xlsx file format

.xlsx

what is an xlsx file?

The xlsx file extension is an open XML spreadsheet document primarily used by Microsoft Excel since 2007. XLSX spreadsheets can contain multiple pages, formulas, images, and plots.

download xlsx sample file

ffc.xlsx example file is licensed CC0, Public Domain Dedication

xlsx file extensions

.xlsx

xlsx file extension name

Open XML Microsoft spreadsheet

xlsx file type

primary: Document

secondary: spreadsheet, data

xlsx file structure

Each xlsx file makes up a workbook. Workbooks are made up of one or more spreadsheets. Each spreadsheet is made up of rows and columns that correspond to individual cells.

associated organization

Microsoft

xlsx format specification and identification

xlsx files are actually zip files in disguise. Replacing the .xlsx extension with .zip on a simple 2-sheet xlsx file reveals the following structure:

xlsx MIME type

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

xlsx file signature hex

50 4B 03 04 14 00 06 00

xlsx ISO 8859-1

PK..

xlsx offset

0

xlsx magic number

50 4B 03 04 [PK]

xlsx file character encoding / charset

binary