#78 · Browser Audio Tool

Audio Playback Rate Tester

Test a playback-rate change by rendering a new WAV whose speed and pitch both follow the selected rate.

Choose audio

Local browser processing
No audio selected
Choose an audio file to begin.
Audio is processed locally in your browser and is not uploaded.
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How to use Audio Playback Rate Tester

  1. Upload an audio file.
  2. Choose a playback rate between 0.25× and 4×.
  3. Render the test, compare it with the original, and download the WAV.

What this audio tool does

The tool resamples the source through OfflineAudioContext. Faster rates shorten and raise pitch; slower rates lengthen and lower pitch.

PlaybackRate changes source-frame consumption during offline rendering, producing a real new buffer at the tested rate.

This tester does not preserve pitch. Use a dedicated time-stretch algorithm when pitch must stay unchanged.

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

Render 1.25× to check whether a spoken recording remains understandable at a faster pace.

  • Try small steps such as 1.1× or 1.25× first.
  • Musical pitch shifts along with speed.

Frequently asked questions

Does audio playback rate tester upload my audio?

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

Which browsers work with audio playback rate tester?

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

PlaybackRate changes source-frame consumption during offline rendering, producing a real new buffer at the tested rate.

This tester does not preserve pitch. Use a dedicated time-stretch algorithm when pitch must stay unchanged.

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