Raise a quiet recording as far as it will go before anything starts to distort
Processed in your browser. Nothing is uploaded. Updated on 24 Oct 2026.Quiet recordings are the commonest audio complaint there is, and most of them can be fixed exactly. The page measures the loudest moment in your file and works out how many decibels fit above it, then raises everything by that much and no more. Nothing distorts, because nothing is pushed past the ceiling. If you want more than that, the page says how much of the file would be flattened to get it.
Drop the quiet recording onto the page.
Change is already on Set the peak with Peak at -1 dB, so the loudest moment is raised to just below full scale.
The badge shows how many decibels that adds, and the page counts any samples it would flatten.
Press Make it louder, play the result to check it, and press Download.
Add a file and the page measures it before offering to change anything: the loudest single sample, the average level, and how many decibels fit above the loudest moment. Then choose either a change in decibels or a target for the peak, and the whole file is multiplied by that one figure.
Most volume boosters do exactly that and say nothing. Here the number of samples that would be flattened is counted, exactly, before anything runs. A few dozen out of five million is inaudible and the page says so. Ten per cent of the file is ruined audio and the page says that too, along with the largest change this particular file takes cleanly.
The peak decides what clips. The average, measured as RMS, is much closer to what people mean by loud: a heavily compressed pop track and a quiet spoken recording can share the same peak and be twenty decibels apart in the way they sound. Both figures are shown, in dBFS, where zero is full scale and every real signal is negative.
The rest of the article, and all 7 questions about Volume Changer, are on the Volume Changer page.
Choose the peak mode and leave the target at minus one decibel. Every sample is multiplied by the one figure that puts the loudest moment of your recording exactly there, which is the most the file can take with nothing flattened. The page shows how many decibels that turned out to be.
Up to a point. Raising the level raises everything equally, including hiss, hum and room noise, so a recording made at a very low level comes back louder but no cleaner. Nothing in a volume control can separate the wanted sound from the noise underneath it, and the page says so when a file is very quiet.
Nothing is re-compressed. The browser decodes the file once, every sample is multiplied, and the result is written as an uncompressed WAV, so no second generation of MP3 compression happens. The cost is size: a WAV is roughly ten times an MP3 of the same length.
No upload takes place. Decoding, measuring and multiplying all happen in your own browser, and the finished file is written on your device. No account is needed, no watermark is added to the audio, and the page keeps working with the connection switched off.
Still stuck? Ask about Volume Changer and anybody who knows can answer. No account needed.
Same job, other tools: Frequency Generator – Generate a steady test frequency for speakers, headphones or instruments · Sweep Tone Generator – Sweep smoothly between two frequencies over a time you choose · Audio Sweep Generator – Play a slow logarithmic sweep and hear every rattle in the room.
On the related tools: Mic Test – See your voice on a live waveform and hear it played straight back.
In the collections Audio Tools · Video Tools.