No upload, 100% local, no account

Audio volume

Boost or reduce the volume by a dB gain, or normalize to a consistent loudness. Everything runs in your browser, your file never leaves your device.

How Audio volume works

Audio volume lets you make a track louder or quieter by a precise decibel gain, or normalize it so its loudness matches a broadcast standard (EBU R128). Use the gain mode to boost a too-quiet voice memo or tame a clipping recording; use normalize to even out a playlist or podcast so nothing is jarringly loud or faint.

It runs through ffmpeg compiled to WebAssembly, with gain applied as a straight dB shift and normalize targeting the EBU R128 loudness standard. No account, no watermark.

Frequently asked questions

Are my files uploaded to a server?

No. ffmpeg compiled to WebAssembly adjusts the loudness in this browser tab, your file is read into memory on your own device and processed there with the volume filter (a dB gain) or loudnorm (EBU R128 normalisation), and the result is offered as a local download. Nothing reaches Sunasty or any third party. Open your browser's DevTools, go to the Network tab and watch: no request carries your audio.

What is the difference between gain and normalize?

Gain applies a fixed change you choose, in decibels, e.g. +6 dB roughly doubles the perceived level, -6 dB roughly halves it. Normalize runs a single-pass ffmpeg loudnorm toward the EBU R128 target loudness, approximate (not the precise 2-pass measurement broadcasters use), but better than gain when you want several files to sound roughly equally loud.

Can boosting the volume distort my audio?

Yes, pushing a loud file higher can clip and distort. If you only need to even things out, prefer normalize, which targets a sensible loudness without crude over-amplification.

Does it keep my original format?

Yes. The output uses the same format as your input (MP3 stays MP3, WAV stays WAV, and so on).

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.