{ "title": "Subtitle translator", "human_url": "https://happytails.ai/en/subtitle-tools/subtitle-translator/", "agent_url": "https://happytails.ai/agents/en/subtitle-tools/subtitle-translator/", "language": "en", "markdown_url": "https://happytails.ai/en/subtitle-tools/subtitle-translator.md", "content": "Subtitle translator\nTranslate subtitle text while preserving cue timing.\nUseful next steps\nSubtitle alignment\nAlign a matching English transcript to recorded speech.\nSubtitle editor\nCue text/timing editing, validation and export without automatic transcription.\nText to speech\nRead text aloud with a browser voice.\nHow to use Subtitle translator\nChoose a file in SRT or VTT.\nReview the settings, then choose Run Subtitle translator.\nReview the result, then use Copy result or a download link when available.\nWhat to expect\nTranslate subtitle text while preserving cue timing. Runs with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.", "content_format": "text/plain", "visibility": "public", "links": [ { "name": "Subtitle alignment Align a matching English transcript to recorded speech.", "url": "https://happytails.ai/en/subtitle-tools/subtitle-alignment/" }, { "name": "Subtitle editor Cue text/timing editing, validation and export without automatic transcription.", "url": "https://happytails.ai/en/subtitle-tools/subtitle-editor/" }, { "name": "Text to speech Read text aloud with a browser voice.", "url": "https://happytails.ai/en/speech-tools/text-to-speech/" } ], "tool": { "id": "subtitle-translator", "category": "subtitle-tools", "built": true, "requirements": "Translate existing SRT or VTT while preserving cue IDs and timings; review line wrapping, reading speed and terminology; retain original alongside translation.", "implementation": { "fields": [ { "key": "language", "label": "Translate to", "type": "select", "value": "English", "values": [ "English", "Spanish", "French", "German", "Portuguese" ] } ], "files": true, "accept": ".srt,.vtt", "multiple": false, "input": false, "processing": "Server required", "native": true, "ai": true, "maxFileBytes": 20971520, "note": "Runs with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.", "experience": { "automatic": false, "single": false, "label": "Your text", "placeholder": "Type or paste your input…", "help": "Up to 1,000,000 characters. Review the settings before running.", "action": null }, "mode": "explicit", "interactive": false }, "execution": "POST /api/v1/tools/subtitle-translator/run", "api": { "id": "subtitle-translator", "name": "Subtitle translator", "category": "subtitle-tools", "description": "Translate subtitle text while preserving cue timing.", "notes": "Runs with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.", "human_path": "/en/subtitle-tools/subtitle-translator/", "method": "POST", "endpoint": "/api/v1/tools/subtitle-translator/run", "schema_url": "/api/v1/tools/subtitle-translator", "input_schema": { "type": "object", "additionalProperties": false, "properties": { "input": { "type": "string", "maxLength": 1000000, "default": "", "description": "Plain text input. File tools use files instead unless otherwise documented." }, "options": { "type": "object", "additionalProperties": false, "properties": { "language": { "type": "string", "description": "Translate to", "default": "English", "enum": [ "English", "Spanish", "French", "German", "Portuguese" ] } } }, "files": { "type": "array", "maxItems": 1, "items": { "type": "object", "required": [ "name", "base64" ], "additionalProperties": false, "properties": { "name": { "type": "string", "maxLength": 200, "description": "Filename only, no path." }, "mime": { "type": "string", "maxLength": 150 }, "bytes": { "type": "integer", "minimum": 0, "description": "Optional decoded byte count; must match content if