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Change speed

Speed up or slow down audio without changing its pitch.

Runs in your browser. Your file is never uploaded.

Speed up or slow down audio without changing the pitch

Change Speed plays audio faster or slower, from 0.25× to 4×, while keeping the pitch the same, so voices don't sound like chipmunks when sped up or drag when slowed down.

Use it to get through a long lecture faster, slow a song down to learn it, or fit a voice-over to a set length.

Change speed in short

Choose an audio file, then pick a speed between 0.25× and 4×, then pick the format and download. It's free, there's no sign-up, and it runs in your browser, so the file never leaves your device.

How to use Change speed

  1. 1

    Choose an audio file

    MP3, WAV, M4A, OGG, FLAC and more.

  2. 2

    Pick a speed

    Anywhere from 0.25× to 4×. The new length is shown.

  3. 3

    Save

    Pick the format and download.

Good to know

  • The pitch stays the same, so voices don't sound squeaky or deep. To change pitch instead, use Change pitch.
  • The first time you use an audio or video tool, your browser downloads our 31 MB processing engine. It's kept for next time, so later runs start straight away.
  • This tool runs in your browser. Very large files depend on your device's memory.

Popular uses

  • Learning music

    Slow a song to 0.75× to hear the notes and play along.

  • Lectures and audiobooks

    Listen at 1.25× or 1.5× to save time.

  • Language practice

    Slow speech down to follow each word.

  • Fitting a length

    Make a voice-over a few seconds shorter or longer.

Why use ConvertFile

  • Pitch stays the same

    Speed and pitch are separate, so voices still sound like themselves.

  • Never uploaded

    Your audio is processed by your own browser and handed back as a download. It isn't sent to our servers, so there's nothing for anyone to see, keep or leak.

  • No watermark, no sign-up

    The file you download is yours as it is: no logo stamped on it and no account needed. It's free for files up to 500 MB.

  • Works on any computer or phone

    Windows, Mac, Linux, Chromebook, iPhone and Android, in Chrome, Edge, Firefox or Safari. Nothing to install, and the tool keeps working if your connection drops once it has loaded.

Supported formats

Opens
MP3WAVM4AAACOGGFLACOpusWMAAIFFMP4 and other videos (sound only)
Saves as
MP3WAVM4A (AAC)OGG (Vorbis)FLACOpus

Change speed: common questions

How do I speed up audio without changing the pitch?
Choose the file, pick a speed above 1× and save. The pitch is kept automatically.
Can I change the pitch instead?
Yes, with Change pitch, which shifts the key without changing the length.
Does it work on podcasts and audiobooks?
Yes, for files up to 500 MB. Saving as Opus or M4A keeps spoken-word files small.
Is Change speed free?
Yes. Change speed is free, works without an account and adds no watermark, for files up to 500 MB. Pro raises that to 2 GB.
Are my files uploaded to a server?
No. Change speed runs in your web browser, so the file is read on your own device and never sent to ConvertFile.
Does Change speed work on Mac, Windows, Android and iPhone?
Yes. It runs in any modern web browser, with nothing to install. Very large files work best on a desktop or laptop, because in-browser tools use your device's memory.

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