You upload your song to Spotify, hit play, and it sounds quieter than the others. Why? One word: LUFS. In this post I'll explain what they are, why they changed everything in modern mastering, and how to master correctly for each platform. No empty technical jargon.
What are LUFS, simply put?
LUFS stands for Loudness Units relative to Full Scale. It's the unit that measures how loud the human ear perceives your song, not how high the peak is.
Many people confuse "volume" with "loudness". Let's break it down:
- Peak: the highest point of the wave. If it goes above 0 dB, it distorts.
- RMS: the average energy of the signal.
- LUFS: how loud it actually SOUNDS. It accounts for how the human ear perceives different frequencies.
Two songs can both have peaks at 0 dB and yet one sounds much louder than the other. The difference is measured in LUFS.
Standards by platform (2026)
Each platform normalizes volume so all songs sound at the same level. If your song is louder than the target, the platform turns it down. If it's quieter, it usually leaves it alone (or boosts it if "loudness boost" is on). These are the current targets:
Spotify: -14 LUFS integrated
If your master is louder than -14 LUFS, Spotify turns it down. If it's quieter, it leaves it as is (unless you enable "Normalize audio" in settings and choose "Loud" mode which boosts up to -11 LUFS).
Recommendation: master between -14 and -10 LUFS. If you master louder than -10, Spotify will turn you down and you'll lose dynamics for nothing.
YouTube: -14 LUFS integrated
Same target as Spotify. YouTube has been normalizing since 2015. Any video over -14 LUFS gets turned down on upload.
Recommendation: -14 LUFS is ideal so the video sounds at the same level as competing songs.
Apple Music: -16 LUFS integrated
Apple Music is the most conservative. Its "Sound Check" turns everything down to -16 LUFS if it's louder.
Recommendation: if you want to preserve dynamics for Apple Music, master to -16 LUFS. If you master higher, Apple turns it down anyway.
Tidal: -14 LUFS integrated
Tidal uses -14 LUFS standard for normal mode and -18 LUFS for high-quality audiophile mode.
Radio (FM): -23 LUFS
European radio (EBU R128) and serious broadcasters use -23 LUFS with ±1 LU tolerance. Much lower than streaming because radio prioritizes dynamics and listening comfort in cars/homes.
Why does your song sound quieter than Top 50 tracks?
Three typical reasons:
1. Your mix is squashed before mastering
If you arrive at mastering with a mix that already has excessive compression, there's no headroom to push volume without losing quality. The song "feels squashed" but LUFS won't go up.
2. You're mastering at the wrong loudness
If your master is at -18 LUFS because "it stays dynamic", on Spotify it'll sound quiet compared to other artists who mastered at -10 or -11 LUFS. Spotify doesn't BOOST you — it only turns you DOWN when you're louder.
3. True Peak is mismeasured
Your song may show peaks at -1 dB but when converted to MP3/AAC for streaming, peaks rise via inter-sample interpolation. This causes audible distortion. Solution: limit True Peak to -1 dBTP (not 0 dBTP).
How to measure LUFS (free and paid plugins)
You don't need expensive plugins to measure LUFS. These are the best:
Free
- Youlean Loudness Meter 2 (free): the industry standard for measuring LUFS without paying. Shows Integrated, Short-Term, Momentary, True Peak and a histogram. youlean.co
- Voxengo SPAN (free): although it's a spectrum analyzer, it also includes a loudness meter and True Peak. Excellent for mixing.
- dpMeter (free, TBProAudio): very precise LUFS meter.
Paid (professional standard)
- iZotope Insight 2: the most complete, integrated in Mastering Bundle suite.
- Waves WLM Plus: popular, easy to use.
Personally I use Youlean during sessions + a paid meter to confirm before exporting. Free and professional can coexist perfectly.
How to master to the right target (step by step)
Start with a mix that has headroom
Your final mix should have peaks at -6 dB or lower. If it reaches 0 dB, you're already clipping before mastering. No headroom = no mastering possible.
