Make quiet audio properly loud. Drop in a file and Solmi shows you how much headroom it has, boosts it by as much as you want, and holds the peaks under a safe ceiling with a real limiter so louder does not turn into distorted. Runs entirely in your browser — no upload, no signup, and your audio never leaves your device.
Three tools get called a volume booster and they do different things. A plain gain boost multiplies the whole waveform; it is simple but clips as soon as a peak crosses the ceiling. A normalizer raises the track until its loudest peak just touches the ceiling, which is safe but often disappointing, because one loud snare hit limits how far a quiet recording can go. A limiter lets you push past that point by turning the gain down only for the instant a peak would overshoot, so the average level rises while the peaks stay clean. This booster combines the last two: Auto level is the normalizer, the slider is the boost, and the limiter runs on everything.
Start with Auto level to use up the track's headroom, listen, and only then add more. A few dB over Auto sounds louder and denser; ten or more starts to flatten the dynamics, which is the limiter working hard rather than a fault. If a recording is quiet because of room noise, boosting also raises the noise, so a noise-reduction pass in an editor before boosting gives a cleaner result. Export as WAV if you are going to edit further, MP3 if you are done.
| Source | Suggested boost | Why |
|---|---|---|
| Quiet voice memo or interview | Auto level, then +3 to +6 dB | Speech tolerates heavy limiting |
| Home demo or bounce | Auto level only | Keeps the mix's dynamics intact |
| Old MP3 rip that plays too quiet | Auto level, then +2 to +4 dB | Matches modern loudness without pumping |
| Field recording or live set | Auto level, then listen | Crowd peaks limit how far you can go |
Most online volume boosters upload the file to a server, queue it, and email you a link. This one decodes the audio in the browser with the Web Audio API, applies the gain and the limiter locally, and encodes the download on your device, so there is no upload wait, no file-size quota, and nothing stored anywhere. A two-hour recording is limited only by your device's memory. Once the level is right, the audio converter changes the format, the audio mastering tool takes a finished mix to release loudness, and the AI music video generator turns the track into a video.
Drop the file in and Solmi measures its peak and average level. Use Auto level to apply the largest boost the track can take without touching the ceiling, or set the amount yourself in dB and preview the result before downloading. Everything runs on your device.
Not the way a plain gain control would. Raising the level past the ceiling normally clips the waveform flat, which is what makes loud audio sound crunchy. This tool runs a limiter that pulls the gain down for the instant a peak would overshoot and releases it smoothly afterwards, so the loud parts stay clean. Very extreme boosts will still audibly squash the dynamics — that is the limiter working, not a bug.
Start with Auto level, which uses up the track's available headroom exactly and is always safe. Beyond that, a few dB more will sound louder and denser; past roughly 10 dB over Auto you are trading dynamics for loudness, and quiet passages will start to be pulled up along with everything else.
Usually the input gain was set too low when it was recorded, which leaves the whole waveform sitting far below the ceiling. Boosting raises the audio back up, but it also raises whatever noise was recorded with it — a hissy room or a bad mic will sound hissier once it is loud enough to hear.
MP3, WAV, M4A, AAC, OGG, and FLAC — anything your browser can decode. You can download the result as an MP3 or as an uncompressed 16-bit WAV.
Yes. Drop an MP3 in, boost it, and download it as an MP3 again (or as a WAV if you want to avoid a second round of compression). The same works for WAV, M4A, AAC, OGG, and FLAC sources; the booster decodes whatever the browser can play.
Open this page in your phone's browser, pick the file from your downloads or recordings, press Auto level, and save the result. Everything runs on the phone, so nothing is uploaded and it works on mobile data. If the recording is a video, extract the audio first with the video to MP3 converter.
This one is, because it is not really 'online' in the upload sense: the file is decoded, boosted, and re-encoded inside your browser, and nothing is sent to Solmi's servers. A voice memo, an interview, or an unreleased mix never leaves your device.
Yes, completely free with no signup and no watermark. Once your track is at the right level, you can turn it into a music video with Solmi's AI music video generator — also free to start.