Audio Fade In/Out
Add a smooth fade at the start and end of your audio. 100% in your browser, your audio is never uploaded anywhere.
Drag your audio here or click to select
MP3, WAV, OGG, FLAC, M4A, AAC · no artificial size limit
Built by
Miguel Ángel Colorado Marin (MACM)
Built by
Miguel Ángel Colorado Marin (MACM)
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
A fade in and fade out smooths the start and end of an audio file, avoiding the abrupt cut typical of a recording chopped with scissors. Upload your MP3, WAV, OGG, FLAC, M4A or AAC file, enable fade in, fade out or both, adjust how many seconds each one lasts, and download the result. Useful for music that cuts off abruptly, podcasts, social media clips or any recording that needs to start and end smoothly. All processing runs with FFmpeg compiled to WebAssembly inside your own browser — your file never leaves your device.
Features
- ✓MP3, WAV, OGG, FLAC, M4A, AAC
- ✓Independent fade in and fade out
- ✓Adjustable duration in seconds
- ✓Preview the result before downloading
- ✓100% in browser, no uploads
How to add a fade to an audio file?
- 1
Upload your audio
Drag the file or click to select it. Supports MP3, WAV, OGG, FLAC, M4A and AAC.
- 2
Enable the fades you need
Fade in, fade out, or both at once, each with its own toggle.
- 3
Adjust the duration
Move the slider to choose how many seconds each fade lasts.
- 4
Download the result
Listen to the result in the player and download it with one click.
Frequently asked questions
Is my audio uploaded to a server?
No. The fade is processed with FFmpeg compiled to WebAssembly inside your browser. The file never leaves your device.
Can I apply only fade in or only fade out?
Yes, each fade has its own independent toggle, you can enable one, the other, or both.
What formats does it support?
MP3, WAV, OGG, FLAC, M4A and AAC. The result downloads in the same format as the original file.
Is there a size limit?
There's no artificial limit, the only real limit is what your own device can process.
Related tools
Embed Audio Fade In/Out on your site
Add Audio Fade In/Out to any web page with a simple iframe. Free, with attribution to miguelacm.es.
<iframe
src="https://miguelacm.es/embed/audio-fade"
width="100%"
height="700"
frameborder="0"
title="Audio Fade In/Out — miguelacm.es"
></iframe>