Format comparison
XLS vs EPUB
How do XLS and EPUBcompare? Here's everything you need to know to choose the right format — and how to convert between them.
.xls
Full guide →Microsoft Excel Spreadsheet (Legacy)
XLS is the legacy binary format used by Microsoft Excel before 2007. While superseded by XLSX, many existing spreadsheets and enterprise systems still use this format.
.epub
Full guide →Electronic Publication
EPUB is the open standard for digital books and publications. It supports reflowable content that adapts to any screen size, making it the preferred format for e-readers and reading apps.
| Specification | XLS | EPUB |
|---|---|---|
| Full name | Microsoft Excel Spreadsheet (Legacy) | Electronic Publication |
| Extension | .xls | .epub |
| MIME type | application/vnd.ms-excel | application/epub+zip |
| Category | Document | Document |
| Developer | Microsoft | International Digital Publishing Forum (IDPF) |
| Year introduced | 1987 | 2007 |
XLS advantages
- Compatible with older Excel versions
- Widely recognized format
- Supported by all major spreadsheet apps
- Large installed base
XLS limitations
- Limited to 65,536 rows and 256 columns
- Larger file sizes than XLSX
- Binary format — harder to recover
- Missing modern Excel features
EPUB advantages
- Reflowable text — adapts to any screen
- Open standard with wide support
- Supports rich formatting and images
- Accessible with screen readers
EPUB limitations
- Not supported by Amazon Kindle natively
- Complex internal structure
- Formatting can be inconsistent
- Less control over layout than PDF
Which should you use?
XLS and EPUB serve different purposes. XLS is ideal for legacy spreadsheet compatibility, while EPUB excels at e-books and digital publications.
Best uses for XLS
Legacy spreadsheet compatibility
Older enterprise systems
Historical data archives
Backward-compatible exports
Best uses for EPUB
E-books and digital publications
Online magazines and journals
Educational textbooks
Documentation and manuals
Convert between XLS and EPUB
Need to switch formats? Convert for free with SquishConvert.