ConvertOnline

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1. Convert Online
2. Document Converters
3. XLSX to XLS

{
  "convert": "xlsx-xls",
  "multiple": true,
  "from": "xlsx",
  "to": "xls",
  "controls": [
    {
      "type": "dropdown",
      "name": "format_version",
      "label": "Target XLS Version",
      "options": [
        {
          "label": "Excel 97-2003 (.xls)",
          "value": "MS Excel 97"
        },
        {
          "label": "Excel 95 (.xls)",
          "value": "MS Excel 95"
        }
      ],
      "defaultValue": "MS Excel 97",
      "desc": "Specifies the legacy XLS file format version for compatibility. Excel 97-2003 is recommended unless older compatibility is required."
    },
    {
      "type": "checkbox",
      "name": "preserve_formulas",
      "label": "Preserve Formulas",
      "defaultValue": true,
      "desc": "Attempts to keep formulas intact instead of converting them to static values during the conversion."
    },
    {
      "type": "checkbox",
      "name": "preserve_formatting",
      "label": "Preserve Formatting",
      "defaultValue": true,
      "desc": "Keeps original cell formatting, fonts, colors, borders, and alignment during conversion."
    },
    {
      "type": "checkbox",
      "name": "embed_macros",
      "label": "Preserve Macros",
      "defaultValue": true,
      "desc": "Keeps VBA macros from the XLSX file when saving as XLS, if macros are present."
    },
    {
      "type": "checkbox",
      "name": "remove_comments",
      "label": "Remove Comments",
      "defaultValue": false,
      "desc": "Deletes all cell comments from the spreadsheet during conversion."
    },
    {
      "type": "number",
      "name": "from_sheet",
      "label": "From Sheet",
      "optional": true,
      "range": {
        "min": 1,
        "max": 1000
      },
      "desc": "Specifies the first sheet number to include in the export. Leave blank to start from the first sheet."
    },
    {
      "type": "number",
      "name": "to_sheet",
      "label": "To Sheet",
      "optional": true,
      "range": {
        "min": 1,
        "max": 1000
      },
      "desc": "Specifies the last sheet number to include in the export. Leave blank to include all sheets until the end."
    },
    {
      "type": "checkbox",
      "name": "password_protect",
      "label": "Password Protect Output",
      "defaultValue": false,
      "desc": "Applies a password to open the XLS file. You'll be prompted for the password if enabled."
    },
    {
      "type": "checkbox",
      "name": "remove_personal_info",
      "label": "Remove Personal Information",
      "defaultValue": false,
      "desc": "Removes personal metadata such as author name, company, and file history from the spreadsheet."
    }
  ],
  "note": "Converting XLSX to XLS enables compatibility with older versions of Microsoft Excel and other legacy spreadsheet software. The XLS format has limitations compared to XLSX — such as a maximum of 65,536 rows and 256 columns per sheet — so data exceeding these limits will be truncated during conversion. Some XLSX-specific features like slicers, modern chart types, or conditional formatting rules may be downgraded or removed.",
  "type": "document",
  "operation": "convert"
}