Fade In and Out
Add a smooth fade in at the start and a fade out at the end of audio or videos.
Free · No upload · 100% on your device
Fade In and Out
Choose video or audio files, or drop them here.
MP4, MOV, MKV, WebM, AVI and more · No size or length limit. Nothing is uploaded.
100% on your device
How to use Fade In and Out
- Choose your audio files, or drop them on the page.
- Pick the settings in the side panel.
- Select “Add fades”. The first use downloads the video engine once.
- Download the result. Your original file is left unchanged.
Private by design. Your files are processed in this browser tab and are never uploaded to KittySuite.
About Fade In and Out
Set either fade to 0 to leave that end unchanged. The fade out ends exactly at the end of the file. For videos, only the sound fades and the picture is copied unchanged.
Processing happens in this tab with FFmpeg compiled to WebAssembly; your recordings are never uploaded. The first video or audio tool you use downloads the 10 MB engine once and keeps it cached for next time. On phones, files are processed one at a time to stay within memory, and long recordings take a little longer. Keep the tab open until the download appears.
Fade In and Out: frequently asked questions
How do I add a fade out to a song?
Choose the file and set the fade-out length in seconds. The fade ends exactly at the end of the file.
Can I add only a fade in?
Yes. Set the other fade to 0 to leave that end unchanged.
Does it work on videos?
Yes. Only the sound fades; the picture is copied unchanged.
Can I fade many files at once?
Yes. Add a batch and the same fades are applied to each file.