Podcasters
Bring every episode to -16 LUFS so listeners never reach for the volume, then get the words written out with our audio to text converter.
Volume Booster: Make Audio Louder Without Clipping
Drop in a quiet recording and this free volume booster measures its loudness in LUFS, then raises the level with a limiter that keeps every peak under the ceiling, or normalizes audio to the target your platform expects. Compare before and after, then download WAV or MP3. Everything runs in your browser.
Free, No Sign-inFiles Stay on Your DeviceBatch NormalizeDownload WAV or MP3
Upload audio to boost or normalize its volume
Supported formats: MP3, WAV, M4A, FLAC, OGG, AAC, MP4, MOV, up to 200 MB and 15 minutes per file, 20 files at once
or drag and drop audio or video files here
- Runs in your browser, nothing is uploaded
- LUFS and true-peak meter
- WAV or MP3, one file or a whole batch
More Tools
Why Use a Volume Booster for Quiet Audio
A recording that plays too quietly loses its audience in the first ten seconds. Turning up the speaker only helps you, and pushing the level in a basic editor makes the loudest moments crackle. A volume booster raises the whole file evenly and catches the peaks before they clip, so the next person hears it at a comfortable level too. Measure first, then boost: a reading in LUFS tells you how far a file is from where it should be, and the change you make is exact instead of a guess.
- Phone and laptop microphones record speech far below the level people expect.
- Simple gain controls push the loudest words into harsh, crackling clipping.
- Episodes, voice notes and songs recorded on different days all play at different levels.
- Streaming apps turn loud uploads down and leave quiet ones sounding weak.
- Hitting -16 LUFS for a podcast host means guessing without a loudness meter.
What This Volume Booster and Audio Normalizer Does
Measure, raise and match the loudness of any recording in one place.
LUFS and True Peak Meter
See integrated loudness, true peak, peak and RMS for every file before you change anything.
Boost Without Clipping
Add up to +30 dB of gain while a look-ahead limiter holds the peaks under your ceiling.
Normalize to a Target
Pick -14 LUFS for streaming, -16 for podcasts, -23 for broadcast, -9 for club mixes or any target from -30 to -6.
Live Before and After
Flip between the original and the boosted version while it plays, with both waveforms on screen.
Batch Normalize
Add up to 20 files and bring them all to the same loudness, then download one ZIP.
Private and Free
Your audio is processed on your own device. There is no upload, no account and no watermark.
How to Make Audio Louder in Three Steps
From a quiet file to a clean, loud one in under a minute.
- 1
Add your audio
Drop MP3, WAV, M4A, FLAC or OGG audio, or a video file, into the box above. Add several files at once if you want them to match. The loudness meter reads each one in a few seconds.
- 2
Boost or normalize
Raise the gain by ear, or choose a loudness target to normalize audio volume and the gain is worked out for you. Set a true peak ceiling and the limiter keeps the loudest moments under it.
- 3
Compare and download
Play the before and after versions side by side, check the new LUFS reading, then download WAV or MP3, one file at a time or all together.
Features of the EzTranscriber Volume Booster
Built for podcasters, video editors, musicians and anyone with a quiet recording.
A Free LUFS Meter and Loudness Analyzer
Loudness is not the same as peak level. Two files can both peak at -1 dB while one sounds twice as loud, so the tool measures loudness the way streaming services and broadcasters do: integrated LUFS following EBU R128 and ITU-R BS.1770, with true peak, sample peak, RMS, maximum short-term loudness and loudness range beside it. Use it as an online loudness meter, a LUFS checker before you publish or a quick LUFS test for a mix, then act on the reading in the same window. It works as a loudness penalty analyzer too: if your track sits far above -14 LUFS, you know a streaming app will turn it down.
Measure My LoudnessNormalize Audio to the Right Target
Choose where the file is going and the gain is set for you: about -14 LUFS for most streaming and video platforms, -16 LUFS for podcasts and spoken word, -23 LUFS for the EBU R128 -23 LUFS broadcast standard, -9 LUFS for loud club mixes and DJ sets, or any custom value. A true peak ceiling of -1 dBTP leaves headroom for MP3 encoding, with -2 and -0.1 dBTP one click away. Volume normalization goes by many names, normalizing volume, normalizing audio or, in British English, normalise audio and normalise volume, but here it is one click, and it works as a sound normalizer for voice and music alike.
Normalize Audio OnlineMake Audio Louder Without Clipping
Pushing a simple gain slider flattens the loudest words into harsh clipping. This volume booster puts a look-ahead limiter after the gain, so it can make audio louder while the peaks are eased down a few milliseconds before they would clip. Quiet interviews, lecture recordings and phone voice notes become easy to hear without the crackle, and the waveform shows exactly how much the limiter worked. It is the quickest way to make audio louder online, and it doubles as a music amplifier online for a soft demo or rehearsal take.
Make It LouderNormalize Audio Files in a Batch
A playlist, a season of episodes or a set of voice prompts should all play at the same level. Add up to 20 files, pick one target and the volume normalizer brings them all into line, then download them together as one ZIP. Use it to normalize sound across a playlist, or as a quick audio normalize pass before you publish. It is an MP3 normalizer, a WAV normalizer and a loudness normalizer in one, with no audio normalization software to install, which makes it an easy way to normalize audio files free of charge on any computer.
Normalize a BatchLoudness Calculator: How Much Can You Boost?
Set the loudness and peak of your file and pick a target to see the gain, the new peak and whether the limiter needs to step in. Then hear a quiet clip before and after.
Loudness calculator
Gain, new peak and limiting for any target
Target
Ceiling
Gain needed
+14.0 dB
to -16 LUFS
Peak after gain
+2.0
dBTP before limiting
Limiter
-3.0 dB
ceiling -1 dBTP
Final peak
-1.0
dBTP, never above the ceiling
-40-200 LUFS
The limiter trims 3.0 dB off the loudest peaks. Usually inaudible.
