Shift every cue in a SubRip (.srt) or WebVTT (.vtt) caption file by one fixed offset, so a track that runs early or late lines up with the audio again. A positive offset delays the captions (they appear later); a negative one advances them. The output keeps the input format, cue text, order and WebVTT cue settings. A cue whose start would go below zero is held at zero and counted; a cue that would end before zero is dropped and counted. Timing only: nothing is stretched, translated or edited.
This page documents the HTTP endpoint POST /api/tools/subtitle-shift/execute. See the MCP reference →
Call it over REST
POST https://api.findutils.com/api/tools/subtitle-shift/execute · no API keys · 60 requests/min per IP
Execute — verified arguments
curl -X POST https://api.findutils.com/api/tools/subtitle-shift/execute \
-H "Content-Type: application/json" \
-d '{
"input": "1\n00:00:10,000 --> 00:00:12,000\nTen seconds in.\n",
"offset_ms": 1500
}'Parameter schema for this endpoint
curl https://api.findutils.com/api/tools/subtitle-shiftInput schema
| Argument | Type | Required | Description |
|---|---|---|---|
| input | string | yes | Caption file contents, either SubRip or WebVTT. |
| offset_ms | integer | yes | Milliseconds to add to every timestamp. Positive shows captions later, negative earlier. 1500 means one and a half seconds later. |
Example arguments (verified)
{
"input": "1\n00:00:10,000 --> 00:00:12,000\nTen seconds in.\n",
"offset_ms": 1500
}Also an MCP tool
Claude, Cursor, and any MCP client can call this tool as
findutils:subtitle_shift after one connect command.
Connect once
claude mcp add findutils --transport http https://mcp.findutils.com/More Developer tools
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