What is XLS?
The older binary Excel workbook format. Previews show stored cell values.
Technical details
Legacy XLS workbooks use BIFF binary records, with workbook-global records and worksheet substreams rather than XML package parts. [1]
Background and compatibility
Microsoft's older Excel binary format predates OOXML; modern applications retain compatibility modes, but features vary by workbook generation. [1]
Sources and references
- Excel Binary File FormatMicrosoft Open Specifications
Preview on your device
A table of stored values from the first sheet; up to 100 rows. No formula recalculation.
Conversion support
Export workbook data as XLSX, ODS, CSV, TSV, JSON, or HTML. Text-based exports use the chosen sheet and do not preserve workbook formatting.
Read the format reference on Wikipedia ↗