Online Tool Store
Fade Editor
Add a smooth fade-in and fade-out to any audio track with adjustable durations, previewed and exported as a WAV file. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
WAV, MP3, or any format your browser can decode. Nothing is uploaded.
No audio yet - choose a file to add fade-in and fade-out.
How the fade editor works
- Choose an audio file and set the fade-in and fade-out durations.
- The tool decodes the audio into raw samples and applies a linear volume ramp at the start and end.
- The processed audio is rendered offline and exported as a downloadable WAV file.
The method
A Web Audio gain node's volume is scheduled with linear ramps: silent at time 0, full volume by the end of the fade-in, held steady, then ramped back to silent over the fade-out window - the same envelope shape a DAW's fade handles produce.
FAQ
What audio formats are supported?
Any format your browser can decode - MP3, WAV, and M4A/AAC are the most reliable across Chrome, Firefox, and Safari.
Why is the downloaded file always a WAV?
The fade is applied by rendering raw audio samples, which are then encoded as an uncompressed WAV file - a format the browser can build without needing an MP3 encoder library.
What kind of fade curve is used?
A linear fade - volume ramps evenly from silent to full volume (or vice versa) over the time you set, which is the most common and predictable fade shape.
What happens if fade in and fade out overlap?
If their combined length would exceed the track's total duration, the tool shows a warning and does not process the file - shorten one or both fades.
How we compare
| Feature | Online Tool Store | Audacity | Online audio editors |
|---|---|---|---|
| No software install | ✓ | ✗ | ✓ |
| No file upload - runs in your browser | ✓ | ✓ | ✗ |
| Free, no sign-up | ✓ | ✓ | Often paid |
For a quick, private fade without opening a full audio editor, Fade Editor gets the job done in a few clicks.