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Audio speed changer

Speed up or slow down a song, podcast, or recording, from 0.5× to 2× or any speed, with the pitch kept or following along. It’s free, and the file never leaves your device.

Files stay on your device

Drop an audio file to change its speed

Speed up or slow down a song, podcast, or voice recording, with the pitch kept or following along. It’s saved in the same format.

MP3, M4A, WAV, FLAC, and other audio, or a video with sound.

How to speed up or slow down audio

Open an MP3, WAV, M4A, or other audio file, pick a speed or type your own, and press play to hear it. Keep pitch stretches the sound so voices and notes stay in tune, for practicing a song or getting through a lecture faster. Change pitch works like a tape, so faster sounds higher and slower sounds deeper. If you know the song’s BPM, enter it and the tempo you want, and the speed is worked out for you.

  1. Step 1

    Choose the audio
    A song, podcast, lecture, or voice recording.

  2. Step 2

    Pick the speed
    A preset, your own speed, or a new BPM, with the pitch kept or not.

  3. Step 3

    Download it
    Saved at the new speed, in its own format.

What to expect

Supported inputs
MP3, WAV, M4A, FLAC, Ogg, Opus, AAC, AIFF, and other audio this browser’s engine can read, and videos with sound.
What happens
The sound is encoded again at the new speed, in the file’s own format. A FLAC or AIFF is saved as a WAV, and a video’s picture is sped up or slowed down with its sound.
Limits
Speeds range from 0.1× to 100×. Far from 1×, a kept pitch starts to sound smeared, so music sounds best between 0.5× and 2×.

Private by design

Your video stays on your device

Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.

  • No upload
  • No signup
  • No watermark

Questions

Leave Keep pitch on and choose a speed below 1×, such as 0.75×. The song plays slower and stays in the same key.

Enter its BPM now and the BPM you want under Tempo. A 120 BPM song set to 128 plays at 1.067×. The tempo isn’t measured for you, so look up the song’s BPM first.

Yes. Choose Change pitch: 1.25× sounds higher and 0.75× deeper, like a tape played at the wrong speed.

Yes. There’s no sign-up, no watermark, and no limit on how long the file is, and it’s never uploaded.

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