supplied." }, "base64": { "type": "string", "contentEncoding": "base64", "description": "File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size." } } } } } }, "output_schema": { "type": "object", "required": [ "tool", "result" ], "properties": { "tool": { "type": "string" }, "result": { "type": "object", "required": [ "text", "files" ], "properties": { "text": { "type": [ "string", "null" ] }, "data": { "description": "Parsed JSON when the textual result is JSON." }, "name": { "type": "string" }, "mime": { "type": "string" }, "files": { "type": "array", "items": { "type": "object", "required": [ "name", "mime", "bytes", "base64" ], "properties": { "name": { "type": "string" }, "mime": { "type": "string" }, "bytes": { "type": "integer" }, "base64": { "type": "string", "contentEncoding": "base64" } } } } } } } }, "processing": "Server; self-hosted native engine, no external conversion service", "limits": { "request_bytes": 31457280, "input_characters": 1000000, "files_bytes": 20971520, "max_files": 1, "timeout_seconds": 90 } }, "agent_processing": "Server; self-hosted native engine, no external conversion service", "browser_agent": { "supported": true, "name": "run_current_tool", "discovery": "WebMCP on the human page in a supporting browser", "verification": "See audit/API-AUDIT.md; availability is not verification" } }, "markdown": "# Subtitle translator\n\n- Human page: https://happytails.ai/en/subtitle-tools/subtitle-translator/\n- Markdown: https://happytails.ai/en/subtitle-tools/subtitle-translator.md\n- Structured JSON: https://happytails.ai/agents/en/subtitle-tools/subtitle-translator/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `subtitle-translator` |\n| Category | subtitle-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Use the visible action or interactive controls. |\n| Browser processing | Server required |\n| HTTP API | /api/v1/tools/subtitle-translator/run |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nRuns with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.\n\n### Inputs and settings\n\nNo free-text input is required. Use the file inputs and/or settings below.\n\nAccepted browser files: `.srt,.vtt`. Choose one file.\n\nBrowser file-input limit: 20971520 bytes in total. HTTP limits can differ.\n\n| Setting | Meaning | Control type | Default | Constraints |\n| --- | --- | --- | --- | --- |\n| `language` | Translate to | select | \"English\" | Allowed: English, Spanish, French, German, Portuguese |\n\n### HTTP contract\n\nAPI calls process supplied data on the server. The website origin is `https://happytails.ai`. Server API hosting is not connected on the public website yet. Use your local server origin to test these requests.\n\n```http\nPOST https://happytails.ai/api/v1/tools/subtitle-translator/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/subtitle-translator.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 31457280 |\n| input_characters | 1000000 |\n| files_bytes | 20971520 |\n| max_files | 1 |\n| timeout_seconds | 90 |\n\n#### Complete input schema\n\n```json\n{\n \"type\": \"object\",\n \"additionalProperties\": false,\n \"properties\": {\n \"input\": {\n \"type\": \"string\",\n \"maxLength\": 1000000,\n \"default\": \"\",\n \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n },\n \"options\": {\n \"type\": \"object\",\n \"additionalProperties\": false,\n \"properties\": {\n \"language\": {\n \"type\": \"string\",\n \"description\": \"Translate to\",\n \"default\": \"English\",\n \"enum\": [\n \"English\",\n \"Spanish\",\n \"French\",\n \"German\",\n \"Portuguese\"\n ]\n }\n }\n },\n \"files\": {\n \"type\": \"array\",\n \"maxItems\": 1,\n \"items\": {\n \"type\": \"object\",\n \"required\": [\n \"name\",\n \"base64\"\n ],\n \"additionalProperties\": false,\n \"properties\": {\n \"name\": {\n \"type\": \"string\",\n \"maxLength\": 200,\n \"description\": \"Filename only, no path.