Change audio speed

FreeNo uploadNo signupWorks offline

Slow down a song to learn it, speed up a lecture or podcast, or make a slowed or sped-up version. Keep the pitch the same, or let it rise and fall with the speed like a record.

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How to use Change Audio Speed

Change Audio Speed – Speed up or slow down audio, with or without changing pitch. Free, no upload.

Choose or drop your files.
Pick the speed and whether to keep the pitch.
Click Change speed.
Play the result and download.

Supported formats

Input: MP3, WAV, M4A, FLAC, OGG, Opus, MP4, MOV, WebM
Output: MP3, WAV

Keep pitch or not

With “Keep the pitch” on, the audio is time-stretched with the WSOLA method: voices and instruments stay at their normal pitch. With it off, the audio is resampled like a tape played faster or slower – the classic “nightcore” or “slowed” sound.

Limitations

Up to 60 minutes and 500 MB per file.
Which input formats open depends on your browser: Chrome and Edge read the most formats.
Extreme speed changes with pitch kept can sound slightly phasey.

Privacy

Files you choose are read into your browser’s memory and processed on your device; they are not uploaded to a server. Temporary download links are released after use, and the offline cache never stores your documents. More about privacy and limits.

Frequently asked questions

How do I change speed without changing pitch?

Leave “Keep the pitch” switched on (the default).

Which speeds work best?

0.75× to 1.5× sounds natural with pitch kept. Extreme changes (0.5× or 2×) can sound slightly phasey.

Are my files uploaded?

No. The audio is decoded and processed in your browser, so recordings and videos never leave your device.

Is it free?

Yes – free with no signup, no watermark and no daily limit.