#72 · Browser Audio Tool

Podcast File Size Reducer

Make a smaller podcast copy by re-recording decoded audio into a lower-bitrate WebM file entirely in your browser.

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Local browser processing
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Choose an audio file to begin.
Audio is processed locally in your browser and is not uploaded.
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How to use Podcast File Size Reducer

  1. Upload a podcast episode the browser can decode.
  2. Choose a target bitrate and mono or stereo output.
  3. Run the reducer, compare sizes, and download the WebM copy.

What this audio tool does

The reducer decodes the episode and feeds it through a MediaStream destination into MediaRecorder at the requested bitrate.

Real-time WebM re-encoding trades some fidelity for a smaller spoken-word file; mono usually saves the most space.

Processing takes approximately the audio duration because MediaRecorder captures the playback stream in real time. Output is WebM audio.

Supported formats and limits

Input support follows the codecs available to your browser. WAV is used for generated PCM output, while recording tools use a supported WebM codec. Large or long files require more memory and processing time.

Example and practical tips

A voice-only episode can often use 48 kbps mono while remaining clear enough for casual listening.

  • Trim unused material before reducing the file.
  • Keep stereo only when spatial music or effects matter.

Frequently asked questions

Does podcast file size reducer upload my audio?

No. Processing happens in the current browser session. Files are not sent to Callaudio.

Which browsers work with podcast file size reducer?

A current desktop version of Chrome, Edge, Firefox, or Safari is recommended. Codec and recording support can still vary.

Can I preview the result before downloading it?

Yes. When the tool creates audio, the result player lets you compare it with the original before saving.

Why might an audio file fail to open?

The file may use a codec that your browser cannot decode, even if its filename extension looks familiar.

What happens when I select Reset?

Reset removes the current source, result, player URLs, waveform, and status values from the page.

Processing details

Real-time WebM re-encoding trades some fidelity for a smaller spoken-word file; mono usually saves the most space.

Processing takes approximately the audio duration because MediaRecorder captures the playback stream in real time. Output is WebM audio.

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