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SnapOtter/apps/docs/tools/video/replace-audio.md
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SnapOtter 8532f3227b docs: audit all 157 tool pages against live schemas
Reconcile every tool page's parameters, defaults, and response shape against the tool's Zod settings schema and executionHint in code. Notable fixes: color-palette (add count + format params, hex output, median-cut algorithm), favicon (add 5 params, was documented as having none), qr-generate (add logoDataUri), convert (add ppm/eps/tga formats), video-loudnorm (-16 LUFS not -14), smart-crop (async 202 not sync 200), images-to-video (1080x1080 square), and several output-filename and behavior-note corrections.

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---
description: Swap the audio track of a video with another file.
---
# Replace Audio
Swap the audio track of a video with an audio file. Upload both a video and an audio file.
## API Endpoint
`POST /api/v1/tools/replace-audio`
Accepts multipart form data with exactly two files: a video file followed by an audio file.
## Parameters
This tool has no settings parameters. Upload a video file and an audio file as two `file` parts.
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/replace-audio \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@clip.mp4" \
-F "file=@voiceover.mp3"
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/clip.mp4",
"originalSize": 12500000,
"processedSize": 13100000
}
```
## Notes
- Exactly two files must be uploaded: the first must be a video, the second must be an audio file.
- If the audio file is longer than the video, it is trimmed to match the video duration. If shorter, the remaining video plays in silence.
- The video stream is copied without re-encoding, so there is no video quality loss.