Animated word-by-word captions for your videos, on your computer or your own OpenCaptions server
Connect Runs on your machine
claude mcp add opencaptions -e OPENCAPTIONS_KEY=<OPENCAPTIONS_KEY> -e OPENCAPTIONS_URL=<OPENCAPTIONS_URL> -- npx -y [email protected]
{
"mcpServers": {
"opencaptions": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"OPENCAPTIONS_KEY": "<OPENCAPTIONS_KEY>",
"OPENCAPTIONS_URL": "<OPENCAPTIONS_URL>"
}
}
}
}
{
"mcpServers": {
"opencaptions": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"OPENCAPTIONS_KEY": "<OPENCAPTIONS_KEY>",
"OPENCAPTIONS_URL": "<OPENCAPTIONS_URL>"
}
}
}
}
{
"servers": {
"opencaptions": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"OPENCAPTIONS_KEY": "<OPENCAPTIONS_KEY>",
"OPENCAPTIONS_URL": "<OPENCAPTIONS_URL>"
}
}
}
}
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
OPENCAPTIONS_KEYOptional, secret | An API key from your OpenCaptions server's Account page, to caption there. Without it the package captions on this computer, with FFmpeg. |
OPENCAPTIONS_URLOptional | Your OpenCaptions server's web address (http://localhost:5173 when only the key is set) |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 12 Nov 2026 |
| Last updated | 12 Nov 2026 |
| Registry name | io.github.leogaudin/opencaptions |
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