Music loudness normalizer free, in your browser
Find out how Spotify, Apple Music, YouTube and the rest will play your track, then set it to their level with peaks held under the ceiling. It runs on your device and saves a WAV or MP3.
Processing runs on your device. Up to 200 MB and 60 minutes. Nothing is uploaded.
What to expect
- Cost and privacy
- Free, with no account. Processing runs on your device; your audio is never uploaded.
- Use it for
- Measure a finished song's integrated loudness, loudness range and true peak, then set it to Spotify, Apple Music, YouTube, Amazon Music, Tidal or a level you choose.
- Inputs and output
- Mono or stereo WAV, MP3, M4A and other files your browser can decode. Saves a 16-bit WAV or a 192 kbps MP3.
- Limits
- Up to 200 MB and 60 minutes, subject to available browser memory.
- Keep in mind
- Turning a loud master down is one clean gain change. Turning a quiet one up uses a true-peak limiter, which can soften the hardest hits. It does not master or EQ your mix.
How to set music loudness, in four steps
- STEP 01
Choose the finished master
Drop a WAV, MP3 or M4A of the mixed and mastered song. It decodes on your device and nothing is uploaded.
- STEP 02
Pick where it's going
Spotify is the default. Choose Apple Music, YouTube, Amazon Music, Tidal, SoundCloud, or a club or CD master with your own level and peak ceiling.
- STEP 03
Read the sentence, then the numbers
The top line says what that service will do with your track. Below it are integrated loudness, loudness range, true peak and the gain applied, before and after.
- STEP 04
Compare and download
Play Before and After from the same spot, then save a 16-bit WAV or a 192 kbps MP3 at the level you chose.
How loud should a song be for Spotify?
Spotify plays music at -14 LUFS on its normal setting, and YouTube, Amazon Music and Tidal sit close to that. Apple Music's Sound Check plays songs at about -16. Each service measures your whole track and moves it toward that level, so a master louder than -14 is simply turned down when someone presses play.
That is why a very loud master doesn't win on Spotify. The limiting that made it loud also flattened its drums, and once Spotify turns it down it can sound smaller next to a more open master at the same level. A quiet track has the opposite problem: Spotify turns it up only until its peaks reach -1 dB, and YouTube, Amazon Music and Tidal don't turn it up at all.
This tool measures integrated loudness with the ITU-R BS.1770 method, loudness range with EBU Tech 3342, and true peak with 4x oversampling. When your track is louder than the target, it turns the whole song down with one gain change. That is lossless: nothing is limited or reshaped. When it is quieter, it turns it up and a true-peak limiter holds the peaks under the ceiling, and the screen says how hard the limiter had to work.
Everything runs in a Worker on your device, so the track is never uploaded. For a club or CD master, choose your own level and ceiling. Measure the final MP3 or AAC too, because lossy encoding can push peaks up.
Music loudness by service
Spotify is the only one here that publishes its numbers. The others come from published measurements and are marked as such. SoundCloud does no loudness matching at all.
CHECKED NOVEMBER 5, 2026
| WHERE | LOUDNESS | TRUE PEAK | QUIET TRACKS | WHAT IT MEANS |
|---|---|---|---|---|
| Spotify | -14 LUFS | -1 dBTP | Turned up until peaks reach the ceiling | Spotify plays music at -14 LUFS on its normal setting. It turns quiet tracks up only until their true peak reaches about -1 dB, and asks for peaks under -1 dBTP (under -2 for masters louder than -14). Spotify loudness normalization. |
| Apple Music | -16 LUFS | -1 dBTP | Not published | Sound Check, on by default on newer Apple devices, plays songs at about -16 LUFS. Apple publishes no number itself, so this comes from a published test. MeterPlugs on Apple's switch to LUFS (secondary source). |
| YouTube | -14 LUFS | -1 dBTP | Left as it is | YouTube turns loud uploads down to about -14 LUFS and leaves quiet ones alone. There is no official document; this comes from published measurements. Loudness Penalty measurements (secondary source). |
| Amazon Music | -14 LUFS | -2 dBTP | Left as it is | Amazon Music turns loud tracks down to about -14 LUFS and does not turn quiet ones up. A -2 dBTP ceiling leaves room for its lossy streams. No official document; this comes from published measurements. Loudness Penalty measurements (secondary source). |
| Tidal | -14 LUFS | -1 dBTP | Left as it is | Tidal turns loud albums down to about -14 LUFS and does not turn quiet ones up. No official document; this comes from published measurements. Loudness Penalty measurements (secondary source). |
| SoundCloud | No matching | -1 dBTP | Left as it is | SoundCloud does no loudness matching, so every upload plays exactly as loud as it is. -14 LUFS is our suggestion because it matches most other services. |
| Club or CD master | You choose | -1 dBTP | Your call | CDs and club play have no loudness matching, so the level is your call. Loud dance and rock masters often sit between -10 and -7 LUFS; every extra dB comes from limiting. |
What it does not do
- It sets loudness with one gain change and a peak limiter. It does not master, compress or EQ, so it can't make a thin mix sound full.
- Big boosts mean heavy limiting. Raising a very quiet track by 10 dB or more can soften the drums; the screen shows how much the limiter took off.
- Some services can play a whole album at one level, so a quiet ballad stays quieter than the loud single. Normalizing each song here on its own removes that difference. For an album, give every track the same gain in your editor instead.
Questions
Why does my song sound quieter on Spotify than other songs?
Usually it is quieter than -14 LUFS with its peaks already near the top. Spotify turns quiet tracks up only until the peaks reach -1 dB, so a dynamic master can end up a few dB under everything else. Raise it here with the true-peak limiter, or master it a little louder. If your song is louder than -14 and still sounds smaller, heavy limiting is the usual cause: Spotify turned it down and the squashed drums show.
What LUFS should I master to?
For streaming, about -14 LUFS integrated with true peaks under -1 dBTP is a safe aim. Spotify, YouTube, Amazon Music and Tidal play close to that, and Apple Music at about -16. Plenty of genres are mastered louder on purpose, which is fine, but past -14 the extra loudness is turned down on playback. Spotify suggests peaks under -2 dBTP if you master louder than -14.
Is -14 LUFS a rule?
No. It is the level Spotify plays music at on its normal setting, not an upload requirement. Spotify accepts any level and adjusts it, and Premium listeners can pick Loud at -11 or Quiet at -19 instead. Apple Music, SoundCloud, CDs and club systems all work differently.
Does loudness normalization change the quality?
Turning a track down doesn't. It is one gain change across the whole song, so the sound and dynamics stay exactly as they were, only quieter. Turning a track up past the room its peaks have needs a limiter, which does change the loudest moments a little. This tool tells you how many dB the limiter took off so you can judge by ear.
Should I upload a file already set to -14 LUFS?
You can, but Spotify, YouTube, Amazon Music and Tidal match loudness anyway. It matters most where nothing does that for you, like SoundCloud, a DJ set or files on a playlist, and for hearing how your master will sit next to other songs before release.
Does it upload my song?
No. Decoding, measuring, the gain change and the export all run in your browser. Nothing is sent to a server.