Millisecond-accurate afade curves plus an optional dB gain trim.

How to use

1. Load audio → the status line shows its length.
2. Set fade-in / fade-out ms and optional gain.
3. Apply → download the MP3.

About this tool

Podcast intros, mixtape transitions, ringtones that do not end with a click — fades are the finishing touch. Set your fade-in and fade-out in milliseconds and this tool applies FFmpeg's afade curves at the exact right spots: it reads the track's duration on-device first, so the fade-out starts precisely where the song ends, not roughly. An optional gain control (−12 to +12 dB) boosts or trims overall level in the same pass. Everything runs locally through the ~30 MB WebAssembly engine. Your file never leaves this page — processing runs in your browser via WebAssembly; nothing is uploaded and the file is dropped from memory when you close the tab.

FAQ

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