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SnapOtter/apps/docs/tools/audio/volume-adjust.md
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SnapOtter d24e244af4 docs: organize tool pages by modality under /tools/<modality>/
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---
description: Increase or decrease audio volume by a fixed gain in decibels.
---
# Volume Adjust
Increase or decrease the volume of an audio file by applying a fixed gain in decibels.
## API Endpoint
`POST /api/v1/tools/audio/volume-adjust`
Accepts multipart form data with an audio file and a JSON `settings` field.
## Parameters
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| gainDb | number | No | `3` | Volume adjustment in decibels (-30 to 30) |
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/audio/volume-adjust \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@audio.mp3" \
-F 'settings={"gainDb": 6}'
```
## 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
- Positive values increase volume; negative values decrease it.
- Large positive gains can cause clipping. Use normalize-audio for loudness-safe leveling.
- Output format matches the input format.