Loudness Normalization Preview
Calculate the constant gain needed for a target integrated loudness and constrain that gain using inter-sample peak headroom evidence before optionally rendering WAV.
Choose a mono or stereo browser-decodable audio file.
How planning works
The requested gain is target LUFS minus current integrated loudness. MesraTools then compares the predicted inter-sample peak against your ceiling and reduces the recommended static gain when necessary.
When the target cannot be reached
If the requested gain would exceed the peak ceiling, the report marks the target as not reachable by static gain alone. Build 122 does not automatically add limiting or compression to force the target.
WAV rendering
The optional render applies only the recommended constant gain and writes a new PCM WAV. It is not two-pass broadcast normalization or dynamic loudness processing.
Privacy
This Build 122 workflow decodes and analyzes audio locally in the browser; the selected file is not intentionally uploaded.
Standards and limitations
Integrated/window loudness uses the MesraTools BS.1770-style mono/stereo foundation. Peak planning uses the Build 121 4× inter-sample peak estimate. These tools are analytical planning aids, not certified broadcast meters, official dBTP/LRA instruments, limiters, or delivery-compliance certificates.