XLS to XLSX Converter

Convert legacy XLS files to modern XLSX format online for free

Convert XLS to XLSX

ここにファイルをドラッグ&ドロップ!

またはクリックしてファイルを選択

Supported formats: XLS • No file size limit

100％無料 Convert unlimited XLS files to XLSX!

XLS to XLSX Converter – Free Online Tool

In today's data-driven world, file formats matter. Our free XLS to XLSX Converter is designed to help you quickly transform files with just a few clicks. Whether you're a developer handling APIs, a student working on a project, or a business professional preparing data, this tool makes conversion effortless.

What is XLS Format?

XLS is the legacy Excel file format used by Microsoft Excel 97-2003. It's a binary format that stores spreadsheet data including formulas, charts, and formatting. While widely supported, it has size and feature limitations compared to modern formats.

What is XLSX Format?

XLSX is the modern Excel file format introduced in Excel 2007. It uses Open XML standard, offers better compression, larger file size support, improved data recovery, and enhanced security features. It's the current standard for spreadsheet files.

Why Convert XLS to XLSX?

There are many reasons why people need this conversion. From simplifying analytics to improving application compatibility, converting with our tool ensures accuracy, reliability, and speed. XLSX offers better performance, security, and compatibility with modern applications.

ステップバイステップガイド

  1. Upload your XLS file to our converter.
  2. Click the 転用 button.
  3. Download your ready-to-use XLSX file instantly.

このプロセスは迅速かつ安全であり、技術的な専門知識は必要ありません。

Features of Our XLS to XLSX Converter

  • ✅ 100 ％ ％無料で無制限のコンバージョンでご利用いただけます。
  • ✅ 迅速な処理と瞬時の結果。
  • 変換後の自動削除によるファイルの✅安全な処理。
  • PC、Mac、Android、iOSを含むすべてのデバイスで✅動作します。
  • ソフトウェアのインストールは必要✅ありません。完全にWebベースです。
  • 毎回✅ 正確で信頼性の高いコンバージョン。

使用事例

  • 開発者 Modernize legacy Excel files for APIs or applications.
  • Students: Update old spreadsheets for compatibility with current software.
  • ビジネス Migrate historical data to modern Excel format.
  • データアナリスト： Ensure compatibility with latest analysis tools.

【よくある質問】

はい、隠れた手数料なしで完全に無料です。

No, this is a 100% online tool.

Yes, our tool preserves structure and data integrity.

結論

Our XLS to XLSX Converter is the simplest, safest, and most efficient way to handle file conversions online. Stop wasting time with complex manual processes – try it now, upload your file, and get your converted version instantly!