{ "title": "Upscale image", "human_url": "https://happytails.ai/en/image-tools/upscale-image/", "agent_url": "https://happytails.ai/agents/en/image-tools/upscale-image/", "language": "en", "markdown_url": "https://happytails.ai/en/image-tools/upscale-image.md", "content": "Upscale image\nEnlarge an image with high-quality Lanczos resampling.\nUseful next steps\nRemove background\nRemove an image background and export a transparent PNG.\nPhoto denoiser\nReduce colour noise in a photo with adjustable strength.\nResize image\nResize an image to the dimensions you need.\nHow to use Upscale image\nChoose a file in PNG, JPEG or WEBP.\nReview the settings, then choose Run Upscale image.\nReview the result, then use Copy result or a download link when available.\nWhat to expect\nEnlarge an image with high-quality Lanczos resampling. Processed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.", "content_format": "text/plain", "visibility": "public", "links": [ { "name": "Remove background Remove an image background and export a transparent PNG.", "url": "https://happytails.ai/en/image-tools/remove-background/" }, { "name": "Photo denoiser Reduce colour noise in a photo with adjustable strength.", "url": "https://happytails.ai/en/image-tools/photo-denoiser/" }, { "name": "Resize image Resize an image to the dimensions you need.", "url": "https://happytails.ai/en/image-tools/resize-image/" } ], "tool": { "id": "upscale-image", "category": "image-tools", "built": true, "requirements": "Compare interpolation and model-based enhancement; no invented detail guarantees.", "implementation": { "fields": [ { "key": "scale", "label": "Scale factor", "value": "2", "type": "select", "values": [ "2", "4" ] } ], "files": true, "accept": ".png,.jpg,.jpeg,.webp", "multiple": false, "input": false, "processing": "Server required", "native": true, "extra": true, "maxFileBytes": 20971520, "note": "Processed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.", "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/upscale-image/run", "api": { "id": "upscale-image", "name": "Upscale image", "category": "image-tools", "description": "Enlarge an image with high-quality Lanczos resampling.", "notes": "Processed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.", "human_path": "/en/image-tools/upscale-image/", "method": "POST", "endpoint": "/api/v1/tools/upscale-image/run", "schema_url": "/api/v1/tools/upscale-image", "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": { "scale": { "type": "string", "description": "Scale factor", "default": "2", "enum": [ "2", "4" ] } } }, "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": "# Upscale image\n\n- Human page: https://happytails.ai/en/image-tools/upscale-image/\n- Markdown: https://happytails.ai/en/image-tools/upscale-image.md\n- Structured JSON: https://happytails.ai/agents/en/image-tools/upscale-image/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `upscale-image` |\n| Category | image-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/upscale-image/run |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nProcessed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.\n\n### Inputs and settings\n\nNo free-text input is required. Use the file inputs and/or settings below.\n\nAccepted browser files: `.png,.jpg,.jpeg,.webp`. 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| `scale` | Scale factor | select | \"2\" | Allowed: 2, 4 |\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/upscale-image/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/upscale-image.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 \"scale\": {\n \"type\": \"string\",\n \"description\": \"Scale factor\",\n \"default\": \"2\",\n \"enum\": [\n \"2\",\n \"4\"\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\nCompare interpolation and model-based enhancement; no invented detail guarantees.\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\": \"upscale-image\",\n \"category\": \"image-tools\",\n \"built\": true,\n \"requirements\": \"Compare interpolation and model-based enhancement; no invented detail guarantees.\",\n \"implementation\": {\n \"fields\": [\n {\n \"key\": \"scale\",\n \"label\": \"Scale factor\",\n \"value\": \"2\",\n \"type\": \"select\",\n \"values\": [\n \"2\",\n \"4\"\n ]\n }\n ],\n \"files\": true,\n \"accept\": \".png,.jpg,.jpeg,.webp\",\n \"multiple\": false,\n \"input\": false,\n \"processing\": \"Server required\",\n \"native\": true,\n \"extra\": true,\n \"maxFileBytes\": 20971520,\n \"note\": \"Processed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.\",\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/upscale-image/run\",\n \"api\": {\n \"id\": \"upscale-image\",\n \"name\": \"Upscale image\",\n \"category\": \"image-tools\",\n \"description\": \"Enlarge an image with high-quality Lanczos resampling.\",\n \"notes\": \"Processed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.\",\n \"human_path\": \"/en/image-tools/upscale-image/\",\n \"method\": \"POST\",\n \"endpoint\": \"/api/v1/tools/upscale-image/run\",\n \"schema_url\": \"/api/v1/tools/upscale-image\",\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 \"scale\": {\n \"type\": \"string\",\n \"description\": \"Scale factor\",\n \"default\": \"2\",\n \"enum\": [\n \"2\",\n \"4\"\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\nEnlarge an image with high-quality Lanczos resampling.\n\n## Useful next steps\n\n- [Remove background](https://happytails.ai/en/image-tools/remove-background/): Remove an image background and export a transparent PNG. ([Markdown](https://happytails.ai/en/image-tools/remove-background.md))\n\n- [Photo denoiser](https://happytails.ai/en/image-tools/photo-denoiser/): Reduce colour noise in a photo with adjustable strength. ([Markdown](https://happytails.ai/en/image-tools/photo-denoiser.md))\n\n- [Resize image](https://happytails.ai/en/image-tools/resize-image/): Resize an image to the dimensions you need. ([Markdown](https://happytails.ai/en/image-tools/resize-image.md))\n\n## How to use Upscale image\n\n1. Choose a file in PNG, JPEG or WEBP.\n2. Review the settings, then choose Run Upscale image.\n3. Review the result, then use Copy result or a download link when available.\n\n## What to expect\n\nEnlarge an image with high-quality Lanczos resampling. Processed locally on this website’s server without an external conversion API. High-quality Lanczos resampling. This version increases resolution without an AI model or invented detail.\n" }