Audio Normalizer (Loudness)
Make audio files equally loud: set a loudness target such as -16 LUFS for podcasts or -14 for streaming.
Runs in your browser Your input never leaves your device.
Drop an audio file here, or .
Your file is processed in your browser and never uploaded. The first run downloads the ffmpeg engine (about 25 MB) from a public CDN.
Report a problem with this tool
About this tool
Louder is not the same as higher peaks: people hear loudness, which is measured in LUFS (loudness units relative to full scale). Streaming services and broadcasters play audio at a standard loudness, so a quiet file sounds weak and a loud one gets turned down. Choose a target (-14 LUFS for streaming, -16 for podcasts and general use, -18 for a more relaxed level, -23 for broadcast under EBU R128) and the tool adjusts the whole file with ffmpeg's loudnorm filter, with a true-peak ceiling of -1.5 dBTP so that the result does not clip. The result is resampled to 48 kHz and saved as MP3, M4A or WAV. We measured the output of a quiet test tone with an EBU R128 meter for the targets -14, -16 and -23: the integrated loudness was within 1.5 LU of the target each time and the true peak stayed below -0.9 dBFS. The method works in a single pass and is approximate for very short files and for files with big changes of level; for music production use a two-pass tool or your editor. We checked the ffmpeg commands this tool builds by running them with a real ffmpeg on test clips and measuring the results (sizes with ffprobe, picture content with ImageMagick, sound with a spectrum and loudness meter), and the page itself in a browser with the real ffmpeg.wasm engine. The first use downloads the ffmpeg engine (about 25 MB), which then stays in your browser cache. It needs a current desktop Chrome, Edge or Firefox; large videos use a lot of memory, and very long clips can fail on small devices. Your file is processed in your browser with ffmpeg and never uploaded.
How to use it
- Choose an audio file.
- Choose the loudness target and the format.
- Press Process.
- Download the normalised file.
Common problems
- The result is quieter than I expected
- The target decides the loudness. -16 LUFS is not very loud; choose -14 for a louder result.
- It sounds squashed
- Loudness normalisation can limit peaks of very dynamic music. Choose a quieter target such as -18 or -23.
- A very short file is not exact
- Loudness is measured over time. Files under a few seconds may end up a little away from the target.