How to open a .xlsx file?

XLSX files can be opened by most office suites and text editors. You can also convert XLSX to other formats online using SquishConvert.

How to convert a .xlsx file?

Upload your .xlsx file to SquishConvert, select an output format, and click Convert. Your converted file will be ready to download in seconds.

Document format

.xlsx

Office Open XML Spreadsheet

XLSX is the default format for Microsoft Excel spreadsheets. It supports complex formulas, charts, pivot tables, and large datasets. It's the industry standard for data analysis and financial modeling.

MIME type

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Developer

Microsoft

Introduced

2007

Advantages

Powerful formula and calculation engine
Supports charts, pivot tables, and macros
Industry standard for business data
Compatible with Google Sheets and LibreOffice

Limitations

Complex format for simple data
Can be slow with very large datasets
Formatting issues between applications
Requires office software for full features

When to use XLSX

Financial reports and budgets

Data analysis and modeling

Inventory and project tracking

Survey results and data collection

Technical details

XLSX is a ZIP-compressed package of XML files following OOXML standard. It contains worksheets, shared strings, styles, and calculation chains. Supports up to 1,048,576 rows and 16,384 columns.