\"\n },\n \"mime\": {\n \"type\": \"string\",\n \"maxLength\": 150\n },\n \"bytes\": {\n \"type\": \"integer\",\n \"minimum\": 0,\n \"description\": \"Optional decoded byte count; must match content if supplied.\"\n },\n \"base64\": {\n \"type\": \"string\",\n \"contentEncoding\": \"base64\",\n \"description\": \"File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size.\"\n }\n }\n }\n }\n }\n}\n```\n\n#### Complete output schema\n\n```json\n{\n \"type\": \"object\",\n \"required\": [\n \"tool\",\n \"result\"\n ],\n \"properties\": {\n \"tool\": {\n \"type\": \"string\"\n },\n \"result\": {\n \"type\": \"object\",\n \"required\": [\n \"text\",\n \"files\"\n ],\n \"properties\": {\n \"text\": {\n \"type\": [\n \"string\",\n \"null\"\n ]\n },\n \"data\": {\n \"description\": \"Parsed JSON when the textual result is JSON.\"\n },\n \"name\": {\n \"type\": \"string\"\n },\n \"mime\": {\n \"type\": \"string\"\n },\n \"files\": {\n \"type\": \"array\",\n \"items\": {\n \"type\": \"object\",\n \"required\": [\n \"name\",\n \"mime\",\n \"bytes\",\n \"base64\"\n ],\n \"properties\": {\n \"name\": {\n \"type\": \"string\"\n },\n \"mime\": {\n \"type\": \"string\"\n },\n \"bytes\": {\n \"type\": \"integer\"\n },\n \"base64\": {\n \"type\": \"string\",\n \"contentEncoding\": \"base64\"\n }\n }\n }\n }\n }\n }\n }\n}\n```\n\n#### Error and retry handling\n\nFailures return a non-200 status and `error.code` plus `error.message`. Correct invalid input before retrying; retry server-busy responses with bounded backoff. Returned files contain Base64 data, not persistent download URLs. Decode and inspect the output before treating conversion as successful. See the shared API guide for the complete status and timeout rules.\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nTranslate existing SRT or VTT while preserving cue IDs and timings; review line wrapping, reading speed and terminology; retain original alongside translation.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n \"id\": \"subtitle-translator\",\n \"category\": \"subtitle-tools\",\n \"built\": true,\n \"requirements\": \"Translate existing SRT or VTT while preserving cue IDs and timings; review line wrapping, reading speed and terminology; retain original alongside translation.\",\n \"implementation\": {\n \"fields\": [\n {\n \"key\": \"language\",\n \"label\": \"Translate to\",\n \"type\": \"select\",\n \"value\": \"English\",\n \"values\": [\n \"English\",\n \"Spanish\",\n \"French\",\n \"German\",\n \"Portuguese\"\n ]\n }\n ],\n \"files\": true,\n \"accept\": \".srt,.vtt\",\n \"multiple\": false,\n \"input\": false,\n \"processing\": \"Server required\",\n \"native\": true,\n \"ai\": true,\n \"maxFileBytes\": 20971520,\n \"note\": \"Runs with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.\",\n \"experience\": {\n \"automatic\": false,\n \"single\": false,\n \"label\": \"Your text\",\n \"placeholder\": \"Type or paste your input…\",\n \"help\": \"Up to 1,000,000 characters. Review the settings before running.\",\n \"action\": null\n },\n \"mode\": \"explicit\",\n \"interactive\": false\n },\n \"execution\": \"POST /api/v1/tools/subtitle-translator/run\",\n \"api\": {\n \"id\": \"subtitle-translator\",\n \"name\": \"Subtitle translator\",\n \"category\": \"subtitle-tools\",\n \"description\": \"Translate subtitle text while preserving cue timing.\",\n \"notes\": \"Runs with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.