ODS vs XLSX
A detailed comparison of OpenDocument Spreadsheet and Excel Spreadsheet — file size, quality, compatibility, and which format to choose for your workflow.
OpenDocument Spreadsheet
Spreadsheets & DataODS is the open-standard spreadsheet format used by LibreOffice Calc. It provides full spreadsheet functionality without vendor lock-in and is required by some government agencies.
About ODS filesExcel Spreadsheet
Spreadsheets & DataXLSX is the modern Microsoft Excel format based on Open XML. It is the industry standard for spreadsheets, supporting formulas, charts, pivot tables, and conditional formatting.
About XLSX filesStrengths Comparison
ODS Strengths
- Open standard (ISO/IEC 26300).
- Native to LibreOffice, OpenOffice, Collabora.
- Human-readable XML, easy to script.
- Preferred by governments and open-data initiatives.
- Supports macros via Basic (BeanShell, Python also possible).
XLSX Strengths
- Much smaller than legacy .xls files thanks to ZIP + XML.
- Human-readable structure — easy to extract data programmatically.
- Supports macros (as .xlsm variant), charts, pivot tables, conditional formatting.
- Universal support: Excel, LibreOffice, Google Sheets, Numbers, pandas.
- ISO/IEC 29500 standardized.
Limitations
ODS Limitations
- Excel opens ODS but often loses conditional formatting and advanced formulas.
- Microsoft-specific formulas (FILTER, LAMBDA) rarely round-trip.
- Business adoption is niche — XLSX dominates real-world exchange.
- Complex cross-sheet macros may break between ODS and Excel workflows.
XLSX Limitations
- Macros in .xlsm are a common malware vector — disabled by default in Office.
- 1M-row limit is a cultural problem — people put too much data in Excel.
- Subtle formula differences between Excel, LibreOffice, and Sheets.
- Large files with many formulas recalculate slowly.
Technical Specifications
| Specification | ODS | XLSX |
|---|---|---|
| MIME type | application/vnd.oasis.opendocument.spreadsheet | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
| Extension | .ods | — |
| Container | ZIP (OpenDocument Format) | ZIP (Office Open XML) |
| Standard | ISO/IEC 26300 | — |
| Native to | LibreOffice Calc, OpenOffice Calc | — |
| Max rows | — | 1,048,576 |
| Max columns | — | 16,384 |
| Released in | — | Microsoft Office 2007 |
| Variants | — | .xlsx, .xlsm (macros), .xlsb (binary) |
Typical File Sizes
ODS
- Small budget sheet 10-50 KB
- Multi-sheet workbook with charts 100 KB - 5 MB
- 1M-row data export 10-100 MB
XLSX
- Small budget spreadsheet 20–80 KB
- Financial model with charts 1–10 MB
- Large dataset (100k rows) 10–50 MB
- Enterprise model (1M+ rows) 100–500 MB
Ready to convert?
Convert between ODS and XLSX online, free, and without installing anything. Encrypted upload, automatic deletion after 2 hours.
Frequently Asked Questions
ODS (OpenDocument Spreadsheet) is a spreadsheet format used to store tabular data in rows and columns, typically with multiple sheets per workbook, cell formatting, formulas, and optional charts. It is part of the spreadsheets & data family and is the native format of a specific spreadsheet application.
XLSX is the default spreadsheet format for Microsoft Excel since 2007. It is based on the Office Open XML standard and supports multiple sheets, formulas, charts, pivot tables, and conditional formatting.
Excel, Google Sheets, LibreOffice Calc, and Apple Numbers handle most ODS files with high fidelity. For simple one-off viewing, Google Sheets and the Office web apps open ODS in the browser without installing anything. Convert to XLSX or CSV first if your target tool is strict about formats.
XLSX files open in Microsoft Excel, Google Sheets (free), LibreOffice Calc (free), and Apple Numbers. Online viewers like OneDrive and Google Drive also support them.
Upload the ODS to KaijuConverter and pick XLSX, CSV, ODS, TSV, or PDF. Our LibreOffice-based pipeline reads the sheet data, preserves cell types (numbers, dates, strings), and writes a clean target file. Multi-sheet workbooks come back as a single multi-sheet export or a ZIP of per-sheet CSVs depending on target.
When converting between spreadsheet formats that support formulas (XLSX, ODS), formulas transfer with function-name translation. When converting to CSV, formulas resolve to their cached evaluated value (open the source in Excel once to force evaluation if you suspect stale cache).