Make a quiet recording louder with the ceiling shown before you start: your file is measured first, and the clean boost available is printed in plain words.
Your files are processed in your browser, on your own device. Nothing is uploaded to a server.
Some recordings simply play too quietly: the voice memo from across the room, the interview with a shy guest, the podcast recorded at the wrong gain. This tool makes audio louder in your browser, and it starts the way no slider-first booster does: by measuring your file and telling you how much clean boost is actually available.
That measurement is the product. Add a file and the tool reads its peak and average levels, then prints the headroom in plain words: this file peaks at -9.2 dB, so about 8 dB of clean boost is available before the loudest moment hits the ceiling. Every competitor hands you a slider and lets you find the clipping point by ear. Here the ceiling is marked before you push against it.
1. Drop the file into the box and read the measurement line.
2. Set the boost in decibels or percent (the two controls move together, and +3, +6, +9, +12 dB chips are one click), and decide on the limiter.
3. Press Apply the Volume, then check the boosted preview at a modest volume before you download.
Decibels are the honest unit: plus 6 dB roughly doubles the loudness you hear, and 200 percent means the same thing on the slider. Quieten is in scope too, down through unity to silence, because some files arrive too hot. The ceiling is physics: a sample cannot exceed 0 dBFS, and gain past it does not get louder, it gets damaged, flat-topped and harsh. The safety limiter, on by default when it matters, catches moments that would overshoot and holds them at the ceiling. The result line reports the before-and-after measurements so you can see what it did. Turn it off and the page warns in plain words that peaks will clip and distort.
The engine note: measurement and processing run on the encoder inside your browser, about 31 MB downloaded once and cached, and your audio never leaves the device.
Boosting raises the noise floor with the voice: hiss that was always inside a quiet recording becomes audible, proportionally. That is not the tool adding noise, it is the recording being turned up honestly, and no booster can separate the two after the fact. Work from the original file, never boost a boosted copy, and know that a clipped file cannot be repaired by any amount of later care. Making files match each other or a platform target is a different job: normalize audio. The full family is in the audio tools collection.
The classic file is a two-person interview where one guest is 10 dB under the other. This page fixes the whole file’s level, not the balance inside it, and it says so. When the quiet guest is the whole file (their solo track, their voice notes), a measured 9 or 10 dB with the limiter watching the peaks is exactly the repair. When both voices share one track at different levels, that is editing work, and no single gain number solves it.
Up to your headroom: the distance between your file’s peak and 0 dBFS, which the tool measures and prints. Past it, peaks clip unless the limiter catches them, and clipped sound is damaged sound.
Usually distance and gain: the mic was far from the speaker, or the recorder’s level was set low. Boosting fixes the level. It cannot recover the detail a distant mic never captured, and it raises the room noise along with the voice.
It reveals the noise already there. Hiss, hum and room tone rise by exactly the same decibels as the voice. A 12 dB boost on a quiet room recording makes its hiss plainly audible.
It watches for moments that would pass the ceiling and holds just those moments back, so the rest of the file gets its full boost without flat-topped distortion. The after-measurement on the result shows its work.
That is normalization, not gain: the Normalize Audio page measures perceived loudness in LUFS and matches files to a target like the podcast or streaming presets.
Yes. Negative decibels and percentages under 100 do exactly that, down to silence.
Same rules as this one: free, in your browser, with nothing uploaded.
MP3, WAV, M4A and OGG, swapped in seconds.
Cut a ringtone or a clip out of any song.
Heavy WAV files made small enough to share.
Voice memos and iTunes files as plain MP3s.
An MP3 opened back up into a full WAV file.
OGG files, often from games and apps, as MP3s.
Big FLAC songs made small enough for a phone.
An MP3 saved as OGG for games, apps and the web.