Speed Changer

Speed up or slow down an audio file without opening a DAW. Preview the rate, then export a new file — all in your browser.

Drop an audio file here

or click to choose from your computer

MP3 · WAV · FLAC · AAC · M4A · OGG

✓ Local processing in your browser · Files are not uploaded to our servers

What is the Speed Changer?

The Speed Changer adjusts how fast a track plays. Use it to fit a voiceover into a time slot, slow a phrase for practice, or create a simple sped-up version for social clips.

You pick a rate (for example 0.75×, 1×, or 1.5×), listen to the result, and download a rendered file. Processing is designed to stay on your device.

Pitch may shift with speed when using classic rate change — that is expected for this simple tool. For nightcore-style presets, see Nightcore Maker; for reverb + slow, see Slowed + Reverb.

Presets make common rates one click away: half speed, 0.75×, original, 1.25×, 1.5×, and double speed. One-click vibes jump straight to Slowed, Slowed + Reverb, Nightcore, or Sped Up so you can preview a style before fine-tuning the slider.

The waveform and duration readout update as you change the rate, so you can see the new length before you export. Everything runs locally in the browser — your audio is not uploaded to Sound Booster servers.

How it works

Add a file

Drop an audio file into the tool or choose one from your computer. Supported formats include MP3, WAV, FLAC, AAC, M4A, and OGG when your browser can decode them.

Set the speed

Choose a playback rate such as 0.75× for a slower version, 1× for the original rate, or 1.5× for a faster version. You can use presets or fine-tune the control and preview the result.

Export

Export the processed track as a WAV file. The new duration is calculated from the selected rate, so you can see how much shorter or longer the result will be before downloading.

Speed Changer tips

Speed changes are useful for more than music. Slow down speech or a difficult passage when you are learning, reviewing an interview, practicing an instrument, or checking a detail in a recording. Faster playback can help shorten long recordings or create energetic versions for short-form content.

Remember that classic speed changes affect both playback time and pitch. A slower rate normally makes the sound lower, while a faster rate normally makes it higher. If you need to change pitch without changing the overall duration, use the Pitch Shifter instead.

For natural results, start with a moderate rate change and listen before exporting. Extreme values can make voices and instruments sound noticeably different from the original.

Frequently asked questions

Will pitch change too?

Yes with basic speed change — faster usually sounds higher, slower lower. Dedicated pitch tools separate those controls more carefully.

Is this free?

Yes. No account is required to change speed in the browser.

Do my files leave this device?

No. Core processing is designed to run locally in the browser. We do not upload your audio to Sound Booster for this tool.

Is this tool free?

Yes. No account is required to use it in the browser.

Related tools

Keep editing with other browser-based tools on Sound Booster.