Free Online Loudness Normalizer
Even out quiet and loud recordings so they sit at a consistent level.
What is this tool
AudioToolKit normalizes audio loudness online for free. It measures each recording and adjusts its gain so quiet and loud files sit at a consistent level — useful before publishing podcasts, voice notes or batches of interview clips. Output in the original format, MP3, WAV, M4A, FLAC, OGG or AIFF, with files deleted automatically after the job finishes.
Drag and drop your files here
or
MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, AIF, OPUS, WMA, AMR — up to 25 MB per file
Output
One loudness-normalized file per input
Accepted formats
.mp3, .wav, .m4a, .aac, .ogg, .flac, .aiff, .aif, .opus, .wma, .amr
Why use this free tool
Voice notes recorded at arm's length and interviews recorded up close should not jump in volume. Loudness normalization brings each file to a consistent level before you publish it.
How does the free normalize audio work?
- 1
Upload the recordings that are too quiet or uneven.
- 2
Pick an output format, or keep the original.
- 3
Press Normalize and download the leveled audio.
Frequently asked questions
What does normalize do?
It adjusts gain so the file's loudness is consistent, which helps podcasts, voice notes and batches of clips sit at a similar volume.
Will it remove noise?
No. It changes level, not the noise floor. Trim the clip first if you only need part of it.
Can I normalize several files?
Yes on Pro, up to the batch limit. Each file is returned separately, or as a zip when there is more than one.
Related tools
More answers in the Help Center.