiple WAV files to AIFF, keeping each file's sample rate and bit depth by default.Batch convert WAV to AIFF →

How batch processing works

1. 01. Add your files

   Select multiple compatible audio files for the tool you need.

2. 02. Choose your settings

   Set the options that tool offers once, for the whole queue.

3. 03. Process the batch

   Files are processed one after another and saved or downloaded as each one is ready.

Working through the queue one file at a time means only the current file is held in memory, rather than a whole batch of decoded audio.

Built for production workflows

• Preparing a shoot day's recordings for video editing and post-production
• Converting sample rates to match a delivery spec
• Creating MP3 reference files for review and approval
• Preparing AIFF versions for applications and delivery workflows that require them
• Splitting stereo recordings into separate Left and Right mono channels

Large batches

Files are processed one at a time and each finished file is saved as soon as it is ready, so there is no ZIP to wait for. In browsers that support it, you can choose an output folder once and every file is written there. Otherwise, each file is saved as a normal browser download.

Batch or single-file tool?

Frequently asked questions

What is batch audio processing?

Applying the same operation to a whole set of audio files instead of opening each one separately: for example converting every file of a shoot day to 48 kHz, or splitting a folder of stereo recordings into mono channels.

Can I process multiple audio files at once?

Yes. Add as many compatible files as you need to the queue. They are processed one after another, and each file is saved as soon as it is ready.

Are my audio files uploaded?

Your audio files are processed locally in your browser. Each file is read, processed and written locally, one after another.

Can I batch convert audio to 48 kHz?

Yes. The Batch Sample Rate Converter converts every file in the queue to the rate you choose, such as 48 kHz, 44.1 kHz or 96 kHz, and keeps supported timecode and production metadata in WAV output.

Can I split multiple stereo WAV files into mono files?

Yes. Batch Stereo to Mono turns each stereo WAV into a Left mono WAV and a Right mono WAV, copied sample for sample, with the original sample rate, bit depth and duration.

Can I batch convert WAV files to MP3?

Yes. Batch WAV to MP3 converts a whole set of WAV files to MP3. Files with more than two channels are refused, because MP3 can only hold mono or stereo.

Can I choose an output folder?

In browsers that support choosing a folder, such as recent versions of Chrome and Edge on desktop, you can pick an output folder once and each file is written there. In other browsers, each file is downloaded as soon as it is finished.

Which browsers support Batch Processing?

The batch tools run in current desktop browsers. Choosing an output folder is only available in browsers that support it; elsewhere files are saved as individual downloads. No ZIP is required either way.