Excelize is an open-source Go library for reading and writing Microsoft Excel spreadsheets in XLSX, XLSM, XLTM, and related Office Open XML formats. It provides a native Go API for creating workbooks, editing cells, formatting sheets, working with formulas, charts, images, tables, and many other spreadsheet features.

The library is designed for both ordinary workbook manipulation and large-file scenarios, including streaming APIs that reduce memory pressure when generating or reading substantial spreadsheets. It supports a wide range of Excel structures while avoiding the need to automate a desktop copy of Microsoft Excel.

Excelize is useful for Go services, command-line tools, reporting systems, and backend applications that need to produce or process Excel files programmatically. Its broad format coverage and streaming capabilities make it suitable for everything from simple exports to complex document-generation pipelines.