# CSV to excel

- Human page: https://happytails.ai/en/data-tools/csv-to-excel/
- Markdown: https://happytails.ai/en/data-tools/csv-to-excel.md
- Structured JSON: https://happytails.ai/agents/en/data-tools/csv-to-excel/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `csv-to-excel` |
| Category | data-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/csv-to-excel/run |
| Browser-agent interface | run_current_tool |

### Implementation notes

CSV cells are stored as text to preserve leading zeros and prevent formula execution. Nested JSON values become JSON strings.

### Inputs and settings

Text input: CSV.

Example or placeholder shown in the interface (not a validated fixture):

```text
name,score
Ada,98
Sam,92
```

Include a header row. Quote cells that contain commas or new lines. Up to 1,000,000 characters. Review the settings before running.

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `sheet` | Worksheet name (blank = first) | text | "" |  |
| `delimiter` | CSV separator | select | "," | Allowed: ,, ;, 	 |

### 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/csv-to-excel/run
Content-Type: application/json
```

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

#### Limits

| Limit | Value |
| --- | --- |
| request_bytes | 8388608 |
| input_characters | 1000000 |
| files_bytes | 5242880 |
| max_files | 0 |
| 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": {
        "sheet": {
          "type": "string",
          "description": "Worksheet name (blank = first)",
          "default": ""
        },
        "delimiter": {
          "type": "string",
          "description": "CSV separator",
          "default": ",",
          "enum": [
            ",",
            ";",
            "\t"
          ]
        }
      }
    }
  }
}
```

#### 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

Explicit column types, encoding and delimiter; prevent unintended formulas on export.

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

### Complete machine-readable capability record

```json
{
  "id": "csv-to-excel",
  "category": "data-tools",
  "built": true,
  "requirements": "Explicit column types, encoding and delimiter; prevent unintended formulas on export.",
  "implementation": {
    "fields": [
      {
        "key": "sheet",
        "label": "Worksheet name (blank = first)",
        "value": "",
        "type": "text"
      },
      {
        "key": "delimiter",
        "label": "CSV separator",
        "value": ",",
        "type": "select",
        "values": [
          ",",
          ";",
          "\t"
        ]
      }
    ],
    "note": "CSV cells are stored as text to preserve leading zeros and prevent formula execution. Nested JSON values become JSON strings.",
    "experience": {
      "automatic": false,
      "single": false,
      "label": "CSV",
      "placeholder": "name,score\nAda,98\nSam,92",
      "help": "Include a header row. Quote cells that contain commas or new lines. Up to 1,000,000 characters. Review the settings before running.",
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/csv-to-excel/run",
  "api": {
    "id": "csv-to-excel",
    "name": "CSV to excel",
    "category": "data-tools",
    "description": "Create an Excel workbook from CSV text.",
    "notes": "CSV cells are stored as text to preserve leading zeros and prevent formula execution. Nested JSON values become JSON strings.",
    "human_path": "/en/data-tools/csv-to-excel/",
    "method": "POST",
    "endpoint": "/api/v1/tools/csv-to-excel/run",
    "schema_url": "/api/v1/tools/csv-to-excel",
    "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": {
            "sheet": {
              "type": "string",
              "description": "Worksheet name (blank = first)",
              "default": ""
            },
            "delimiter": {
              "type": "string",
              "description": "CSV separator",
              "default": ",",
              "enum": [
                ",",
                ";",
                "\t"
              ]
            }
          }
        }
      }
    },
    "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": 0,
      "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

Create an Excel workbook from CSV text.

## Useful next steps

- [Excel to CSV](https://happytails.ai/en/data-tools/excel-to-csv/): Select sheet. ([Markdown](https://happytails.ai/en/data-tools/excel-to-csv.md))

- [CSV viewer](https://happytails.ai/en/data-tools/csv-viewer/): Preview CSV rows and columns in a readable table. ([Markdown](https://happytails.ai/en/data-tools/csv-viewer.md))

- [CSV remove duplicates](https://happytails.ai/en/data-tools/csv-remove-duplicates/): Remove duplicate CSV rows while keeping the first occurrence. ([Markdown](https://happytails.ai/en/data-tools/csv-remove-duplicates.md))

## How to use CSV to excel

1. Enter csv in the input field.
2. Review the settings, then choose Run CSV to excel.
3. Review the result, then use Copy result or a download link when available.

## What to expect

Create an Excel workbook from CSV text. Choose the CSV separator. Exported cells are stored as text to preserve identifiers and prevent formula execution. Text encoding and automatic type inference are not configurable.