Fade In & Out
Add smooth fade-ins and fade-outs to any audio file.
End a Track Gently Instead of Abruptly
A clip cut from the middle of a song starts with a jolt and ends with a click. Set how long the fade-in and fade-out should be, pick the curve, and the waveform shows the envelope over your audio so you can see where it starts to dip. Use it for ringtones, background music under a video, podcast intros and outros, or samples for a presentation.
The curve matters: an equal-power fade sounds natural for music because perceived loudness drops evenly, a linear fade suits speech, an exponential fade lingers before dropping away, and a logarithmic one drops quickly then trails off. Fades are applied sample by sample, so there is never a click at either end.
Key features
- Separate fade-in and fade-out, each up to 30 seconds.
- Five curve shapes — equal power, linear, exponential, logarithmic and S-curve.
- Envelope drawn on the waveform, so you see exactly where the level changes.
- Instant preview after every change.
- WAV output ready for editors, phones and video apps.
This tool does its work inside your browser using native Web APIs. The files and text you give it are processed on your device and are not uploaded to our servers.
How to use: Fade In & Out
- Open the audio
Drop an MP3, WAV, M4A or OGG file onto the box. - Set the lengths
Drag the fade-in and fade-out sliders; the badge shows the seconds. - Choose a curve
Equal power for music, linear for speech — or try the others and listen. - Download
Press Download WAV once it sounds right.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Audio |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Which fade curve should I use?
Equal power for music — it keeps the fade sounding even. Linear is fine for speech. Exponential feels like a slow fade that suddenly finishes; logarithmic drops quickly and trails off.
How long should a fade-out be?
Two to five seconds for a song ending, half a second to a second to smooth a cut, and eight seconds or more for background music ending under a video.
Can I trim the audio first?
Yes — cut the part you want with the Audio Cutter, then bring the WAV here to add the fades.
Does it re-encode the audio?
The result is saved as uncompressed WAV, so the only change is the fade itself.