Sample XLSX File Download

XLSX is the default spreadsheet format since Excel 2007, built on the Open XML standard — a zipped bundle of XML files describing sheets, cells, formulas, and styles instead of one proprietary binary blob. That structure makes it far easier to parse, validate, and generate programmatically than the old XLS format.

It's the format you'll hit most often: exports from web apps, reports from analytics tools, invoices, and data dumps from just about any system with a "download as Excel" button. Excel, LibreOffice Calc, Google Sheets, and most spreadsheet libraries support it natively.

Grab the sample below to test upload validation, parsing libraries, or import pipelines against a real XLSX file before a malformed one shows up from a customer.