Fix quiet, uneven, or inconsistent volume in one step. Upload a file, hear the result, and download clean, level audio.
This free audio normalizer fixes the single most common problem in home and mobile recordings: uneven, unpredictable volume. One clip is whisper-quiet, the next is blaring, and listeners keep reaching for the volume knob. Normalization solves that by measuring the true perceived loudness of your file and lifting or lowering the whole thing to a single, steady target.
The technical name for that target is LUFS, short for Loudness Units Full Scale. Think of LUFS as a measurement of how loud audio actually feels to a person, not just how tall the waveform spikes. Streaming and podcast platforms all publish LUFS targets so that every track sits at the same comfortable level. This tool normalizes to -16 LUFS, the standard target for spoken-word podcasts, so your voice recordings land right where podcast apps expect them.
It is built for podcasters evening out episodes, creators prepping voiceovers, students cleaning up lecture recordings, and anyone who wants their audio to just sound right without opening a full editor. The process uses true-peak limiting, which raises the level while keeping the peaks safely below clipping, so you get a louder, more consistent result without adding distortion. You will hear the normalized file play right in your browser before you commit to the download.
Working with speech? Once your levels are even, run the file through our background noise remover for a cleaner recording, or send it to the audio to text converter for a transcript. Need captions? The SRT generator builds subtitle files, and the mic test checks your gear before you record.
Files are capped at 100 MB and free use is limited to 30 requests per hour. Need batch normalization, longer files, or automated processing in your own app? See pricing.
Normalization adjusts the overall volume of your recording to a consistent target so it is neither too quiet nor too loud. Unlike simple volume boosting, loudness normalization measures how loud the audio really sounds to a human ear and then raises or lowers the whole file to hit a standard level. The result is audio that plays back at a comfortable, even volume without you riding the volume knob.
LUFS stands for Loudness Units Full Scale, the standard measurement for perceived loudness. It matters because your ears judge loudness differently than a raw peak meter does. Podcast and streaming platforms target specific LUFS values so every episode or track sounds equally loud. This tool normalizes to -16 LUFS, the widely used target for spoken-word podcasts, which keeps voices clear and consistent across players.
No. This tool uses loudness normalization with true-peak limiting, which means it raises the overall level while holding the peaks below the point where digital clipping and distortion happen. If your source is already clean, the output stays clean and just sits at a steadier volume. Badly recorded or already-distorted audio cannot be repaired by normalization, since the distortion is baked into the original.
This browser tool handles one file at a time, which covers most personal projects. If you need to normalize a whole podcast back catalog, a batch of interviews, or run normalization automatically inside your own app, the SoundHalo API does exactly that. See the pricing page for batch and automated options.
You can drop MP3, WAV, M4A, AAC, FLAC, OGG, and the audio from common video files like MP4 and MOV. The normalized result is returned as a WAV file so you get lossless quality to work with. If a format ever fails, convert it to MP3 or WAV and try again.