The converter also works in reverse, so you can convert other "Office Open XML Spreadsheet" formats to XLSX without using software like Microsoft Excel or a similar tool.
The .XLSX file is the default spreadsheet format for Microsoft Excel, built on the Office Open XML standard. Under the hood, it is a compressed ZIP archive containing structured XML files, text, and media assets. While heavily used globally for data analysis and accounting, the .XLSX format has notable disadvantages. Full native compatibility requires a paid Microsoft 365 subscription. Complex XML structures make these files bloated compared to flat data, and they are difficult to parse in custom software without heavy libraries. For raw data ingestion or web use, you should convert .XLSX to CSV to strip unnecessary formatting and ensure rapid processing. For archiving or sharing fixed-layout reports, convert to PDF. If you prefer open-source software like LibreOffice, convert to ODS. Drop your file here to view and convert it securely right in your browser.
Use Convert.Guru to open and convert your XLSX file.
If you want to convert XLSX file to JSON, JPG, XLSM or XLSB, you can use Microsoft Excel or similar software from the "Spreadsheet Data Storage" category. In the File menu, look for Save As… or Export….
To convert NOTES or QPW files to XLSX, try Microsoft Excel or another comparable tool in the "Spreadsheet Data Storage" category.
The XLSX Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our XLSX converter.