Make a quiet recording louder, tame a loud one, or bring a batch of files to the same loudness. Choose a fixed change in dB, loudness normalization to a LUFS target, or peak normalization.
Change audio volume at a glance
| Price | Free, no sign-up, no watermark, no daily limit |
|---|---|
| Accepts | MP3 · M4A · WAV · FLAC · OGG |
| Largest file | 1 GB per file, several files at once |
| Where it runs | In your browser: files are never uploaded |
| Works on | Any modern browser on iPhone, Android, Windows, Mac and Linux |
| Send the result | Download it, or send it free with a link or by email (up to 20 GB) |
How to change audio volume
- Choose or drop one or more audio files.
- Pick a mode: change by dB, normalize loudness (LUFS), or normalize the peak.
- Set the amount or the target, and keep “Prevent clipping” on.
- Press Change volume, listen, then download or send the files.
Three modes, precisely
- Change by dB multiplies every sample by the same amount: +6 dB is about twice the amplitude, −6 dB half.
- Normalize loudness measures the integrated loudness of the whole file as defined by ITU-R BS.1770-4 (K-weighting, 400 ms blocks, the −70 LUFS absolute and −10 LU relative gates of EBU R128), then applies the one gain that brings it to your target. Choose −14 LUFS for YouTube, Spotify and most streaming, −16 LUFS for podcasts, −23 LUFS for EBU R128 broadcast.
- Normalize peak scales the file so its highest sample peak sits at the level you choose, for example −1 dBFS. It does not make files sound equally loud.
Louder without distortion
Raising the level can push peaks above 0 dBFS, which would clip. With “Prevent clipping” on, a look-ahead limiter lowers just those peaks smoothly so every sample stays at or below −1 dBFS (sample peak; inter-sample peaks are not measured). Very dynamic recordings may then land slightly below the loudness target; the result shows the measured loudness and peak of every file so you can check.
Batch and privacy
Add a whole album or a folder of voice notes: each file is measured and adjusted on its own, so they end up at the same loudness. The files are decoded and encoded in your browser and never uploaded. To shape the start and end instead, use Fade audio.
How this compares
| This tool | Online converters (e.g. Online Audio Converter, Clideo or CloudConvert) | Desktop apps (e.g. Audacity) | |
|---|---|---|---|
| Your file is uploaded | No | Yes, to their servers | No |
| Install or account | None | Account for some features | Install needed |
| Watermark or daily limits | None | Common on free plans | Depends on the app |
Plans of other services change; check their sites. More audio tools.
Frequently asked questions
What does −14 LUFS mean?
LUFS measures perceived loudness over the whole file. −14 LUFS is the level YouTube and Spotify play music at; louder files are turned down by those services anyway.
What is the difference between loudness and peak normalization?
Loudness normalization makes files sound equally loud. Peak normalization only moves the highest peak to a level, so a quiet speech file and a loud song still sound different.
How much louder can I make a file?
Up to +30 dB by hand. With “Prevent clipping”, strong boosts are limited so they do not distort, but noise in the recording gets louder too.
Is it true-peak?
No. The limiter and the peak readings use sample peaks. Keep the −1 dBFS ceiling for a little safety margin.
Are my files uploaded?
No. Everything happens on your device.
Need to send a big file?
Send files up to 20 GB with a download link or by email. Free, no account needed, original quality.
Send large files free