# Image to STL

- Human page: https://happytails.ai/en/maker-tools/image-to-stl/
- Markdown: https://happytails.ai/en/maker-tools/image-to-stl.md
- Structured JSON: https://happytails.ai/agents/en/maker-tools/image-to-stl/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `image-to-stl` |
| Category | maker-tools |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Use the visible action or interactive controls. |
| Browser processing | Server required |
| HTTP API | /api/v1/tools/image-to-stl/run |
| Browser-agent interface | run_current_tool |

### Implementation notes

Processed on our server with no external conversion service. Creates a solid height-map relief, not a complete 3D object. Transparent pixels use white. Open the STL in a slicer and confirm millimeter units before printing.

### Inputs and settings

No free-text input is required. Use the file inputs and/or settings below.

Accepted browser files: `.png,.jpg,.jpeg,.webp`. Choose one file.

Browser file-input limit: 20971520 bytes in total. HTTP limits can differ.

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `width` | Model width (mm) | number | 100 | min=1 max=500 step=1 |
| `height` | Relief height (mm) | number | 5 | min=1 max=50 step=1 |
| `base` | Base thickness (mm) | number | 2 | min=1 max=20 step=1 |
| `resolution` | Samples on longest side | number | 100 | min=8 max=256 step=1 |
| `invert` | Darker pixels are higher | checkbox | false |  |

### HTTP contract

API 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.

```http
POST https://happytails.ai/api/v1/tools/image-to-stl/run
Content-Type: application/json
```

[Detailed operation reference](https://happytails.ai/en/api/tools/image-to-stl.md) · [Shared API guide](https://happytails.ai/en/api.md)

#### Limits

| Limit | Value |
| --- | --- |
| request_bytes | 31457280 |
| input_characters | 1000000 |
| files_bytes | 20971520 |
| max_files | 1 |
| timeout_seconds | 90 |

#### Complete input schema

```json
{
  "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": {
        "width": {
          "type": "number",
          "description": "Model width (mm)",
          "default": 100.0,
          "minimum": 1,
          "maximum": 500,
          "multipleOf": 1
        },
        "height": {
          "type": "number",
          "description": "Relief height (mm)",
          "default": 5.0,
          "minimum": 1,
          "maximum": 50,
          "multipleOf": 1
        },
        "base": {
          "type": "number",
          "description": "Base thickness (mm)",
          "default": 2.0,
          "minimum": 1,
          "maximum": 20,
          "multipleOf": 1
        },
        "resolution": {
          "type": "number",
          "description": "Samples on longest side",
          "default": 100.0,
          "minimum": 8,
          "maximum": 256,
          "multipleOf": 1
        },
        "invert": {
          "type": "boolean",
          "description": "Darker pixels are higher",
          "default": false
        }
      }
    },
    "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."
          }
        }
      }
    }
  }
}
```

#### Complete output schema

```json
{
  "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"
              }
            }
          }
        }
      }
    }
  }
}
```

#### Error and retry handling

Failures 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.

### Browser-agent workflow

1. Open the human page in a browser that supports WebMCP.
2. Discover the interface exposed by that page; use its actual schema.
3. Select files on the page first when the tool requires files.
4. Call `run_current_tool` with valid input and settings.
5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.

Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.

### Planning specification

Brightness becomes height, with invert option; millimeter dimensions, base thickness and bounded resolution; closed watertight binary STL. Not full 3D object reconstruction.

This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.

### Complete machine-readable capability record

```json
{
  "id": "image-to-stl",
  "category": "maker-tools",
  "built": true,
  "requirements": "Brightness becomes height, with invert option; millimeter dimensions, base thickness and bounded resolution; closed watertight binary STL. Not full 3D object reconstruction.",
  "implementation": {
    "fields": [
      {
        "key": "width",
        "label": "Model width (mm)",
        "value": 100,
        "type": "number",
        "min": 1,
        "max": 500,
        "step": 1
      },
      {
        "key": "height",
        "label": "Relief height (mm)",
        "value": 5,
        "type": "number",
        "min": 1,
        "max": 50,
        "step": 1
      },
      {
        "key": "base",
        "label": "Base thickness (mm)",
        "value": 2,
        "type": "number",
        "min": 1,
        "max": 20,
        "step": 1
      },
      {
        "key": "resolution",
        "label": "Samples on longest side",
        "value": 100,
        "type": "number",
        "min": 8,
        "max": 256,
        "step": 1
      },
      {
        "key": "invert",
        "label": "Darker pixels are higher",
        "value": false,
        "type": "checkbox"
      }
    ],
    "files": true,
    "accept": ".png,.jpg,.jpeg,.webp",
    "multiple": false,
    "input": false,
    "processing": "Server required",
    "native": true,
    "expansion": true,
    "maxFileBytes": 20971520,
    "note": "Processed on our server with no external conversion service. Creates a solid height-map relief, not a complete 3D object. Transparent pixels use white. Open the STL in a slicer and confirm millimeter units before printing.",
    "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": "Convert file"
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/image-to-stl/run",
  "api": {
    "id": "image-to-stl",
    "name": "Image to STL",
    "category": "maker-tools",
    "description": "Turn an image into a solid 3D relief.",
    "notes": "Processed on our server with no external conversion service. Creates a solid height-map relief, not a complete 3D object. Transparent pixels use white. Open the STL in a slicer and confirm millimeter units before printing.",
    "human_path": "/en/maker-tools/image-to-stl/",
    "method": "POST",
    "endpoint": "/api/v1/tools/image-to-stl/run",
    "schema_url": "/api/v1/tools/image-to-stl",
    "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": {
            "width": {
              "type": "number",
              "description": "Model width (mm)",
              "default": 100.0,
              "minimum": 1,
              "maximum": 500,
              "multipleOf": 1
            },
            "height": {
              "type": "number",
              "description": "Relief height (mm)",
              "default": 5.0,
              "minimum": 1,
              "maximum": 50,
              "multipleOf": 1
            },
            "base": {
              "type": "number",
              "description": "Base thickness (mm)",
              "default": 2.0,
              "minimum": 1,
              "maximum": 20,
              "multipleOf": 1
            },
            "resolution": {
              "type": "number",
              "description": "Samples on longest side",
              "default": 100.0,
              "minimum": 8,
              "maximum": 256,
              "multipleOf": 1
            },
            "invert": {
              "type": "boolean",
              "description": "Darker pixels are higher",
              "default": false
            }
          }
        },
        "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"
  }
}
```

## Page guide

Turn an image into a solid 3D relief.

## Useful next steps

- [STL viewer](https://happytails.ai/en/maker-tools/stl-viewer/): Local mesh rendering, dimensions with chosen units and memory limits. ([Markdown](https://happytails.ai/en/maker-tools/stl-viewer.md))

- [STL to OBJ](https://happytails.ai/en/maker-tools/stl-to-obj/): Preserve mesh topology. ([Markdown](https://happytails.ai/en/maker-tools/stl-to-obj.md))

- [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))

## How to use Image to STL

1. Choose a supported file using the drop area or file picker.
2. Review the clearly labeled settings. Choose the action button to process your file.
3. Compare the result with your original, then download it. Keep the original for further edits.

## What to expect

Turn an image into a solid 3D relief. Brightness becomes height, with invert option; millimeter dimensions, base thickness and bounded resolution; closed watertight binary STL. Not full 3D object reconstruction.