Even out the loudness of one or several audio files locally to a target loudness (LUFS) - no upload.
Running locally on your device ...
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
Some recordings sound quiet, others clip loud - especially noticeable when several clips (e.g. podcast episodes or music tracks) play back to back. This tool evens out loudness locally to a chosen target in LUFS (EBU R128, the same standard streaming platforms and broadcasters themselves use).
Three targets are offered: -14 LUFS (streaming-typical for Spotify/YouTube), -16 LUFS (common podcast standard) and -23 LUFS (EBU R128 broadcast norm, quieter with more dynamic headroom). The output format is freely selectable, same as the audio converter.
Normalization runs as a single-pass filter (ffmpeg loudnorm) directly in the browser - no upload, no second measurement pass. That is slightly less precise than a two-pass approach (which fully measures the file before adjusting), but faster and without a duplicate decode pass.
| Input formats | MP3, WAV, M4A, AAC, OGG, FLAC |
|---|---|
| Auto-conversion | MP4 |
| Output formats | MP3, WAV, M4A, FLAC, AAC, OGG |
| Batch processing | Yes |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: Single-pass normalization (no two-pass measurement run) - on very erratic material (e.g. abrupt volume jumps) less precise than a studio two-pass tool, but accurate enough for most recordings. When normalizing several files in one run, the same target applies to EVERY file in the batch. If a single file fails (e.g. no audio track), the rest are still normalized; the failed file shows up as a short error text file in the result.
| Target | Platform/use | Standard |
|---|---|---|
| -14 LUFS | streaming (Spotify, YouTube) | - |
| -16 LUFS | podcast | - |
| -23 LUFS | broadcast | EBU R128 |
No, everything stays local in the browser.
Loudness Units Full Scale - the standard EBU R128 loudness measure that streaming platforms and broadcasters use for levelling.
-14 LUFS for streaming/music, -16 LUFS for podcasts, -23 LUFS for broadcast requirements.
No. A simple volume knob shifts everything equally; loudnorm measures perceived loudness and adjusts specifically toward it.
Yes. Drop several audio files into the batch; all of them are normalized to the same target and, with more than one file, downloaded as a ZIP.
Yes, in the mobile browser just like on desktop - only with very long files in a batch can a smartphone's limited memory hit a wall sooner.
Both are good cloud tools, but they upload your audio file to a server for it. This normalization computes directly in the browser - no upload, no account, no queue.
Audio converter · MP4 to MP3 · Convert video · Fade audio in/out · Remove silence