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SnapOtter/apps/docs/tools/audio/fade-audio.md
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---
description: Add fade-in and fade-out effects to audio.
---
# Fade Audio
Add fade-in and fade-out effects to the beginning and end of an audio file.
## API Endpoint
`POST /api/v1/tools/audio/fade-audio`
Accepts multipart form data with an audio file and a JSON `settings` field.
## Parameters
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| fadeInS | number | No | `1` | Fade-in duration in seconds (0 to 30) |
| fadeOutS | number | No | `1` | Fade-out duration in seconds (0 to 30) |
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/audio/fade-audio \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@audio.mp3" \
-F 'settings={"fadeInS": 2, "fadeOutS": 3}'
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/audio.mp3",
"originalSize": 4500000,
"processedSize": 4500000
}
```
## Notes
- Set either value to `0` to skip that fade direction.
- The fade duration should not exceed the audio length.
- Output format matches the input format.