Excel to .xlsx Converter

Convert .xls files to .xlsx format. Note: Only supports converting old .xls files to new .xlsx format.

Click to upload file or drag and drop file here

Maximum file size: 0MB Supported formats: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel

Key Facts

Category
Conversion & Encoding
Input Types
file, select, text
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Excel to .xlsx Converter allows you to quickly transform legacy .xls spreadsheet files into the modern .xlsx format, ensuring compatibility with current versions of Microsoft Excel and other spreadsheet software.

When to Use

  • •When you need to open an older .xls file in a modern application that only supports .xlsx.
  • •When you want to reduce file size and improve stability by migrating to the XML-based .xlsx format.
  • •When you are preparing legacy data archives for integration into modern cloud-based spreadsheet tools.

How It Works

  • •Upload your legacy .xls file using the file selector.
  • •Optionally specify a custom output filename for your converted document.
  • •Click the convert button to process the file and download the updated .xlsx version.

Use Cases

Updating legacy financial reports for modern accounting software compatibility.
Migrating historical project tracking sheets to current office suites.
Standardizing company-wide spreadsheet formats to the latest .xlsx version.

Examples

1. Updating Legacy Financial Records

Financial Analyst
Background
An analyst retrieved a decade-old financial report in .xls format that would not open in their current version of Excel.
Problem
The file was incompatible with modern software, preventing data analysis.
How to Use
Uploaded the legacy file and initiated the conversion to .xlsx.
Outcome
The file was successfully converted to .xlsx, allowing the analyst to open, edit, and perform calculations immediately.

2. Standardizing Departmental Templates

Office Administrator
Background
The department used an outdated .xls template for inventory tracking that caused errors in newer spreadsheet applications.
Problem
The old format caused compatibility warnings and limited the use of modern features.
How to Use
Uploaded the template and renamed the output to 'Inventory_Template_2026.xlsx'.
Outcome
The team received a modernized template that functions perfectly in current software environments.

Try with Samples

xml, xlsx, xls
XLSX Samples
Sample XLSX spreadsheets for worksheet parsing and data extraction testing
title token xlsx
xlsx, xls
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
preferred input family xlsx
xlsx
Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
preferred input family xlsx
xlsx
Text Case Format Samples
Examples of different text case formats: camelCase, snake_case, kebab-case, PascalCase, and more
matched family xml
xml

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FAQ

What file formats are supported?

This tool specifically supports converting legacy .xls files to the modern .xlsx format.

Is there a file size limit?

Yes, the tool supports files up to 10MB in size.

Will my data formatting be preserved?

Yes, the conversion process maintains your data, formulas, and basic formatting during the transition to .xlsx.

Can I convert multiple files at once?

No, this tool processes one file at a time.

Is my data secure?

Your files are processed securely and are not stored on our servers after the conversion is complete.

API Documentation

Request Endpoint

POST /en/api/tools/excel-version-converter

Request Parameters

Parameter Name Type Required Description
excelFile file (Upload required) Yes -
targetFormat select Yes -
fileName text No -

File type parameters need to be uploaded first via POST /upload/excel-version-converter to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-excel-version-converter": {
      "name": "excel-version-converter",
      "description": "Convert .xls files to .xlsx format. Note: Only supports converting old .xls files to new .xlsx format.",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=excel-version-converter",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]