Audio Normalizer
A free online audio normalizer that evens out loudness to a consistent level (EBU R128 / LUFS). Level an MP3, WAV or M4A to a streaming, podcast or broadcast target and download a normalized MP3. Runs in your browser with ffmpeg — your file is never uploaded.
How do I normalize the volume of an audio file?
To normalize audio, load your file, choose a target loudness and press Normalize — the tool measures the perceived loudness and adjusts the gain to reach that target using EBU R128 loudness normalization (LUFS), with a true-peak limit so it never clips, then hands you a normalized MP3. Pick -14 LUFS for music and streaming, -16 LUFS for podcasts, or -23 LUFS for broadcast. Normalizing to the same target across several files makes them all sit at a consistent volume. It reads almost any input (MP3, WAV, M4A, FLAC, Opus and more) and runs entirely on your device, so nothing is uploaded. Just want a fixed boost? Use the Volume Booster; to stitch files together, the Audio Joiner.
Frequently Asked Questions
What does normalizing audio do?
Normalizing evens out the loudness of a recording to a consistent target level, so it is not noticeably quieter or louder than other tracks. This tool uses EBU R128 loudness normalization (measured in LUFS), the same standard streaming services and broadcasters use, which adjusts to how loud audio actually sounds to the ear rather than just the peak level. Load a file, pick a target, and download a normalized MP3 — great for making a playlist, podcast episodes or a batch of clips all sit at the same volume.
Which target loudness should I choose?
Use -14 LUFS for music and most streaming platforms (Spotify, YouTube and Apple Music all target around -14). Use -16 LUFS for podcasts and spoken word, which is the common podcast standard and the default here. Use -23 LUFS for broadcast television and radio, the EBU R128 broadcast reference. If you are unsure, -16 LUFS is a safe, natural-sounding choice for most everyday audio.
Is normalizing the same as boosting the volume?
No — normalizing is not the same as boosting. A volume boost multiplies the whole signal by a fixed amount, which can push loud parts into distortion. Normalizing targets a perceived-loudness level and adjusts the gain to reach it, bringing quiet recordings up and loud ones down toward a consistent target, with a true-peak limit to prevent clipping. If you just want a quiet file louder by a set amount, use the Volume Booster instead; to make several files match each other, normalize each to the same target.
Is my audio uploaded, and what format do I get back?
Nothing is uploaded — normalization runs entirely in your browser with ffmpeg compiled to WebAssembly, and the engine downloads once (about 10 MB) then later runs start instantly. The normalized result is saved as an MP3 at the bitrate you choose, which plays everywhere; if you need another format, run the MP3 through the Audio Converter. Your original file and the normalized result never leave your device, so it works offline after that first load and there is nothing to sign up for.
Can I normalize a whole batch to match?
Yes — normalize each file to the same LUFS target and they will all sit at a consistent loudness relative to each other, which is exactly what a normalizer is for. Do them one at a time here, choosing the same target for each. To then stitch them into one file, use the Audio Joiner; to trim silence off the ends first, the MP3 Trimmer.