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Convert XLS to XLSX

Upgrade legacy Excel .xls workbooks to modern XLSX format.

Open full converter — Spreadsheet Converter

Free XLS to XLSX converter

AnyConv365 helps you convert XLS files to XLSX without installing software. Open this page, choose your file, and download the result.

This XLS to XLSX path is especially useful for using spreadsheet data in modern editing, reporting, and print workflows. Keep the source file so you can return to features the target format cannot store.

XLS to XLSX Conversion Guide

How it works

Is XLS to XLSX conversion free?

Yes. AnyConv365 lets you convert XLS to XLSX online for free with no account required.

Will my file quality be preserved?

We aim for the best practical fidelity for each pair. Preview the download before sharing when quality is critical.

Do you store my files?

Server-side source files are deleted immediately after a successful conversion. If conversion fails, the source file is retained for up to one hour for error diagnosis and then deleted automatically.

Are formulas preserved?

CSV exports values, not live formulas. Keep an XLSX/ODS copy when you still need calculations.

Will macros survive XLS to XLSX?

Data and typical formatting convert, but legacy macros may be stripped or need rework in Excel.

Where can I learn more about this conversion?

See our guide: XLS to XLSX Conversion Guide. It covers when to convert, common pitfalls, and related formats.

XLS → XLSX

What to check

Privacy: Server-side source files are deleted immediately after a successful conversion. If conversion fails, the source file is retained for up to one hour for error diagnosis and then deleted automatically.

  1. 1 Compare the result with the original before deleting or sharing anything.
  2. 2 Check content, layout, timing, fonts, or folder structure that matters to your workflow.
  3. 3 Keep the source file as a backup because some format-specific features cannot transfer.
Testing and content method →

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