#046 · Browser Audio Tool

Change Speed Without Changing Pitch

Shorten or lengthen speech and music with an overlap-add time-stretch process that keeps the original pitch close to intact.

Choose audio and speed

Pitch-preserving stretch
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 Change Speed Without Changing Pitch

  1. Choose a compatible audio file.
  2. Set the controls for the job.
  3. Select Change speed, preview the result, then download it.

What this audio tool does

Change Speed Without Changing Pitch uses decoded PCM samples instead of merely renaming the source file. The result and measurements come from the audio selected in this page.

The page decodes audio to an AudioBuffer, performs the requested sample or signal analysis, and creates a fresh WAV Blob.

Pitch preservation uses browser-side overlap-add and is best for moderate speed changes.

Supported formats and limits

Input works when the browser can decode the file. Output support is checked before processing, and the tool never disguises one format as another.

StageDetails
InputBrowser-decodable audio
ProcessingLocal Web Audio
OutputNew audio Blob

Example and practical tips

Try a short, clean sample first. Listen to the transition or measurement, then repeat with the full file once the settings feel right.

  • Keep an untouched copy of the source.
  • Avoid clipping by leaving peak headroom.
  • Close unused tabs before processing long audio.

Frequently asked questions

Does change speed without changing pitch upload my audio?

No. Audio decoding, measurement, and output creation happen locally in the browser.

Which files can I use with change speed without changing pitch?

Use an audio format your browser can decode. WAV, MP3, OGG, M4A, and WebM support varies by browser and operating system.

Why can a browser reject a valid audio file?

The file may use a codec that the browser does not expose to Web Audio. Trying a current Chromium, Firefox, or Safari release may help.

Will the downloaded file match the source quality?

Processing creates a new file. PCM WAV output is uncompressed, while browser-encoded formats depend on the selected encoder and bitrate.

Can I use this on a phone?

Yes, if the mobile browser has enough memory and supports the input codec. Shorter files are more reliable on mobile devices.

Processing details

ItemValue
PrivacyLocal browser processing
PriorityB

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