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SnapOtter/apps/docs/tools/video/burn-subtitles.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.

Also normalize API endpoint paths to /api/v1/tools/<id> (no modality segment) and standardize curl examples on the Docker API port 1349. Verified with a clean docs build.
2026-06-18 14:12:28 +08:00

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---
description: Permanently render subtitles onto video frames.
---
# Burn Subtitles
Permanently render (hard-code) subtitles from an SRT, VTT, or ASS file onto every frame of a video.
## API Endpoint
`POST /api/v1/tools/burn-subtitles`
Accepts multipart form data with a video file and a subtitle file. This is an async endpoint - it returns `202 Accepted` immediately and progress is streamed via SSE at `GET /api/v1/jobs/{jobId}/progress`.
## Parameters
| Parameter | Type | Required | Default | Description |
|-----------|------|----------|---------|-------------|
| fontSize | integer | No | `24` | Subtitle font size in pixels (8-72) |
## Example Request
```bash
curl -X POST http://localhost:1349/api/v1/tools/burn-subtitles \
-H "Authorization: Bearer si_your-api-key" \
-F "file=@clip.mp4" \
-F "file=@subtitles.srt" \
-F 'settings={"fontSize": 28}'
```
## Example Response
```json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"async": true
}
```
## Notes
- Upload two files: the first must be a video, the second must be a subtitle file (.srt, .vtt, or .ass).
- Burned subtitles are permanently part of the video and cannot be turned off by the viewer. For toggleable subtitles, use the Embed Subtitles tool instead.
- Progress updates are available via SSE at `GET /api/v1/jobs/{jobId}/progress` until the job completes.