Audio Fade In & Out
Add a fade in and a fade out to an audio file, pick the curve shape, and download the result as a WAV — all in your browser.
Drag & drop an audio file here, or click to browse
No uploads. Your audio stays on your device.
The blue line is the volume envelope: it ramps up at the start and down at the end.
How it works
Drop an MP3, WAV, M4A, OGG, FLAC or WebM file and it is decoded straight inside your browser tab with the Web Audio API — nothing is uploaded, so a podcast edit, a voice memo or an unreleased mix never leaves your device. Set how many seconds the fade in and the fade out should last and every sample is multiplied by a volume envelope that is drawn right on top of the waveform, so you can see exactly where the music starts swelling and where it dies away.
The curve changes how the volume travels between silence and full level. Linear is the plain straight ramp; Smooth eases in and out at both ends and is the most natural for music; Exponential stays quiet longer before rushing up, which suits dramatic intros; Logarithmic jumps up quickly and then levels off, good for trimming an abrupt start. The preview and the download update instantly, and the export is an uncompressed 16-bit WAV — a lossless render of the faded audio that any editor, phone or DAW will open.
Frequently asked questions
Is my audio uploaded to a server?
No. The file is decoded and re-rendered with the Web Audio API inside your browser tab, so it never leaves your device — no server, no account, no shareable link. That makes it safe for podcast edits, voice memos, client work and unreleased mixes.
Which fade curve should I use?
Linear is the plain straight ramp and works for speech. Smooth (S-curve) eases in and out at both ends and sounds the most natural on music. Exponential stays quiet longer before rushing up, which suits dramatic intros. Logarithmic rises fast then levels off, handy for softening an abrupt start.
What formats can I fade, and what do I get back?
Anything your browser can decode: MP3, WAV, M4A/AAC, OGG, Opus, FLAC and WebM all work in current Chrome, Edge, Firefox and Safari. The export is always an uncompressed 16-bit WAV — a lossless render of the faded audio that any editor, phone or DAW will open, with no re-compression artefacts.