Drop your own file into the volume booster above and its loudness and true peak are measured for you.
Gain is simply the target minus the measured loudness: a voice note at -30 LUFS needs +14 dB to reach -16 LUFS. If its true peak sits at -12 dBTP, that gain would push the peak to +2 dBTP, so the limiter takes about 3 dB off the loudest moments to keep them under -1 dBTP. That is exactly the sum the tool above does for you, file by file.
Which LUFS Target for Which Destination
Typical loudness targets to normalize audio for the place it will be played.
| Which LUFS Target for Which Destination | Target | True peak | Tip |
|---|---|---|---|
| Spotify and YouTube | About -14 LUFS | -1 dBTP | Louder masters are simply turned down |
| Podcasts and Apple Music | -16 LUFS | -1 dBTP | Normalize every episode to the same target |
| TV and radio broadcast | -23 LUFS (EBU R128) | -1 dBTP | Check the delivery spec of your channel |
| Voice notes and social clips | -14 to -16 LUFS | -1 dBTP | Phones play quietly, so lean louder |
| Lectures and meetings | -16 to -19 LUFS | -2 dBTP | Even out quiet and loud speakers first |
| Music for mixing | Leave as is | -1 dBTP | Normalize only after the final master |
Who Uses a Volume Booster
Anyone whose recording is too quiet, too uneven or headed for a platform with a loudness target.
Video Editors
Lift quiet dialogue from a video file, match it to the music bed and check the result against the platform target before the final export.
Musicians
Check a mix with the LUFS meter, then turn rehearsal takes and demos up to a comfortable level for sharing.
Teachers and Students
Make lecture recordings and voice notes loud enough to follow on a phone speaker, even when the microphone sat at the back of the room.
Voice Over Artists
Normalize audio for client delivery and keep every take at the same loudness across a long project, from the first session to the last pickup line.
DJs and Playlist Makers
Even out a set of tracks so no song jumps out, then fix tempos with the BPM changer.
What Creators Say About Our Volume Booster
My guest recorded on a laptop and was barely audible. Two clicks to -16 LUFS and the episode sounded like we were in the same room.
Rachel Kim
Podcast Host
The meter shows me LUFS and true peak before I upload, so I finally know why my tracks were being turned down.
Jonas Weber
Producer
I drop a whole folder of lecture recordings in, set one target and download them all at the same level.
Amara Okafor
Teaching Assistant
Other boosters made my voice crackle. Here the limiter catches the loud words and the rest just gets louder.
Leo Martins
YouTuber
Volume Booster FAQs
Quick answers about boosting, normalizing and measuring loudness.
What is a volume booster?
A volume booster raises the level of an audio or video file so it plays louder on every device. This one adds a limiter after the gain, so the loudest moments stay clean instead of clipping.
How do I make audio louder without distortion?
Drop the file into the tool above and raise the gain, or pick a loudness target. The limiter keeps the peaks under the ceiling you set, so the audio gets louder without clipping. Push it very far and the limiter has to work hard, which can make the sound flatter, so the tool warns you when that happens.
What does audio normalization do?
Normalizing audio changes the level of a whole file so it reaches a set loudness. Loudness normalization targets the average level you hear, in LUFS; peak normalization only moves the single loudest sample to a set level.
What LUFS should I normalize to?
Use about -14 LUFS for streaming and video platforms, -16 LUFS for podcasts and -23 LUFS for broadcast under EBU R128, with a true peak ceiling around -1 dBTP.
What is the difference between LUFS and dB?
Decibels describe a level, such as a peak. LUFS describe loudness as the ear hears it over time, weighted toward the frequencies we are most sensitive to, which is why a LUFS meter is the better guide.
Will boosting the volume lower the quality?
Raising the level does not add distortion here because the limiter prevents clipping. It does raise any background hiss along with the voice, so clean noisy recordings with the background noise remover first. Quiet speech can usually go up 10 to 20 dB without trouble; beyond that the limiter works hard, so listen to the after version before you download.
Why does my normalized file still sound quiet?
Commercial tracks are heavily compressed, so they sound louder at the same LUFS reading. Raise the target a little, or let the limiter work harder, but keep an eye on the waveform.
Can I normalize several files at once?
Yes. Add up to 20 files, choose one target and the normalizer brings them all to the same loudness, ready to download together as a ZIP.
Which formats can I use, and does it work with video?
Common formats such as MP3, WAV, M4A, AAC, FLAC and OGG work, plus MP4 and MOV videos your browser can open, up to 200 MB and 15 minutes per file. With a video, the tool works on its soundtrack and downloads the result as WAV or MP3 audio.
Is the LUFS meter free?
Yes. It is a LUFS meter free for everyone, with no plugin to install: drop a file in and the LUFS analyzer reads integrated loudness, true peak, sample peak and RMS. Keep it open as a loudness meter online whenever you need a quick check before publishing.
What is true peak?
True peak estimates the highest level the waveform reaches between samples, which is where MP3 and AAC encoders can clip on playback. Keeping it at or below -1 dBTP leaves room for that, which is why it is the default ceiling here.
Do I need audio normalizer software?
No. Desktop audio normalizer software and studio plugins do the same job, but this tool runs in any modern browser on Windows, Mac, Linux, Android or iPhone, so there is nothing to install or keep up to date.
Are my files uploaded?
No. This audio normalizer online runs entirely in your browser, so your recordings never leave your device. It is free, with no sign-in.
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Make Your Audio Louder With the Free Volume Booster
Free, private and instant: drop a recording into the volume booster above, normalize it to the right LUFS target, compare before and after and download WAV or MP3.