Loudness Meter & Normalizer (LUFS, Free)
Measure how loud your audio really is (integrated LUFS, LRA and true peak) and match it to the target of YouTube, Spotify, podcasts or broadcast. Nothing is uploaded.
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- Only upload files you have the right to use. Copying or sharing other people's music, videos or recordings without permission can violate copyright law. FreeSoundTools does not store your files on a server.
Measure how loud your audio really is (integrated LUFS, LRA and true peak) and match it to the target of YouTube, Spotify, podcasts or broadcast. Nothing is uploaded.
When to use it
- Make a podcast episode match the -16 LUFS podcast norm
- Prepare music or narration for YouTube and Spotify (-14 LUFS)
- Deliver audio that meets the EBU R128 broadcast target (-23 LUFS)
- Make several recordings play at the same perceived volume
How to use
- Drop an audio file. The integrated loudness, LRA, true peak and sample peak are measured right away.
- Pick a target (-14, -16, -19, -23 LUFS or your own value) and a true-peak ceiling.
- Press "Match to this target" and compare the original and the result.
- Save as WAV, FLAC, MP3 or M4A.
Supported formats and limits
- Measurement follows ITU-R BS.1770-4 (K-weighting, gating); LRA follows EBU Tech 3342
- True peak is an approximation using 4x oversampling
- Output: WAV, FLAC, MP3 320/192 kbps, M4A (AAC, where the browser supports it)
Tips for better results
- If the result ends a little below the target, the peak limiter kept the true peak under your ceiling. Raise the ceiling slightly to get closer.
- Streaming services turn loud tracks down, so mastering louder than their target does not make you louder there.
- Very short clips (under 3 seconds) do not have a loudness range value.
FAQ
What is LUFS?
Loudness Units relative to Full Scale, a measure of perceived loudness used by streaming services and broadcasters.
Which target should I use?
-14 LUFS for YouTube and Spotify, -16 LUFS for podcasts and Apple, -23 LUFS for EBU R128 broadcast.
Is my file uploaded?
No. Measurement and processing happen in your browser.
Why does the result say it ended below the target?
The limiter keeps the true peak under the ceiling you chose. If the material is very peaky, it cannot reach the target without exceeding that ceiling.
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