Bring a quiet or inconsistent recording up to a safe, consistent peak level automatically — no manual dB guessing required.
The Audio Normalizer sets a file to a standard level. Two methods are offered: loudness normalisation to a LUFS target (what Spotify, YouTube, Apple Music, podcasts and broadcasters use) and classic peak normalisation to a dBFS ceiling.
Loudness mode uses the real ITU-R BS.1770-4 / EBU R128 algorithm — K-weighting, 400 ms blocks, absolute and relative gating — the same maths hardware broadcast meters use, not a rough RMS guess. A true-peak limiter then keeps the louder result from clipping.
The audio is K-weighted (a high-shelf at 1.68 kHz and a high-pass at 38 Hz that model human loudness perception), squared and averaged into 400 ms blocks with 75% overlap. Blocks below −70 LUFS are discarded, then blocks more than 10 LU below the remaining average are discarded too; the mean of what is left is the integrated loudness. The tool applies the dB difference to your target, then, if the true peak would exceed your ceiling, runs a 5 ms look-ahead limiter at that ceiling.
Peak mode simply scales the file so its loudest sample equals the chosen level — fast, but two files normalised to the same peak can sound very different in loudness.
Deliver −16 LUFS stereo (−19 mono) as Apple Podcasts and most hosts recommend.
Check how loud a track is against the −14 LUFS reference used by Spotify, YouTube, TIDAL and Amazon.
−23 LUFS for EBU R128 (Europe) or −24 LKFS for ATSC A/85 (US).
Make a set of clips sit at the same perceived level.
| Standard | ITU-R BS.1770-4 / EBU R128 (K-weighting, gating) |
|---|---|
| Targets | −14, −16, −19, −23, −24 LUFS or custom |
| Limiter | 5 ms look-ahead true-peak limiter |
| Peak mode | Any ceiling from −12 to 0 dBFS |
Loudness Units relative to Full Scale — a measure of perceived loudness. 1 LU equals 1 dB.
The highest level of the reconstructed analogue waveform, which can exceed the highest sample value.
Music streaming: −14 LUFS. Podcasts: −16 LUFS stereo, −19 LUFS mono. TV: −23/−24 LUFS.
Changing gain is lossless; only heavy limiting can change dynamics.
It measures the loudest peak in your file and applies a single volume adjustment so that peak lands exactly at your chosen target — the whole file is scaled by the same amount, so dynamics aren't changed, only overall level.
No — normalizing applies one flat gain change. It won't even out a file that has both very loud and very quiet sections; a compressor does that instead.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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