XLSX vs HTML
How do XLSX and HTMLcompare? Here's everything you need to know to choose the right format — and how to convert between them.
.xlsx
Full guide →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.
.html
Full guide →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 advantages
- Powerful formula and calculation engine
- Supports charts, pivot tables, and macros
- Industry standard for business data
- Compatible with Google Sheets and LibreOffice
XLSX limitations
- Complex format for simple data
- Can be slow with very large datasets
- Formatting issues between applications
- Requires office software for full features
HTML advantages
- Viewable in any web browser
- Rich formatting and multimedia
- Accessible and searchable text
- Can include interactive elements
HTML limitations
- Not a fixed-layout format
- Rendering varies between browsers
- External resources may break links
- Not ideal for print or signing
Which should you use?
XLSX and HTML serve different purposes. XLSX is ideal for financial reports and budgets, while HTML excels at web pages and email newsletters.
Best uses for XLSX
Best uses for HTML
Convert between XLSX and HTML
Need to switch formats? Convert for free with SquishConvert.