Make sound louder or even
Makes quiet sound louder, or makes several sound files sound equally loud. The loudest moments are held back automatically so that nothing clips. The files are processed only on this device.
- Free
- No upload
- No sign-up
- Works offline
How to use
Press "Choose files" and pick sound or video files (up to 20 for "Make even").
Choose "Make louder" or "Make even", set how much louder or the loudness to reach, then press "Make louder" or "Make even".
Press "Save" to save the new file (louder.mp3, leveled-1.mp3 and so on; several files as leveled.zip).
Questions
Are my files sent anywhere?
No. Reading the files and changing their loudness both happen on your device. Nothing is sent out after you choose a file.
Will it clip?
It is made not to. Wherever the loudest moment (the peak, measured also between the samples) would go above -1 dBTP, the sound is lowered smoothly from a little before it (a limiter), and the lowered sound is measured again. Saved as MP3, M4A or OGG, encoding can push it slightly above; the 1 dB of room is for that.
What is LUFS, and which one should I choose?
LUFS measure how loud sound is to our ears (ITU-R BS.1770-4, EBU R 128). As a guide: -14 for music and video sites, -16 for speech and podcasts, -23 for broadcast.
What happens if I make it much louder?
The loud moments are held back more often, so the sound may feel flatter than before. The result then says "loud moments held back".
Do song titles and other information stay?
No. The new files hold only the sound. Song titles, artists, album pictures and other information are not copied.
Can I use it on a phone?
Yes. It takes longer than on a computer, and a file can be up to 2 hours. Inside apps such as LINE, saving may not work. If so, open the page again in Safari or Chrome.
Limits
- "Make louder" takes one file at a time, from +1 to +20 dB. "Make even" takes up to 20 files.
- Loudness is measured with ITU-R BS.1770-4 (gated). Sound shorter than 0.4 seconds is measured as one whole. Files without sound cannot be made even.
- Peaks are held at -1 dBTP or below. For usual sound such as voice and music, parts that never come near -1 dBTP only change in volume. Where the sound comes near it, it is lowered smoothly from a little before, and very high sounds whose peaks between the samples cannot be measured well are taken out too (in a 44.1 kHz file, they are softened from about 19.8 kHz and removed above about 20.7 kHz; people hardly hear them). So the sound can end up a little quieter than the loudness chosen. In sound with much very high content, such as white noise or noise above about 18 kHz, these very high sounds can be taken out even where the peak stays well below -1 dBTP, and the sound is then quieter by that much (white noise leveled to -14 LUFS, for example, can end at about -14.3 LUFS). The result shows the loudness and the peak before and after. A sound that starts or ends abruptly while loud is faded in or out very briefly (about 4 ms at 44.1 kHz; the result says so). A very short sound (up to about 0.09 s at 44.1 kHz) is lowered as a whole.
- MP3, AAC, Opus and Vorbis are read with the browser's own features, so some browsers cannot read them (the tool says so when such a file is chosen). In browsers that can only read sound at once (Safari 18 and earlier on iPhone, for example) and for Vorbis, the limit is about 12 minutes on iPhone and iPad, about 24 minutes on Android and about 48 minutes on computers (in stereo at 44.1 kHz).
- A file can be up to 4 GB and 12 hours on computers, and up to 2 GB and 2 hours on phones and tablets. New files can be up to 500 MB on iPhone and iPad, 1 GB on Android, and 4 GB on computers and other devices (1 MB is 1,000,000 bytes).
- Saved as MP3, the sound starts after about 0.024 s of silence in some players (a matter of how MP3 works). For an exact length, or joins without a gap, choose WAV or FLAC.
- We cannot protect against things in your own environment, such as browser extensions.
- The work is done on this device, so how long it takes depends on how powerful the device is. On an older phone, it can take several times as long as on a computer.