MP3 Volume Booster
Recording too quiet, or one song softer than the rest? Turn the volume up by as much as +500%, hear the result live and let the limiter stop the crackling. Or normalize the file to a standard loudness in one click.
- Up to +500%
- No distortion
- LUFS normalization
- 100% private
100% private — Everything is processed directly in your browser: your files, voice, and image are never sent to Chatzam's servers.
How do you increase the volume of an MP3?
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Add your file
Drag in your MP3, voice memo, WAV, M4A or video: its waveform appears.
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Set the volume
Raise the slider (in % or dB) or choose "Normalize". Press ▶ to hear the result; any parts that would clip show up in red.
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Download
Keep the original format or choose MP3, WAV, M4A, FLAC or M4R, then download.
Louder, but clean
From −100% to +500%
Double, triple or multiply the volume by six, or turn it down all the way to silence. The setting is also shown in decibels.
Anti-clipping limiter
When the sound goes over the maximum, the limiter rounds off the peaks instead of chopping them: no crackling, even at high volume.
Volume normalization
Set the perceived loudness to −14 LUFS (YouTube, Spotify), −16 LUFS (podcasts) or −23 LUFS (TV) so all your files sound equally loud.
Clipping indicator
The tool works out how much of the sound would clip with your setting and shows it in red on the waveform, before you export.
Why an MP3 distorts when you turn it up too much
A digital audio file can't go above a maximum level, called 0 dBFS. If a recording already reaches that ceiling in places, doubling it "squashes" the peaks: that's clipping, the harsh crackle that tires your ears. The tool's indicator tells you how much of the sound would be affected. The limiter, on by default, gently and very briefly lowers any peaks that would go over: the sound comes across much louder without crackling. For a very quiet voice, +100% to +300% often gives a good result; beyond that, the background noise gets louder too.
Percent or decibels: how to read the setting
+100% means twice the amplitude, or about +6 dB. +200% is three times as much (+9.5 dB) and +500%, the maximum, is six times as much (+15.6 dB). In the other direction, −50% halves the amplitude (−6 dB) and −100% makes the file silent. Our ears hear a sound as "twice as loud" at around +10 dB, so it takes roughly +200% for a recording to sound clearly louder.
Normalize: the same loudness for all your files
Normalization doesn't target a peak level but a perceived loudness, measured in LUFS according to the EBU R128 standard. YouTube, Spotify and most platforms bring tracks to around −14 LUFS; podcasts usually aim for −16 LUFS and TV for −23 LUFS. The tool measures your file's perceived loudness, shows the gain needed and uses FFmpeg's loudnorm filter with peaks capped at −1.5 dB. It's the right way to even out a playlist, a series of podcast episodes or voice messages recorded at different levels.
Voice memos, meetings, videos: other uses
The tool also accepts iPhone Voice Memos (M4A), WhatsApp voice messages (Opus), meeting recordings in WAV and the sound of MP4 or MOV videos, saved as an audio file. To keep the picture of a video while making it louder, use Increase Video Volume. If the recording has hiss or annoying background noise, run it through Remove Background Noise From Audio first, then turn up the volume.
Frequently Asked Questions
How do I increase the volume of an MP3 without distortion?
Leave the anti-clipping limiter ticked, raise the volume and listen to the preview. If the indicator still shows a lot of clipping, lower the setting a little: a heavily squashed sound ends up losing its detail.
How much can I boost an audio file?
Up to +500%, which is six times the original amplitude (about +15.6 dB). That's plenty for a quiet recording; any more and the background noise would become too noticeable.
What's the difference between boosting and normalizing?
Boosting applies the same gain, the one you choose, to the whole file. Normalizing measures the file's perceived loudness and automatically sets it to a target (−14, −16 or −23 LUFS): handy when several files need to sound equally loud.
Can I lower the volume too?
Yes: move the slider below 0%. −50% halves the amplitude (−6 dB) and −100% makes the file completely silent.
How do I make a WhatsApp voice message louder?
Save or share the voice message to get its file (Opus or OGG), add it here, raise the volume and download it as MP3 or M4A so it plays anywhere.
Are my files uploaded?
No. Processing happens in your browser with FFmpeg: your files stay on your device. Free, no sign-up.