Does the pitch change when I speed it up?

No. The tempo filter keeps the original pitch, so voices and music stay natural at any speed.

What speed range is supported?

0.5× to 2×, which covers most practical slow-down and speed-up needs in a single, clean pass.

Change Audio Speed

Play audio faster or slower from 0.5× to 2× while keeping the pitch natural — ideal for lectures, podcasts, and practice tracks. Runs locally in your browser.

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Speed without the chipmunk effect

The tool uses ffmpeg's tempo filter, which changes playback speed while preserving pitch — so a sped-up voice still sounds natural, not squeaky.

When to use it

Speed up lectures and podcasts to save time, or slow down music and speech to transcribe or learn a passage note by note.

Privacy

The speed change is applied on your device with ffmpeg.wasm and the result is exported as MP3, with nothing uploaded.

How to change audio speed

Drop an audio file into the zone above.
Set the speed from 0.5× (slower) to 2× (faster).
Press Change speed, then download the MP3.

Related converters

Trim AudioCut a clip from any audio file with a preview player.Increase VolumeMake a quiet recording louder.Compress AudioShrink audio files by choosing a lower bitrate.