Normalize audio loudness to a target LUFS
Even out and boost the loudness of an audio clip.
To normalize audio, upload a file and choose a loudness target: quiet (-23 LUFS), standard (-16 LUFS) or loud (-11 LUFS). The audio normalizer measures how loud the recording is overall and adjusts it toward that target, so a quiet voice recording and a loud music track end up at a similar perceived volume. It targets loudness, not just peak level, and the result is saved as an MP3.
How to normalize an audio file
Choose a file up to 50 MiB, pick a target loudness and submit the form. Standard is preselected. The output keeps your file name with -normalized added and is always an MP3. Play it back at the same system volume as the original to hear the difference.
What the three targets mean
LUFS measures perceived loudness, and lower numbers are quieter. -23 LUFS is the broadcast reference level, -16 LUFS is a common level for podcasts and streaming, and -11 LUFS is noticeably louder and closer to a mastered pop track. If you are unsure, use standard. Platforms often apply their own loudness rules afterwards, so treat these as sensible defaults, not a guarantee of how a service will play your file.
How the processing works
The tool applies the loudnorm filter with a true-peak ceiling of -1.5 dB and a loudness range target of 11, which means very quiet and very loud passages are brought closer together without clipping. It cannot repair distortion, background noise or a recording that was clipped to begin with, and extreme gain on a noisy file will raise the noise too.
Before and after other tools
Normalize each clip before joining them with Merge Audio so they sit at the same level. If you only need a smaller file, use the Audio Compressor instead. Output is lossy MP3, so convert it with the Audio Converter only if a format change is needed.
Frequently asked questions
What does normalizing audio do?
It adjusts the overall volume so the recording reaches a chosen loudness target. Here the targets are -23, -16 and -11 LUFS. Quiet audio is raised and loud audio is reduced, with a true-peak limit to avoid clipping.
Which loudness should I choose for a podcast?
Standard, at -16 LUFS, is a common level for podcasts and streaming. Choose quiet at -23 LUFS for broadcast-style material, and loud at -11 LUFS only if you want a punchier result.
Is this the same as peak normalization?
No. Peak normalization scales the audio so its highest peak hits a level. This tool uses loudness normalization with the loudnorm filter, which measures perceived loudness over the whole file and so matches how volume is actually heard.
Can normalizing fix a noisy or distorted recording?
No. It changes level, not quality. Raising a quiet noisy recording also raises the noise, and clipping that is already in the file stays. Record again if the source has serious problems.
What file types and sizes does the audio normalizer accept?
You can upload MP3, WAV, FLAC, OGG, AAC or M4A files up to 50 MiB, one at a time. The result is an MP3. Processing is cancelled if it takes longer than three minutes.
Related tools
Audio Converter
Convert between MP3, WAV, FLAC and more.
Use tool →Audio Compressor
Reduce audio file size for easy sharing.
Use tool →Trim Audio
Cut an audio clip down to a specific start and duration.
Use tool →Merge Audio
Combine multiple audio clips into one, in order.
Use tool →Audio Speed Changer
Speed up or slow down an audio clip.
Use tool →