# Bulk resize images

- Human page: https://happytails.ai/en/image-tools/bulk-resize-images/
- Markdown: https://happytails.ai/en/image-tools/bulk-resize-images.md
- Structured JSON: https://happytails.ai/agents/en/image-tools/bulk-resize-images/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `bulk-resize-images` |
| Category | image-tools |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Use the visible action or interactive controls. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | /api/v1/tools/bulk-resize-images/run |
| Browser-agent interface | run_current_tool |

### Implementation notes

Runs on your device. Select up to 20 images. Aspect ratios and transparency are preserved. PNG output can be larger than a JPEG original.

### Inputs and settings

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

Accepted browser files: `.png,.jpg,.jpeg,.webp`. Multiple files are supported.

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

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `width` | Maximum width (px) | number | 1200 | min=1 max=8192 step=1 |
| `enlarge` | Allow enlarging smaller images | 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/bulk-resize-images/run
Content-Type: application/json
```

[Detailed operation reference](https://happytails.ai/en/api/tools/bulk-resize-images.md) · [Shared API guide](https://happytails.ai/en/api.md)

#### Limits

| Limit | Value |
| --- | --- |
| request_bytes | 8388608 |
| input_characters | 1000000 |
| files_bytes | 5242880 |
| max_files | 20 |
| timeout_seconds | 12 |

#### 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": "Maximum width (px)",
          "default": 1200.0,
          "minimum": 1,
          "maximum": 8192,
          "multipleOf": 1
        },
        "enlarge": {
          "type": "boolean",
          "description": "Allow enlarging smaller images",
          "default": false
        }
      }
    },
    "files": {
      "type": "array",
      "maxItems": 20,
      "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

Up to 20 images and 20 MiB total; preserve aspect ratio; shrink only by default; report each output size; unique numbered filenames.

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

### Complete machine-readable capability record

```json
{
  "id": "bulk-resize-images",
  "category": "image-tools",
  "built": true,
  "requirements": "Up to 20 images and 20 MiB total; preserve aspect ratio; shrink only by default; report each output size; unique numbered filenames.",
  "implementation": {
    "fields": [
      {
        "key": "width",
        "label": "Maximum width (px)",
        "value": 1200,
        "type": "number",
        "min": 1,
        "max": 8192,
        "step": 1
      },
      {
        "key": "enlarge",
        "label": "Allow enlarging smaller images",
        "value": false,
        "type": "checkbox"
      }
    ],
    "files": true,
    "multiple": true,
    "input": false,
    "accept": ".png,.jpg,.jpeg,.webp",
    "maxFileBytes": 20971520,
    "note": "Runs on your device. Select up to 20 images. Aspect ratios and transparency are preserved. PNG output can be larger than a JPEG original.",
    "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/bulk-resize-images/run",
  "api": {
    "id": "bulk-resize-images",
    "name": "Bulk resize images",
    "category": "image-tools",
    "description": "Resize a batch of photos and download one ZIP.",
    "notes": "Runs on your device. Select up to 20 images. Aspect ratios and transparency are preserved. PNG output can be larger than a JPEG original.",
    "human_path": "/en/image-tools/bulk-resize-images/",
    "method": "POST",
    "endpoint": "/api/v1/tools/bulk-resize-images/run",
    "schema_url": "/api/v1/tools/bulk-resize-images",
    "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": "Maximum width (px)",
              "default": 1200.0,
              "minimum": 1,
              "maximum": 8192,
              "multipleOf": 1
            },
            "enlarge": {
              "type": "boolean",
              "description": "Allow enlarging smaller images",
              "default": false
            }
          }
        },
        "files": {
          "type": "array",
          "maxItems": 20,
          "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; same transformation code as browser tools",
    "limits": {
      "request_bytes": 8388608,
      "input_characters": 1000000,
      "files_bytes": 5242880,
      "max_files": 20,
      "timeout_seconds": 12
    }
  },
  "agent_processing": "Server; same transformation code as browser tools",
  "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

Resize a batch of photos and download one ZIP.

## Useful next steps

- [Circle crop image](https://happytails.ai/en/image-tools/circle-crop-image/): Crop a centered circle and download a transparent PNG. ([Markdown](https://happytails.ai/en/image-tools/circle-crop-image.md))

- [Round image corners](https://happytails.ai/en/image-tools/round-image-corners/): Give an image rounded corners with a transparent background. ([Markdown](https://happytails.ai/en/image-tools/round-image-corners.md))

- [Add image border](https://happytails.ai/en/image-tools/add-image-border/): Add a solid border without covering your image. ([Markdown](https://happytails.ai/en/image-tools/add-image-border.md))

## How to use Bulk resize images

1. Choose one or more images.
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

Resize a batch of photos and download one ZIP. Up to 20 images and 20 MiB total; preserve aspect ratio; shrink only by default; report each output size; unique numbered filenames.