Process the mastering chain
Typical chain: corrective EQ → gentle multiband compressor → tonal EQ → saturation (optional) → limiter. Each step should add, not compensate for mix mistakes.
Aim at the target with the limiter
The final limiter controls peaks and pushes loudness. Set:
- Output ceiling: -1.0 dBTP (NOT 0 dBTP)
- Threshold: adjust to reach -14 LUFS integrated on a 3-4 minute song
- Style: depends on genre (transparent for ballads, aggressive for rock/pop)
Verify with A/B
Compare your master against a reference song from the same genre. Match loudness when comparing (a plugin like ADPTR Metric AB helps) — otherwise, the louder one always seems "better".
Export WAV 24-bit
For distributors (DistroKid, CD Baby, TuneCore): WAV 44.1 kHz / 24-bit. Platforms handle conversion to their formats. Never upload an MP3.
Common LUFS myths
"Louder = better"
False. If you master to -8 LUFS thinking it'll sound louder on Spotify, Spotify will turn you down to -14 LUFS and you'll have sacrificed dynamics for free. Today "louder" isn't the advantage it was in the 2000s.
"-14 LUFS is universal law"
False. It's the dominant target for streaming, but not mandatory. Some genres (EDM, metal) often master at -10/-9 LUFS because constant energy allows it. Ballads or jazz stay at -16/-18 LUFS because dynamics matter.
"If they normalize, mastering doesn't matter"
False. Normalization only equalizes perceived volume. If you mastered badly (with distortion, no dynamics), that stays even when volume gets matched.
"True Peak and Sample Peak are the same"
False. Sample Peak measures peaks at digital samples. True Peak (dBTP) measures actual peaks after D/A conversion or codecs. Your song may show -0.3 dB on Sample Peak and +0.2 dBTP — and that 0.2 dBTP causes audible distortion on Spotify.
Loudness War: historical context
From the 90s to the 2010s, the industry pushed masters louder and louder. 80s records had ~14 dB of dynamic range. 2008 records (Metallica's "Death Magnetic" era) had 4-5 dB. The consequence: ear fatigue, subtle distortion, loss of impact.
When Spotify, YouTube and Apple introduced normalization (2014-2015), the "loudness war" lost meaning. Today, mastering louder than -10 LUFS doesn't benefit you on streaming — on the contrary, you sacrifice quality for nothing.
The good news: we're returning to more dynamic, more natural masters that respect the original mix. It's a good time to make music.
Practical recommendation for your next single
If you're mastering your song mainly for Spotify/YouTube/Apple Music:
- Master aiming at -14 LUFS integrated (measured over the whole song, not just the chorus)
- True Peak limited to -1.0 dBTP
- Verify with Youlean Loudness Meter
- A/B compare with 2-3 songs from the same genre
- Export WAV 44.1 kHz / 24-bit
That's enough for your song to sound competitive without sacrificing dynamics unnecessarily.
Frequently asked questions
If I master at -10 LUFS, does Spotify turn me down to -14?
Yes, exactly. The difference (4 LU) is the "punch" you lose. That's why mastering above -10 LUFS for streaming makes no sense.
What if I want to distribute to radio/CD too?
Ideally deliver two masters: one at -14 LUFS for streaming, one at -23 LUFS (with less limiter) for radio. If you can only do one, prioritize streaming.
Does Spotify boost songs quieter than -14 LUFS?
Not by default. Only if the user activates "Normalize audio" in "Loud" mode in settings, Spotify boosts up to -11 LUFS. But most users use normal mode where it only turns down, never boosts.
What about podcasts? Same target?
No. Podcasts use -16 LUFS as standard (Apple Podcasts, Spotify Podcasts). Aim at -16 LUFS for podcast mastering.
Is professional mastering worth paying for?
If you're starting out, mastering yourself with free plugins is valid. But professional mastering brings: trained ears that detect problems you don't hear, better quality equipment, and the final "aesthetic" decision that separates a decent master from an excellent one. If you're interested: here I explain pricing and here's my mastering service.
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