ODT to XLSX Converter

Online ODT to XLSX conversion — free and straightforward

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Tabular Precision

Tables from your ODT file land in proper XLSX cells — ready for formulas, charts, and pivot tables.

Cloud Processing

Conversion happens entirely on Convertio servers. Your computer stays free and no Excel installation is needed.

Bulk Conversion

Convert an entire folder of ODT files to XLSX in one session — no need to repeat the process file by file.

How to convert ODT to XLSX

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose xlsx or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your xlsx file right afterwards

About formats

ODT (OpenDocument Text) is the word processing format defined by the OpenDocument Format (ODF) standard, developed by the OASIS technical committee and first published as ODF 1.0 on May 1, 2005, later adopted as international standard ISO/IEC 26300. An ODT file is a ZIP archive containing XML documents that describe text content, formatting styles, metadata, and settings using a vendor-neutral, royalty-free specification. The document body resides in content.xml with styling rules in styles.xml, while embedded images, fonts, and other resources are stored alongside in the package. The format supports rich word processing features including paragraph and character styles, tables, footnotes, tracked changes, table of contents generation, bibliography management, mail merge fields, and embedded vector and raster graphics. ODT serves as the native format for LibreOffice Writer, Apache OpenOffice Writer, and Calligra Words, and can be imported by Microsoft Word, Google Docs, and other commercial tools. One advantage is vendor independence — ODT is governed by an open standard rather than a single company, ensuring long-term document accessibility free from proprietary lock-in. This makes ODT particularly important for government agencies, educational institutions, and organizations with archival mandates. The XML-based architecture provides another strength, enabling programmatic document generation and processing using standard tools in any programming language.
Developer: OASIS
Initial release: May 1, 2005
XLSX is the default spreadsheet format for Microsoft Excel since Office 2007, based on the Office Open XML (OOXML) standard published as ECMA-376 and adopted as ISO/IEC 29500. An XLSX file is a ZIP archive containing XML documents that describe workbook structure, sheet data, styles, shared strings, formulas, charts, pivot tables, and relationships between components. Each worksheet is stored as a separate XML part where cells are organized by row and column references with typed values and style indices. The XML foundation enables programmatic spreadsheet creation and manipulation using libraries like openpyxl (Python), Apache POI (Java), and ClosedXML (.NET) without requiring Excel. XLSX dramatically expanded capacity compared to XLS: over 1 million rows and 16,384 columns per sheet, enabling use cases previously impossible in the binary format. One advantage is openness and cross-platform support — the documented OOXML specification enables implementation by LibreOffice Calc, Google Sheets, Apple Numbers, and numerous specialized tools. Built-in ZIP compression is another practical strength: XLSX files are typically 50-75% smaller than equivalent XLS files, and the modular XML structure improves data recovery when files are partially corrupted. The format supports modern Excel features including structured tables, slicers, sparklines, Power Query connections, and real-time co-authoring. XLSX has become the standard format for spreadsheet data interchange across business, scientific, and government domains.
Developer: Microsoft
Initial release: January 30, 2007

Frequently Asked Questions

Why convert ODT to XLSX?

XLSX is the modern Excel standard — converting lets you manipulate document tables with full spreadsheet tools.

What data transfers best to XLSX?

Tabular content in ODT converts cleanly. Running text may land in single cells rather than structured rows.

How do I open XLSX files?

Microsoft Excel, Google Sheets, LibreOffice Calc, and Apple Numbers all handle XLSX natively.

Is this tool free?

Yes — ODT to XLSX conversion is free on Convertio. Premium plans support higher volumes and bigger files.

Is my file secure?

Absolutely. Uploads are erased right after processing and converted files are purged within 24 hours.

Can I batch-convert to XLSX?

Yes — upload multiple ODT documents and convert them all to XLSX spreadsheets simultaneously.

ODT to XLSX Quality Rating

4.0 (356 votes)
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