Question 1

Does changing the speed affect the pitch?

Accepted Answer

No — by default the speed slider preserves the original pitch, using the same time-stretching technique professional audio software uses. If you also move the pitch slider, that shift is applied independently on top of the speed change.

Question 2

Does changing the pitch affect the speed?

Accepted Answer

No — the pitch slider shifts pitch in semitones while keeping the original playback duration, unless you've also changed the speed slider.

Question 3

What range of speed and pitch can I use?

Accepted Answer

Speed can be set from 0.25x (quarter speed) to 4x (four times faster). Pitch can be shifted from -12 to +12 semitones (one octave down to one octave up).

Question 4

Which audio formats are supported?

Accepted Answer

MP3, WAV, OGG, and M4A are all supported as input. The processed file is saved in the same format as the file you uploaded.

Question 5

Why does the first use take longer than expected?

Accepted Answer

The first time you use any audio/video tool on this site, your browser downloads a ~30MB audio/video-processing engine (ffmpeg compiled to WebAssembly), cached afterward for instant use across all audio/video tools.

Question 6

Is my audio file uploaded to a server?

Accepted Answer

No. All processing happens entirely in your browser using WebAssembly — your file never leaves your device.

Audio Speed & Pitch Changer

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Frequently Asked Questions

Does changing the speed affect the pitch?

Does changing the pitch affect the speed?

What range of speed and pitch can I use?

Which audio formats are supported?

Why does the first use take longer than expected?

Is my audio file uploaded to a server?

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