Use this LUFS meter online free — no watermark, no sign-up, no install. Load a song, podcast episode or even a video, read its integrated loudness in LUFS, then normalize the audio to -14 LUFS for YouTube and Spotify, -16 LUFS for TikTok, Instagram and podcasts, or -23 LUFS for EBU R128 broadcast. Everything runs in your browser: your files never leave your device.
The measurement follows the ITU-R BS.1770 method used by streaming platforms — K-weighting, 400 ms blocks with 75% overlap and loudness gating — plus sample peak and a 4× oversampled true-peak estimate, so you know exactly how your track will be treated after upload.
Drop an audio or video file (MP3, WAV, M4A, OGG, FLAC, MP4). It is decoded and measured right in your browser.
Read the integrated LUFS, sample peak and true peak, and compare against YouTube, Spotify, TikTok, Podcast and broadcast targets.
Pick a target and a format, hit Normalize, and download the loudness-corrected WAV or MP3.
LUFS (Loudness Units relative to Full Scale) measures how loud audio actually sounds to human ears, not just how tall the waveform is. Streaming platforms turn tracks down (and sometimes up) to their own LUFS target — so mastering to the platform's level means your track plays back exactly as you mixed it, with no surprise volume drops.
Yes — completely free with no watermark, no sign-up and no usage limits. Measure loudness and normalize as many files as you like.
No. Decoding, LUFS measurement and normalization all run inside your browser. Your files never leave your device.
YouTube and Spotify normalize playback to around -14 LUFS. TikTok and Instagram sit closer to -16 LUFS, podcasts commonly target -16 LUFS, and EBU R128 broadcast uses -23 LUFS. Pick a platform preset and the tool applies the right gain.
With the ITU-R BS.1770 method: K-weighting filters, 400 ms blocks with 75% overlap, and -70 LUFS absolute plus -10 LU relative gating — the same approach streaming platforms use. True peak is estimated with 4x oversampling, so it is approximate.
If the required gain would push the estimated true peak above -1 dBTP, the tool automatically reduces the gain so the peak stays at about -1 dBTP and shows you the loudness that was actually reached — the output never clips.