Measure the LUFS of a song or podcast and set it to -14, -16 or -23 LUFS, in your browser
Processed in your browser. Nothing is uploaded. Checked against sources on 17 Oct 2026.Audio Loudness Normalizer measures a file's integrated loudness with the ITU-R BS.1770-5 method and applies one gain to reach -14 LUFS for streaming, -16 for podcasts or -23 for EBU R128 broadcast. True peak is kept at or under -1 dBTP, and the file never leaves your browser.
Press Choose an audio file or drop an MP3, M4A, WAV, OGG or FLAC; it is decoded on your device.
Read the measured loudness in LUFS and the true peak in dBTP under the player.
Pick the target: -14 LUFS for streaming, -16 for podcasts or -23 for EBU R128 broadcast.
Press Normalize loudness, then Download the WAV.
Peak normalising makes the loudest sample hit a level; loudness normalising makes the whole file sound as loud as a target. Streaming services and broadcasters work in loudness, measured in LUFS (loudness units relative to full scale), which is why two songs peaking at the same level can still sound very different.
How the measurement works. The method is the one in ITU-R BS.1770-5, the standard Spotify, Apple and the EBU all cite:
| Step | What happens |
|---|---|
| K-weighting | A high-shelf filter models the head, a high-pass filter removes rumble |
| Gating blocks | 400 ms blocks, a new one every 100 ms |
| Absolute gate | Blocks quieter than -70 LUFS are ignored |
| Relative gate | Blocks more than 10 LU below the average are ignored |
| True peak | The signal is oversampled four times to find peaks between samples |
The result is the integrated loudness of the programme, the number the platforms compare against their target.
Which target. Spotify turns every track to -14 LUFS. Apple Podcasts asks for about -16 LKFS with a true peak no higher than -1 dB. EBU R 128 sets European broadcast at -23 LUFS. Any value from -40 to -5 can be typed in.
What changes, and what does not. One gain is applied to the whole file, so the dynamics stay exactly as they were. Nothing is compressed or limited. When reaching the target would push the true peak above -1 dBTP, the gain stops at that ceiling and the page says which loudness it reached, so you can decide whether to compress the recording first. The result is a 16-bit WAV at the original sample rate.
Checked against the standard. The tests compare the meter with a separately written implementation of the equations and confirm the Recommendation's own check: a full-scale 997 Hz tone reads -3.01 LUFS. Nothing is uploaded.
LUFS stands for loudness units relative to full scale. A meter weights the sound the way ears hear it, ignores silence and very quiet passages, and averages the rest, following ITU-R BS.1770. One LU is one decibel, so a file at -20 LUFS needs 6 dB of gain to reach -14.
Spotify adjusts tracks to -14 LUFS, according to its loudness normalization page. A louder master is turned down and a quieter one is lifted, as far as its peaks allow. Normalising to -14 here shows what listeners will hear, and keeps the true peak under -1 dBTP for lossy encoding.
Apple Podcasts recommends about -16 LKFS, plus or minus one decibel, with a true peak no higher than -1 dB FS. LKFS and LUFS are the same unit. Choose -16 here and every episode lands at the same level, so listeners stop reaching for the volume between shows.
Reaching the target would have pushed the true peak above -1 dBTP, which distorts after MP3 or AAC encoding. The gain stops at the ceiling and the page shows the loudness actually reached. Compress or limit the recording in an editor first, or switch the ceiling off if you accept clipping.
No. Peak normalization lifts the single loudest sample to a level, so a recording with one loud clap stays quiet overall. Loudness normalization measures the whole programme as ears hear it. Two files normalised to -14 LUFS sound equally loud; two peak-normalised files often do not.
No. The file is decoded by your browser, measured and changed on your device, and the WAV is created there too. Nothing is sent to a server, so unreleased songs and private recordings stay private. Closing the tab removes everything.
Rates and rules change; check the source before you rely on a figure.
Still stuck? Ask about Audio Loudness Normalizer (LUFS) and anybody who knows can answer. No account needed.
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