LUFS Loudness Normalizer Online
Match any audio file to a −23, −16, or −14 LUFS target for broadcast, podcast, or streaming — right in your browser. K-weighted measurement, peak-safe output, no sign-up, and your file is never uploaded.
How to Normalize Loudness to LUFS
No account, no upload — measure, match, download.
Drop Your Audio
MP3, WAV, M4A, FLAC, OGG, or AAC up to 200 MB. It decodes in the browser and shows the current loudness in LUFS.
Pick a Target
Choose −23 LUFS (broadcast), −16 LUFS (podcast), or −14 LUFS (streaming). The tool works out the exact gain needed.
Normalize & Download
Gain is applied with peak clamping, then preview the result and download a 192 kbps MP3 at your chosen loudness.
Why Notevibes LUFS Normalizer
Real perceived-loudness targeting, peak-safe, instant.
Three Industry Targets
−23 LUFS for EBU R128 broadcast, −16 LUFS for podcasts, −14 LUFS for music streaming. Tap the one your platform expects.
K-Weighted Measurement
An ITU-R BS.1770 K-weighting approximation via shelf and high-pass filtering — accurate to within about ±0.5 LU on speech and music.
Live Loudness Readout
The moment your file decodes, its current LUFS shows next to the file name, so you know exactly how far the gain has to move.
Never Uploaded
Measurement and gain run in your browser with the Web Audio API. Your file never leaves your device — there is nothing to delete because nothing was sent.
No Inter-Sample Clipping
Output peak is clamped at ±0.99, so raising loudness can't push samples past the ceiling and cause harsh digital clipping.
Free, Anywhere
No sign-up, no daily limits, no watermark. Works on phones, tablets, and laptops in any modern browser.
Nothing to Upload, Nothing to Leak
The loudness measurement and gain happen on your own device. Your file never touches a server — which is a stronger promise than any “we delete it later”.
No Upload
Measurement runs on your own device
No Account
Start matching loudness immediately
Works Offline
Once the page loads, no connection needed
What People Match to LUFS
One tool for every “hit the platform’s loudness” moment.
Podcast Publishing
Hit −16 LUFS so episodes match every other show in the app
Streaming Masters
Land Spotify's −14 target so tracks aren't turned down on you
YouTube Voiceover
Reach −14 LUFS for YouTube's preferred speech loudness
Broadcast Handoff
Stay inside EBU R128 spec (−23 LUFS) for radio and TV delivery
Audiobook Delivery
Set a steady perceived level for comfortable long-form listening
Album Consistency
Make every track on a release land at the same loudness
Loud Enough for the Platform, Not Louder
Upload a podcast that’s a few LUFS too quiet and the app turns it up unevenly; upload one that’s too hot and it gets pulled down, sometimes with lossy attenuation. The fix isn’t guesswork — it’s matching a number. This tool measures your file’s current loudness, then applies exactly the gain needed to land on the target your platform expects, without the desktop-editor detour or a converter site that uploads your audio.
Perceived loudness, not just the loudest sample
A quiet interview and a heavily compressed song can peak at the same level yet feel worlds apart in volume. That’s the gap peak normalization can’t close. LUFS measures how loud audio actually feels, using a K-weighted ITU-R BS.1770 approximation, so a −16 LUFS podcast sounds like every other −16 LUFS podcast. When you only need to raise a quiet file to a safe peak, the peak normalizer is the simpler choice.
Three targets, one tap each
−23 LUFS is EBU R128 for broadcast handoff. −16 LUFS is where Apple and Spotify podcasts live. −14 LUFS is the music-streaming master target. The current loudness shows the moment your file loads, so you can see exactly how far it has to move — and the output is clamped at ±0.99 so raising the level never introduces clipping. If your source has spiky transients, tame them with the limiter or even out the dynamics with the compressor first.
Private because it never leaves
Unreleased episodes and masters are exactly the files you don’t want sitting on someone else’s server. Here the measurement and gain run on your own device — the same Web Audio engine that powers the full Notevibes editor. Because there’s no server doing the work, there’s nothing to meter: no watermark, no daily cap, no sign-up, files up to 200 MB.
When loudness is one step of many
Matching loudness is usually the last step before delivery. When the file also needs cuts, cleanup, or AI tools first, open it in the online audio editor, where limiter, normalizer, EQ, and effects stack in one pass.
Need Limiting and Loudness Together?
The full Notevibes editor stacks limiter, normalizer, EQ, and effects — process whole tracks with metering, then export to MP3 or WAV.
Free to try · No credit card required
Related Audio Tools
More free AI audio tools from Notevibes — same engine, no sign-up.
Audio Normalizer
Boost audio to peak volume without clipping.
Audio Compressor
Even out loud and quiet parts with dynamics compression.
Audio Limiter
Brick-wall limit peaks without distortion.
Audio Volume Booster
Increase volume by +3 to +12 dB.
Audio Converter
Convert any audio or video file to MP3 or WAV.
Online Audio Editor
Multi-track browser editor with every tool built in.
LUFS Loudness Normalizer FAQ
What is LUFS?
LUFS (Loudness Units relative to Full Scale) is the modern standard for measuring perceived loudness, defined by ITU-R BS.1770 / EBU R128. Unlike peak normalization, which only looks at the loudest sample, LUFS approximates how loud humans actually perceive audio — closer to how we hear.
What are the standard LUFS targets?
−23 LUFS = EBU R128 (European broadcast). −16 LUFS = podcast platforms (Apple Podcasts, Spotify Podcasts). −14 LUFS = music streaming (Spotify, YouTube, Tidal). Below those targets, platforms apply downward leveling; above, they may turn your audio down.
How is this different from peak normalization?
Peak normalization scales audio so the loudest sample sits at a target dB, typically just below 0 dB. It doesn't account for perceived loudness — a quiet podcast and a heavily compressed song can both peak at the same level yet feel very different in volume. LUFS targets perceived loudness instead, so files match in feel across genres and platforms.
Why is the LUFS measurement an approximation?
True ITU-R BS.1770-4 uses K-weighting (a specific shelf plus high-pass curve) and gated 400 ms blocks. This tool uses BiquadFilter approximations of K-weighting and an ungated mean-square measurement — accurate to within about ±0.5 LU on speech and music. That's plenty for matching to streaming and broadcast targets.
Will the output clip after normalization?
No — the output is clamped at ±0.99 to prevent both digital and inter-sample clipping. If your input has loud transients, run it through a limiter first to control them before matching loudness.
Is the loudness normalizer free?
Yes. Completely free with no sign-up, no watermark, and no limits. Max file size is 200 MB.
Is my audio file uploaded to a server?
No. The normalizer runs entirely in your browser using the Web Audio API. Your file never leaves your device — nothing is uploaded, stored, or analyzed.
What audio formats are supported?
MP3, WAV, M4A, FLAC, OGG, and AAC. Anything your browser can decode will load. The normalized output is exported as a 192 kbps MP3.