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Change Audio Speed

Speed up or slow down audio, keeping the voice natural.

Speed

Voices sound natural, just faster or slower.

More options

MP3, WAV, M4A, AAC, FLAC, OGG and Opus, many files at once

Drop more files anywhere on this page, or

    Runs on your device. No upload wait.

    What you get

    • 0.25× to 4×
    • Pitch kept

    Questions

    How does it keep the pitch?

    By time stretching: the audio is cut into short overlapping slices that are laid down closer together (or further apart) and matched so the joins don’t show. The pitch stays, only the pace changes. Very large changes, like 4×, bring some artefacts.

    What is “pitch follows speed”?

    Like playing a record or tape at the wrong speed: faster sounds higher, slower sounds deeper. Sped-up songs made this way are known as nightcore; slowed-down ones as “slowed”.

    Which speed for podcasts?

    1.25× to 1.5× is comfortable for most speech. Beyond 2× it takes practice to follow.

    Can I change the pitch without changing speed?

    Not with this tool yet.

    Are my audio files uploaded anywhere?

    No. Your audio files are opened and processed on your device, and the results are saved straight back to it. Nothing is uploaded. How to check.

    Is it free? Do I need an account?

    It is free to use and there is nothing to sign up for. There are no watermarks and no daily limits.

    Missing something, or not working as it should? Tell us