Bring a video's audio track to a consistent loudness (EBU R128) - the picture stays completely untouched. Locally, no upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
An interview where one person noticeably speaks quieter than another, several stitched-together clips at different recording volumes, or a video export that sounds too quiet or too loud on a streaming platform compared to everything else - this tool brings a video's audio track to a consistent, perceived loudness using the EBU R128 standard.
Important and honest: the picture is NEVER decoded or re-encoded - ffmpeg copies the video stream unchanged (`-c:v copy`), so there is no quality loss on the video and no GPL video encoder is invoked at all. Only the audio track runs through the proven EBU R128 single-pass filter (the very same one the sibling tool "Normalize audio" already uses) and is re-encoded as AAC (for MP4/MOV) or Opus (for WebM/MKV).
The process runs entirely locally in the browser via ffmpeg.wasm - your video is not uploaded.
| Input formats | MP4, M4V, MOV, MKV, WEBM |
|---|---|
| Auto-conversion | PNG, GIF |
| Output format | MP4 |
| Batch processing | No |
| Processing | Locally in your browser (WebAssembly) |
| File upload | None |
Limitations: Needs an existing audio track - without sound, the tool honestly reports that instead of producing an unchanged copy. The single-pass filter is somewhat less precise than a two-stage measure-then-normalize process, but needs no second decode pass in exchange. The picture always stays unchanged. One file per run, ~500 MB limit in memory mode (more with browser streaming support).
No, everything runs locally in the browser.
No. The video stream is copied byte-for-byte, never decoded or re-encoded.
-16 LUFS suits most podcasts and web videos, -14 LUFS matches common streaming platforms, -23 LUFS is the classic broadcast standard.
Yes, the sibling tool "Normalize audio" uses the same loudness filter for MP3, WAV and friends.
Mirror video · Change video resolution · Strip video metadata · Cut video silence · Extract subtitles