A linear fade reduces amplitude proportionally over time — simple, but can sound abrupt at the midpoint. Equal-power uses a sinusoidal curve that maintains a more constant perceived volume, ideal for professional mixdowns and crossfades.
Audio Fade In/Out
Apply fade in and fade out to audio files with linear or equal-power curves — 100% in browser.
Professional fade in and fade out without installing anything
The Audio Fade In/Out tool applies smooth volume transitions at the beginning and end of any audio file. Choose between equal-power curve (used in professional mixing) and linear curve. Processing uses the Web Audio API and happens 100% on your device.
Three steps to apply fade
- Open or drag an audio file (MP3, WAV, OGG, FLAC, AAC, or M4A).
- Adjust the Fade In and Fade Out durations using the sliders and choose the desired curve.
- Click "Download audio with fade" to save the result in WAV format.
Sources and references for this tool
These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
- AudioBuffer — Web APIsMDN Web Docs — Interface representing a decoded audio buffer in memory — foundation for sample manipulation.
- Equal-Power Crossfading — Web Audio API Best PracticesMDN Web Docs — Equal-power crossfade technique that maintains constant power during transitions.
- GainNode — Web APIsMDN Web Docs — Web Audio API gain node — reference for volume automation over time.