Volume Booster: Make Audio Louder
A volume booster for audio files: make an MP3, WAV, M4A or FLAC louder by up to 20 dB, or quieter by the same amount, right in your browser. A true-peak limiter catches the loudest moments before they clip, so a quiet recording gets louder without the crackle a plain gain boost causes. Batches work, and nothing is uploaded.
- Runs on your device
- Web Audio
- WebCodecs · GPU
- Works offline
Updated
Drop your audio files here
How to make audio louder
Step 1: Drop one or more audio files on the box above.
Step 2: Drag Volume change to the right. Start at +6 dB, try +10 dB for clearly louder, and use negative values to turn a file down.
Step 3: Keep Prevent clipping on so peaks are limited instead of distorted.
Step 4: Press Apply, listen to the result and download it. The result card says whether the limiter had to catch any peaks, and by how many dB.
Good to know
Settings explained
- Volume change
- +6 dB doubles the signal level; about +10 dB sounds twice as loud. Negative values make it quieter.
- Prevent clipping
- A true-peak limiter keeps boosted peaks from distorting.
Formats
Batch-friendly: add many files and they are processed one after another — if one fails, the rest still finish.
How it runs
- Web Audio
- Audio is processed with the browser’s built-in Web Audio engine, sample-accurate and fast.
- Hardware video engine
- Video is decoded and encoded by your device’s media hardware through WebCodecs — usually several times faster than real time.
How much louder is +6 dB?
Decibels are logarithmic. +6 dB doubles the signal level, but our ears need about +10 dB before something sounds twice as loud. For a quiet voice recording, +6 to +10 dB is usually right; +15 to +20 dB is for audio recorded far too low, and it will raise background hiss by the same amount.
| Volume change | Signal level | How it sounds |
|---|---|---|
| +3 dB | × 1.41 | Just noticeably louder |
| +6 dB (default) | × 2.0 | Clearly louder |
| +10 dB | × 3.16 | About twice as loud |
| +20 dB (maximum) | × 10 | About four times as loud; noise rises too |
| −6 dB | × 0.5 | Clearly quieter |
| −20 dB (minimum) | × 0.1 | Background level |
How to make an MP3 louder without distortion
Digital audio has a ceiling, 0 dBFS. Raise the volume of a file whose loudest moments already sit near that ceiling and those peaks are chopped flat, which you hear as crackle or fuzz. That is why simple gain tools sound harsh above a few dB.
With Prevent clipping on, ProMedia runs a look-ahead true-peak limiter set to −1 dBTP after the boost. It looks 5 ms ahead, briefly turns down just the moments around each peak that would cross the ceiling (recovering over about 80 ms) and leaves the rest of the file at the new, louder level. The result card reports the largest reduction it made, and the measured loudness (LUFS) and true peak of the result, so you can see whether you pushed too far.
Boost, normalize, equalize or compress: which one you need
Four tools change how loud audio feels, and they solve different problems. Pick by what is wrong with the file.
| Problem | Best tool | What it does |
|---|---|---|
| One file is simply too quiet (or too loud) | Volume booster (this page) | Adds the same gain to everything, limiter on peaks |
| Several files play at different levels | Normalize audio | Measures loudness and brings every file to one LUFS target |
| Thin sound, voices lost in music | Bass booster and equalizer | Raises or cuts specific frequency bands |
| File is too big to send | Compress audio | Lowers the bitrate; it does not change loudness |
| The soundtrack of a video is too quiet | Increase video volume | Same gain and limiter, video picture copied untouched |
Does boosting volume lose quality?
The gain itself is simple multiplication, and with the limiter on, peaks are turned down instead of being clipped flat. Two things can still cost quality. First, saving as Same as input for an MP3 or M4A means encoding again, at a bitrate close to the original and never below 128 kbps; choose WAV or FLAC under Save as for a lossless result. Second, boosting raises everything equally, including hiss, hum and room noise.
If the noise becomes obvious, clean the recording first with the noise reducer and boost afterwards.
Why use this volume booster
- Limiter included. Peaks are caught at −1 dBTP instead of clipping, so a boost stays clean.
- Numbers, not guesswork. Every result shows the change in dB, the loudness in LUFS and the true peak.
- Batch and private. Boost a folder of voice notes or lectures in one go; the files never leave your device.
- Up or down. The same slider lowers loud files by up to 20 dB, with no limiter needed.
Make audio louder on iPhone, Android or a computer
The booster runs in Safari, Chrome, Edge and Firefox. On every device you drop the file, set the slider and download.
iPhone
Open this page in Safari, tap the drop zone and choose the recording in Files. iOS has no built-in way to make a file louder; the phone’s volume buttons only change playback.
Android
In Chrome, tap the drop zone and pick the file from your recorder folder or Downloads. The louder copy is saved next to your other downloads.
Windows and Mac
Drag files in from File Explorer or Finder. System volume and media-player enhancements only affect your own playback; boosting the file makes it louder for everyone you send it to.
Tips & troubleshooting
Raise a quiet voice memo by +10 dB, listen, then decide whether you need more; the limiter result tells you when peaks start getting squeezed.
If the limiter reports several dB of reduction, the file is already as loud as it can cleanly get. Use normalize audio with a −14 LUFS target instead for a more even result.
Turn Prevent clipping off only for test signals or when you want hard clipping as an effect.
Need a slightly bigger file to stay lossless? Save as FLAC: it keeps every sample and is about half the size of WAV.
Boosting a song that already sounds loud? Raise the bass with the bass booster instead; more gain on a mastered track mostly feeds the limiter.
Volume Booster FAQ
How do I make an MP3 louder without distortion?
Drop the MP3 here, set Volume change to +6 to +10 dB and keep Prevent clipping on, then press Apply. The limiter holds peaks under −1 dBTP so they do not crackle, while the rest of the song gets louder.
How do I increase audio volume without losing quality?
Keep the limiter on and choose WAV or FLAC under Save as. The boost itself is lossless; only a lossy re-encode (MP3 or M4A) adds a small loss. Remember that background noise gets louder along with the voice.
Why does boosted audio crackle?
Because the peaks were pushed past 0 dBFS, the digital ceiling, and got cut off flat. That clipping sounds like crackle or fuzz. A limiter lowers just those peaks before they reach the ceiling.
Should I normalize or boost?
Boost when one file is too quiet and you know roughly how much louder it should be. Normalize when you want a specific loudness (such as −14 or −16 LUFS) or several files at the same level.
How do I make a video louder?
Use increase video volume. It applies the same gain and limiter to the soundtrack and copies the picture without re-encoding it. This page saves audio files only.
Can I lower the volume of an MP3 too?
Yes. Drag Volume change below zero, down to −20 dB, and press Apply. Turning a file down never clips, so the limiter is not needed. It is handy for sound effects or a music bed that is too loud under a voice-over.
Can boosting volume damage speakers?
The file cannot, but playing a much louder or clipped file at a high volume setting can push small speakers past what they handle. The limiter avoids the harsh clipping that is hardest on tweeters; still turn the volume down if you hear distortion.