Got a recording that’s too quiet to hear properly, a phone video with barely-there audio, or an interview where the speaker was too far from the mic? This volume booster raises the level of any MP3 or WAV file by up to 20 dB, and it can automatically stop the loudest parts from clipping into distortion. Everything runs in your browser, so the file never leaves your device.

How to boost an audio file’s volume

Drop in a file and the boost controls appear. Drag the slider anywhere from 0 to +20 dB, or tap a quick preset (+3dB, +6dB, +9dB, +12dB, +15dB, +20dB) to jump straight to a common value. Two readouts under the slider, Original Peak and Resulting Peak, show you in dBFS how loud the file already is and how loud it will be after the boost, before you commit to anything.

Hit Preview to hear the boosted version. When it sounds right, pick MP3 or WAV under Export As and click Boost Volume & Download. The file you get matches exactly what you heard in the preview.

Preventing clipping and distortion

Cranking up the volume on a file that already has loud peaks is the fastest way to ruin it: once a sample goes past full scale, it gets clipped flat and turns into a harsh, crackly distortion that no amount of undoing will fix afterward. This tool handles that for you.

With Prevent Clipping turned on, the tool first measures the single loudest peak anywhere in the file, then automatically caps your requested boost so that peak lands right at the edge of full volume instead of past it. If your +12 dB request would have pushed the file into distortion, you’ll see a note like “Capped at +7.4 dB to avoid clipping”, and the Resulting Peak readout shows exactly where you landed. You still get the loudest possible result the file can safely take.

Turn the toggle off and the tool applies your requested boost exactly as set, even if that means the peaks slam into the ceiling and clip. That’s occasionally useful for a deliberately crunchy, aggressive effect, but for anything you want to sound clean, leave it on.

How much you can actually gain

A boost only makes a real difference if the original recording has headroom to spare. A voice memo recorded from across the room might sit at -30 dBFS or lower, so a +15 or +20 dB boost with Prevent Clipping on will bring it up close to a normal listening level without any harshness. A file that was already recorded close to 0 dBFS has nowhere left to go: the limiter will cap the boost down to almost nothing, and the Resulting Peak readout will tell you so honestly instead of pretending to help.

This makes the tool most useful for quiet phone recordings, distant-mic interviews, lecture capture, and old voice memos, rather than for commercially mastered music that’s already at full loudness.

Choosing MP3 or WAV for the export

MP3 keeps the file small and playable everywhere, which is the practical pick for voice memos, meeting recordings, and clips you want to share or archive. Match the bitrate to the source: 128 kbps is fine for speech, 192 kbps is a safe default, and 320 kbps is worth it if there’s music in the mix or you’re picky about quality.

WAV skips compression entirely and keeps every sample exactly as boosted. Choose it if you’re feeding the result into an editor or another processing step where you don’t want a second layer of lossy encoding stacked on top of the volume change.

Your file stays on your device

The peak measurement, the boost itself, and the re-encoding all happen locally using your browser’s Web Audio API. Nothing is uploaded to a server at any point, which matters if you’re boosting a private interview, a personal recording, or anything else you’d rather keep off the internet.

Because the processing runs on your own machine, longer files take a little more time to scan and process than short clips, but most voice memos and short recordings finish in a few seconds.

Need to change the playback speed instead? The Audio Speed Changer speeds up or slows down a file while keeping the pitch natural. If the file needs trimming first, the Audio Cutter lets you cut out just the section you need. And if the file is too large after boosting, run it through the Audio Compressor.