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SnapOtter/apps/docs/tools/audio/merge-audio.md
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---
description: Combine multiple audio files into one sequential track.
---
# Merge Audio
Combine two or more audio files into a single sequential track, concatenated in the order they are uploaded.
## API Endpoint
`POST /api/v1/tools/audio/merge-audio`
Accepts multipart form data with multiple audio files and a JSON `settings` field.
## Parameters
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| format | string | No | `"mp3"` | Output format: `mp3`, `wav`, `flac`, `m4a` |
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/audio/merge-audio \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@intro.mp3" \
-F "file=@main.mp3" \
-F "file=@outro.mp3" \
-F 'settings={"format": "mp3"}'
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/merged.mp3",
"originalSize": 9500000,
"processedSize": 9200000
}
```
## Notes
- Accepts 2 to 10 audio files per request.
- Files are concatenated in upload order.
- All input files are re-encoded to the chosen output format and sample rate for seamless joining.
- Mixed input formats are supported (e.g. one WAV and one MP3).