Audio Volume & Speed Changer
Boost or lower audio volume, normalise loudness and speed up or slow down audio with or without changing pitch.
About Audio Volume & Speed Changer
This tool lets you increase MP3 volume online when a recording is too quiet, or lower it when it is too loud. Set the gain in decibels, or tick Normalise to make the audio as loud as possible without clipping. It is a quick fix for lectures, voice notes and songs recorded at low levels.
You can also change the speed, for example 1.25× to get through a long lecture faster or 0.75× to learn a song, and choose whether to keep the original pitch. Download the result as MP3 or WAV. Audio is processed in your browser and never uploaded, and it is free with no sign-up.
How to use Audio Volume & Speed Changer
- Drop an audio file (or try the sample clip).
- Set the gain in dB or tick Normalise to make it as loud as possible without clipping.
- Set a speed and choose whether to keep the original pitch.
- Click Apply and download MP3 or WAV.
Frequently asked questions
What does Normalise do?
It scales the whole file so the loudest peak sits at −1 dBFS: as loud as possible without distortion.
What is "Keep pitch"?
With it on, the tool time-stretches the audio (WSOLA) so voices sound natural at 1.5× or 0.75×. With it off, speed and pitch change together like a tape.
Why does a +10 dB boost sound distorted?
If the peaks go above 0 dBFS they are clipped. Use Normalise, or lower the gain until the output peak is below 0 dBFS.
How do I increase the volume of an MP3 file?
Drop the file, raise the gain by a few dB or tick Normalise, click Apply and download. Very large boosts can cause distortion.
Can I slow down audio without changing the pitch?
Yes. Set a speed below 1× and tick Keep original pitch, so voices and music sound natural, just slower.
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