#062 · Browser Audio Tool

Audio Time Stretch Tool

Lengthen or shorten audio while keeping pitch reasonably stable with browser-based overlap-add processing.

Choose audio to stretch

Pitch-preserving OLA
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 Time Stretch Tool

  1. Choose a compatible audio file.
  2. Set the available options for your task.
  3. Select Stretch audio and wait for the local operation to finish.
  4. Review the measurements or compare the preview, then download the audio or report.

What this audio tool does

Lengthen or shorten audio while keeping pitch reasonably stable with browser-based overlap-add processing.

A Hann-window overlap-add routine moves short grains farther apart or closer together while retaining their internal waveform rate, which keeps pitch more stable than simple playback-rate resampling.

Extreme settings can create a fluttery or reverberant sound. Speech and sustained tones usually work better than sharp percussion.

Supported formats and limits

Audio decoding follows the formats supported by your browser. WAV export uses 16-bit PCM. No file is uploaded.

InputBrowser-decodable audio
OutputPCM WAV or JSON analysis report
ProcessingLocal in this browser

Example and practical tips

For example, use Audio Time Stretch Tool on a short copy first, listen or inspect the result, and only then process a long recording.

  • Close other audio-heavy tabs for smoother processing.
  • Keep an untouched copy of the source.
  • Extreme settings can create a fluttery or reverberant sound. Speech and sustained tones usually work better than sharp percussion.

Frequently asked questions

Does the audio time stretch tool upload my audio?

No. Audio processing and analysis happen in your browser, so the selected file is not sent to a server.

Which browsers work with this Audio Time Stretch Tool?

A current browser with Web Audio API support works best. Input codec support still depends on the browser.

Can I preview the result before downloading?

Yes. When the tool creates audio, the original and result players let you compare them before saving.

Why is the exported file a WAV?

PCM WAV is widely supported and can be encoded reliably in the browser without an external server or codec.

Will this tool reduce audio quality?

Extreme settings can create a fluttery or reverberant sound. Speech and sustained tones usually work better than sharp percussion.

Processing details

ToolAudio Time Stretch Tool
CategorySpeed Pitch & Timing
PrivacyLocal browser processing

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