spreadsheet Format

XLSX File Format

XLSX is the XML-based workbook format introduced in Microsoft Excel 2007. It contains worksheets, cell formulas, formatting, and data tables wrapped in an OpenXML zip structure.

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PDF, DOCX, XLSX, PPTX, JPG, PNG, MP3, MP4, EPUB, ZIP and 100+ more

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Technical Specifications

Extensions	.xlsx
MIME Types	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Category	Spreadsheet
Engine Tier	tier1-small-js
Magic Bytes / Sniffing	0x50 0x4B 0x03 0x04
Opens With	Microsoft Excel, Google Sheets, LibreOffice Calc, Apple Numbers
Good For	Financial modeling, business analytics, multi-tab accounting, and charting.
Not Recommended For	Lightweight programmatic data exchange where CSV or JSON is simpler.

Convert from XLSX (7 targets)

XLSXCSV(exact)XLSXPDF(high)XLSXJSON(exact)XLSXODS(exact)XLSXTSV(exact)XLSXXML(exact)XLSXSQL(exact)

Convert to XLSX (8 sources)

CSVXLSX(exact)PDFXLSX(approximate)NUMBERSXLSX(high)XLSXLSX(exact)ODSXLSX(exact)TSVXLSX(exact)XLSBXLSX(exact)XLTXXLSX(exact)