Fade in. Fade out. Smooth the start and end of any song or recording, free, in your browser.

Questions

Which curve should I use?

Smooth (S-curve) suits most music: it eases in and out at both ends. Slow start sounds most gradual on a fade-out because hearing is roughly logarithmic; linear can sound like it drops off suddenly at the end.

How long should a fade-out be?

Song endings commonly fade over 5 to 15 seconds; a podcast intro or a clip for social media usually needs 1 to 3. Very short fades (under 50 ms) are just for removing clicks.

Can I cut the file first?

Yes. The free Audio Trimmer cuts a section out and adds fades in one go; use this tool when you want to keep the whole file.

Is it free, and is my audio uploaded?

Free, with no sign-up. The file is processed inside your browser and never leaves your device.