Free · No signup · Private — runs in your browser

XLS to XLSX

Modernise a legacy .xls file by converting it to today’s .xlsx format — better compatibility with current Excel, Sheets and tools. Converted privately in your browser.

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Drop your .xls file here or click to browse

Converted on your device — nothing is uploaded.

One file is free — drag in several to batch-convert with Pro.

Need to edit, not just convert? Open the full Gridoly editor →

How it works

1Add your .xls fileDrag a legacy .xls file onto the box, or click to choose one.

2We convert itThe workbook is re-saved in the modern .xlsx format, sheets intact.

3Download XLSXDownload your upgraded .xlsx file.

Frequently asked questions

Will all my sheets be kept?

Yes — every sheet in the .xls workbook is preserved in the .xlsx output.

Why convert .xls to .xlsx?

.xlsx is smaller, safer and fully supported by modern Excel, Google Sheets and most tools.

Is it private?

Yes — conversion runs locally in your browser.

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