Audio Fade In / Out
Add a smooth fade-in at the start and a fade-out at the end of any track — set each length in seconds, pick a curve.
How to Fade Audio In and Out in 3 Steps
Drop an audio file
Drag any MP3, WAV, M4A, OGG or FLAC onto the left pane. The waveform and a player appear.
Set the fades
Open Settings and choose how many seconds the fade-in and fade-out should last (0 disables one). Smooth is right for music; Exponential mimics a natural decay for sound effects.
Apply and download
Click Apply fades. The output waveform shows the tapered ends and the result plays on the right.
Audio Fade In / Out — Frequently Asked Questions
Is my audio uploaded anywhere?
No. The file is decoded by your browser's Web Audio engine, processed on your device and encoded to MP3 or WAV with an open-source encoder running in the page. Nothing is sent to a server.
Which curve should I use?
Smooth (equal-power S-curve) is the usual choice for music — it sounds even to the ear. Linear is a straight ramp and can feel abrupt at the end. Exponential drops quickly then trails off, like a real sound dying away.
Can I fade only the start or only the end?
Yes — set the other slider to 0 seconds. If a fade is longer than the file, it is shortened to the file length automatically.
Which formats can I open and save?
Open anything your browser plays: MP3, WAV, M4A/AAC, OGG, Opus, FLAC and WebM audio. Save as MP3 (128, 192 or 320 kbps) or lossless 16-bit WAV. Pick the format under Settings before you run the tool.
Does it lose quality?
Decoding to raw samples is lossless; the only loss is the final MP3 encode, and 192–320 kbps is transparent for most listeners. Choose WAV if you plan to edit the result again — re-encoding MP3 twice stacks artefacts.