# Srt To Vtt — REST API endpoint `srt-to-vtt`

Convert SubRip (.srt) captions to WebVTT (.vtt) and back. The direction is detected from the input by default: SRT uses a comma before the milliseconds, WebVTT uses a dot and starts with a WEBVTT header. Timestamps are normalized to HH:MM:SS with three fraction digits, VTT cue settings are preserved, and NOTE and STYLE blocks are skipped. Only the format changes; the caption text is never translated or edited.

- Category: media
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/srt-to-vtt/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/api/srt-to-vtt/
- Same tool on the other surface: https://findutils.com/mcp/srt-to-vtt/

## Call the endpoint (verified example)

```bash
curl -X POST https://api.findutils.com/api/tools/srt-to-vtt/execute \
  -H "Content-Type: application/json" \
  -d '{
    "input": "1\n00:00:01,000 --> 00:00:04,000\nHello there.\n"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/srt-to-vtt
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `input` | string | yes | Caption file contents, either SubRip or WebVTT. |
| `direction` | string (auto \| srt-to-vtt \| vtt-to-srt) | no | Force a direction. Default: auto, detected from the input. Default: `"auto"`. |
| `keep_cue_numbers` | boolean | no | Keep cue identifiers when writing WebVTT, where they are optional. Default: false. Default: `false`. |

Example arguments (verified):

```json
{
  "input": "1\n00:00:01,000 --> 00:00:04,000\nHello there.\n"
}
```

OpenAPI 3.1 spec: https://findutils.com/api/openapi.json · Interactive docs: https://findutils.com/api/docs/

## Also an MCP tool

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Then ask the client to call `findutils:srt_to_vtt`. Full MCP reference: https://findutils.com/mcp/srt-to-vtt/

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