Change Audio Speed and Volume
There are many reasons to change how fast audio plays. Students slow down a fast lecture to take notes, language learners replay dialogue at three-quarter speed, podcast fans race through episodes at one and a half times, and musicians slow a solo down to hear every note. Volume matters just as often: a voice memo recorded too quietly is hard to hear, while a loud file can distort. This free tool adjusts both speed and volume and saves the result as a new audio file.
The speed slider runs from a quarter speed up to three times speed, with preset buttons for the most common choices. The volume slider goes from silence up to double volume, which rescues quiet recordings, though pushing already loud audio higher can cause harsh clipping distortion, so use big boosts carefully. Press Play Preview to hear your settings immediately; the preview and the export use the same settings, so what you hear is what you get. The export itself renders the whole file with your choices applied and downloads it as WAV, which preserves full quality.
One honest warning, repeated above the tool: in a browser, changing speed also changes pitch. Faster voices sound higher, slower voices sound deeper, because the browser cannot separate speed from pitch the way specialised studio software can. For speech, practice, and podcasts this is usually acceptable, and many people even prefer it.
Everything happens inside your browser. Your file is decoded on your own device and is never uploaded to a server, so interviews, lessons, and unreleased tracks remain private.
How to use
- Click the file box and choose the audio file you want to adjust.
- Drag the Speed slider, or tap a preset like 1.5× for podcasts.
- Drag the Volume slider up for quiet recordings or down for loud ones.
- Press Play Preview and listen to check the result.
- Fine-tune the sliders while listening if needed.
- Click Export WAV to render and download the finished file.
Frequently asked questions
Why does the voice sound higher or deeper after changing speed?
Speed and pitch are linked when audio is simply played faster or slower. Browsers do not offer pitch-preserving time stretch, so a faster voice sounds higher and a slower one deeper. Dedicated audio editors can reduce this effect, but it cannot be done inside a web page.
Is my audio uploaded to a server?
No. Decoding, preview, and export all run locally in your browser. Your file never leaves your device.
Why is the export a WAV file?
Browsers can create WAV files directly but cannot encode MP3 on their own. WAV keeps the audio at full quality; you can convert it to MP3 later with any converter if you need a smaller file.
What happens if I set the volume to 200 percent?
Quiet recordings become much easier to hear, but parts that were already loud may clip and sound distorted. Preview first, and if you hear harshness, lower the boost until it sounds clean.