\",\n \"human_path\": \"/en/subtitle-tools/subtitle-translator/\",\n \"method\": \"POST\",\n \"endpoint\": \"/api/v1/tools/subtitle-translator/run\",\n \"schema_url\": \"/api/v1/tools/subtitle-translator\",\n \"input_schema\": {\n \"type\": \"object\",\n \"additionalProperties\": false,\n \"properties\": {\n \"input\": {\n \"type\": \"string\",\n \"maxLength\": 1000000,\n \"default\": \"\",\n \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n },\n \"options\": {\n \"type\": \"object\",\n \"additionalProperties\": false,\n \"properties\": {\n \"language\": {\n \"type\": \"string\",\n \"description\": \"Translate to\",\n \"default\": \"English\",\n \"enum\": [\n \"English\",\n \"Spanish\",\n \"French\",\n \"German\",\n \"Portuguese\"\n ]\n }\n }\n },\n \"files\": {\n \"type\": \"array\",\n \"maxItems\": 1,\n \"items\": {\n \"type\": \"object\",\n \"required\": [\n \"name\",\n \"base64\"\n ],\n \"additionalProperties\": false,\n \"properties\": {\n \"name\": {\n \"type\": \"string\",\n \"maxLength\": 200,\n \"description\": \"Filename only, no path.\"\n },\n \"mime\": {\n \"type\": \"string\",\n \"maxLength\": 150\n },\n \"bytes\": {\n \"type\": \"integer\",\n \"minimum\": 0,\n \"description\": \"Optional decoded byte count; must match content if supplied.\"\n },\n \"base64\": {\n \"type\": \"string\",\n \"contentEncoding\": \"base64\",\n \"description\": \"File bytes as padded base64. Use the tool-specific limits.files_bytes value for the total decoded input size.\"\n }\n }\n }\n }\n }\n },\n \"output_schema\": {\n \"type\": \"object\",\n \"required\": [\n \"tool\",\n \"result\"\n ],\n \"properties\": {\n \"tool\": {\n \"type\": \"string\"\n },\n \"result\": {\n \"type\": \"object\",\n \"required\": [\n \"text\",\n \"files\"\n ],\n \"properties\": {\n \"text\": {\n \"type\": [\n \"string\",\n \"null\"\n ]\n },\n \"data\": {\n \"description\": \"Parsed JSON when the textual result is JSON.\"\n },\n \"name\": {\n \"type\": \"string\"\n },\n \"mime\": {\n \"type\": \"string\"\n },\n \"files\": {\n \"type\": \"array\",\n \"items\": {\n \"type\": \"object\",\n \"required\": [\n \"name\",\n \"mime\",\n \"bytes\",\n \"base64\"\n ],\n \"properties\": {\n \"name\": {\n \"type\": \"string\"\n },\n \"mime\": {\n \"type\": \"string\"\n },\n \"bytes\": {\n \"type\": \"integer\"\n },\n \"base64\": {\n \"type\": \"string\",\n \"contentEncoding\": \"base64\"\n }\n }\n }\n }\n }\n }\n }\n },\n \"processing\": \"Server; self-hosted native engine, no external conversion service\",\n \"limits\": {\n \"request_bytes\": 31457280,\n \"input_characters\": 1000000,\n \"files_bytes\": 20971520,\n \"max_files\": 1,\n \"timeout_seconds\": 90\n }\n },\n \"agent_processing\": \"Server; self-hosted native engine, no external conversion service\",\n \"browser_agent\": {\n \"supported\": true,\n \"name\": \"run_current_tool\",\n \"discovery\": \"WebMCP on the human page in a supporting browser\",\n \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n }\n}\n```\n\n## Page guide\n\nTranslate subtitle text while preserving cue timing.\n\n## Useful next steps\n\n- [Subtitle alignment](https://happytails.ai/en/subtitle-tools/subtitle-alignment/): Align a matching English transcript to recorded speech. ([Markdown](https://happytails.ai/en/subtitle-tools/subtitle-alignment.md))\n\n- [Subtitle editor](https://happytails.ai/en/subtitle-tools/subtitle-editor/): Cue text/timing editing, validation and export without automatic transcription. ([Markdown](https://happytails.ai/en/subtitle-tools/subtitle-editor.md))\n\n- [Text to speech](https://happytails.ai/en/speech-tools/text-to-speech/): Read text aloud with a browser voice. ([Markdown](https://happytails.ai/en/speech-tools/text-to-speech.md))\n\n## How to use Subtitle translator\n\n1. Choose a file in SRT or VTT.\n2. Review the settings, then choose Run Subtitle translator.\n3. Review the result, then use Copy result or a download link when available.\n\n## What to expect\n\nTranslate subtitle text while preserving cue timing. Runs with local model weights on this website’s server. No external AI API is used. Review the result for errors. Preserves cue timestamps. Up to 50 cues. Review translation and reading speed.\n" }