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Change Audio Speed

Speed up a lecture or slow down a solo from 0.5× to 2×. Voices keep their natural pitch.

Browser-first · upload only when a format needs it
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How it works

  1. 01

    Choose a file for Change Audio Speed. It accepts MP4, MOV, WEBM, MKV, MP3, WAV, FLAC, OGG, M4A. Most files stay in this tab.

  2. 02

    Set the options on the workbench — preview, crop or timeline when this tool has one — then press Run.

  3. 03

    Download the result. It is also saved in your tray so the next tool can pick it up without another upload.

About this tool

Choose a factor and export. Unlike simply playing faster, this uses a time-stretch algorithm (Signalsmith Stretch) that changes tempo while keeping pitch, so 1.5× speech still sounds like the same person and a slowed-down riff stays in tune. Everything runs in your browser; a ten-minute file takes a few seconds.

Questions

What can I open in Change Audio Speed?
Change Audio Speed accepts MP4, MOV, WEBM, MKV, MP3, WAV, FLAC, OGG, M4A. Older video containers such as AVI, WMV, FLV, MPEG and 3GP are decoded by the server encoder.
Does Change Audio Speed upload my file?
Most MP4, WebM, images and PDF stay in this tab. Instagram/TikTok crops, DVD, GIF, iPhone presets, stabilize, hard containers (AVI, WMV, HEVC) and a failed local encode go to the server encoder. The file is processed and discarded — we do not keep a copy.
How large can the file be?
Free: 500 MB and 8 exports a day. Plus (waitlist) raises the daily cap. A pasted public file URL is also accepted.

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