XLS to XLSX

Convert legacy XLS to modern XLSX

🔒 100% in-browser🆓 Free forever✨ No watermark

Drop files here or click to select

Drop one or more .xls files

🔒 Files never leave your device

How it works

1
Upload .xls files
Drop or select your legacy Excel files.
2
Convert
Each file is re-saved as .xlsx.
3
Download
Get a single file or a ZIP.

About XLS to XLSX

Convert legacy Excel .xls files to the modern .xlsx format. Runs entirely in your browser. XLS to XLSX on DashConvert runs entirely inside your browser using modern JavaScript APIs — no server ever sees your files. That means faster conversions, complete privacy, and no upload limits.

Whether you need to convert legacy xls to modern xlsx for work, study, or personal use, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside your documents.

Frequently asked questions

Are macros preserved?

No — VBA macros are stripped. Use .xlsm for macro-enabled Excel workbooks.

4 min read

XLS to XLSX: why your old Excel files break in modern tools (and how to fix them)

You inherit a shared drive full of .xls files from 2008. Half of them refuse to open in Excel 365 or Google Sheets. Here's what changed, and how to convert them without losing formulas.

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