Convert XLS to XLSX
Converting from: XLS
Converting to: XLSX
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How to convert XLS to XLSX
Drop your XLS file into the box above, or click to browse.
Other Streets converts it to XLSX instantly, right in your browser.
Download your XLSX file — done.
About XLS
XLS is the older binary spreadsheet format used by Excel versions before 2007.
Still needed when working with legacy systems or older software that doesn't support XLSX.
XLS files are limited to 65,536 rows and 256 columns, a fraction of the modern XLSX capacity.
💡 The XLS binary format dates back to 1987, making it older than the World Wide Web itself.
About XLSX
XLSX is Microsoft Excel's spreadsheet format, storing rows, columns, formulas, and formatting in a compressed XML archive.
The standard choice for budgets, data tables, and anything requiring formulas or multiple sheets.
A single XLSX sheet can hold over 1 million rows and more than 16,000 columns.
💡 Excel's grid limit was only 65,536 rows until 2007. The modern 1,048,576-row limit is exactly 2^20.
Frequently asked questions
How do I convert XLS to XLSX?
Upload your XLS file above, and Other Streets converts it to XLSX instantly in your browser, no software to install and no waiting.
What's the difference between XLS and XLSX?
XLS and XLSX serve different purposes. XLS files are limited to 65,536 rows and 256 columns, a fraction of the modern XLSX capacity. A single XLSX sheet can hold over 1 million rows and more than 16,000 columns.
Is converting XLS to XLSX free?
Yes. Every conversion on Other Streets, including XLS to XLSX, is completely free with no limits or hidden fees.
Can I convert multiple XLS files to XLSX at once?
Yes. You can upload as many XLS files as you want and convert them all to XLSX in the same batch.