How it works
- 01
Upload audio
Drag and drop up to 15 files — WAV, MP3, FLAC, AAC, OGG, OPUS, or AIFF. Everything stays in your browser.
- 02
Choose platforms
Select one or more platform presets. LoudFix measures integrated LUFS and true peak using ITU-R BS.1770-4.
- 03
Download & upload
Get platform-ready files with the correct LUFS target and true peak ceiling. No re-upload needed.
Platform loudness standards
Targets verified March 2026. Always check official platform documentation before delivery.
| Platform | Target LUFS | True Peak |
|---|---|---|
| Spotify | -14 | -1 dBTP |
| Apple Music | -16 | -1 dBTP |
| YouTube / YT Music | -14 | -1 dBTP |
| Tidal | -14 | -1 dBTP |
| Amazon Music | -14 | -1 dBTP |
| Deezer | -15 | -1 dBTP |
| SoundCloud | -14 | -1 dBTP |
| Apple Podcasts | -16 | -1 dBTP |
| Spotify Podcasts | -14 | -1 dBTP |
| TikTok | -14 | -1 dBTP |
| Instagram Reels | -14 | -1 dBTP |
| Facebook / Meta | -14 | -1 dBTP |
| EBU R128 (EU Broadcast) | -23 | -1 dBTP |
| ATSC A/85 (US Broadcast) | -24 | -2 dBTP |
Want the full cheatsheet with codec recommendations? View the presets guide →
Why audio loudness normalization matters
Every major streaming platform — Spotify, Apple Music, YouTube, Tidal, Amazon Music — automatically adjusts your track's volume before it reaches listeners. They do this to ensure a consistent listening experience across millions of songs. The measurement they use is LUFS (Loudness Units relative to Full Scale), a perceptual loudness metric defined by the ITU-R BS.1770-4 standard.
If your track is mastered louder than the platform's target — say, you master to −8 LUFS but Spotify targets −14 LUFS — the platform will turn your track down by 6 dB. The loud master you spent hours perfecting will arrive at listeners' ears at the same volume as everything else. Worse, the aggressive limiting you applied to get loud may now sound pumped and compressed compared to quieter, more dynamic tracks that weren't turned down at all.
Conversely, if your podcast episode peaks at −20 LUFS and Apple Podcasts targets −16 LUFS, the platform may boost it by 4 dB — potentially pushing clipped or near-clipping moments into audible distortion. This is why the true peak limit (−1 dBTP on most platforms, −2 dBTP for ATSC broadcast) is just as important as the integrated LUFS target.
LoudFix measures your audio using the same ITU-R BS.1770-4 algorithm the platforms use, then applies a linear gain adjustment to hit the target exactly. No compression. No limiting. No dynamic range loss — unless you intentionally choose a lossy output format like MP3 or AAC. The goal is to give you a file that arrives at the listener's ears sounding exactly as you intended it, every time.
Recommended recording gear
Affiliate links — we earn a small commission at no cost to you. Only gear we'd actually recommend.
FIFINE K669B USB Condenser Mic
Plug-and-play cardioid condenser with volume knob and mute button. Ideal for podcasters and streamers on a budget.
Audio-Technica AT2020USB-X
Studio-grade cardioid USB condenser with 24-bit A/D conversion. Flat, extended frequency response for accurate recording.
Focusrite Scarlett Solo (4th Gen)
Two-input USB audio interface with Air mode and direct monitoring. The benchmark entry-level interface for home studios.
Audio-Technica ATH-M20x Monitor Headphones
40mm drivers with pro-grade extended frequency response. Closed-back isolation for accurate mixing without room treatment.
Frequently asked questions
- What is LUFS?
- LUFS stands for Loudness Units relative to Full Scale. It measures perceived loudness of audio over time, using a K-weighting filter that matches how human hearing works. Streaming platforms use LUFS targets to normalize all music to a consistent volume.
- Is my audio uploaded to a server?
- No. LoudFix processes all audio entirely in your browser using WebAssembly and the Web Audio API. Your files never leave your device.
- What audio formats does LoudFix support?
- LoudFix supports WAV, MP3, FLAC, AAC, OGG, OPUS, and AIFF as input formats. Output formats depend on the platform preset selected.
- What LUFS target does Spotify use?
- Spotify normalizes audio to −14 LUFS integrated loudness with a true peak limit of −1 dBTP. Tracks louder than this will be turned down; tracks quieter may be turned up.
- What is true peak and why does it matter?
- True peak measures the actual peak level of the reconstructed analog waveform, including intersample peaks that occur between digital samples. Streaming platforms cap true peak at −1 dBTP to prevent distortion during decoding.
- Does normalizing audio affect quality?
- LoudFix applies a linear gain adjustment only — it does not compress or limit the audio. This preserves 100% of your dynamic range. The only quality impact is from re-encoding to a lossy format (MP3, AAC) if you choose one.