How do XLSX and HTMLcompare? Here's everything you need to know to choose the right format — and how to convert between them.
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.
HyperText Markup Language
HTML is the standard markup language for creating web pages. While primarily a web technology, HTML files are also used as a portable document format with rich formatting and multimedia support.
| Specification | XLSX | HTML |
|---|---|---|
| Full name | Office Open XML Spreadsheet | HyperText Markup Language |
| Extension | .xlsx | .html |
| MIME type | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet | text/html |
| Category | Document | Document |
| Developer | Microsoft | W3C / WHATWG |
| Year introduced | 2007 | 1993 |
XLSX and HTML serve different purposes. XLSX is ideal for financial reports and budgets, while HTML excels at web pages and email newsletters.
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