Free · No Upload · Instant

Convert XLSX to ODS Free Online — Best XLSX to ODS Converter 2025

Convert XLSX to ODS online for free. Fast, private Microsoft Excel to OpenDocument Spreadsheet converter — no upload, no signup. Works in your browser instantly.

Choose Files

or drag and drop files here

Max file size: 2GB

Your files are processed locally in your browser. Nothing is uploaded to any server.

How to Convert XLSX to ODS

Upload your XLSX file by clicking "Choose Files" or drag and drop it.

Select ODS as the output format.

Click "Convert Now" and download your converted file.

About XLSX Format

Extension: .xlsx
Full name: Microsoft Excel

About ODS Format

Extension: .ods
Full name: OpenDocument Spreadsheet

Frequently Asked Questions

Is it safe to convert XLSX to ODS online?

Yes! Convert999 processes all files directly in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

How long does it take to convert XLSX to ODS?

Conversion is nearly instant for most files. Large files may take a few seconds depending on your device's processing power.

Is there a file size limit?

Convert999 supports files up to 2GB. Processing happens locally, so larger files depend on your device's available memory.

Do I need to install any software?

No installation required. Convert999 works entirely in your web browser on any device.

Can I convert XLSX to ODS on my phone?

Yes! Convert999 works on any device with a web browser — iPhone, Android, iPad, or desktop. No app installation required. Simply open the converter, upload your XLSX file, and download the converted ODS file.

Will I lose quality converting XLSX to ODS?

Convert999 uses high-quality conversion algorithms to minimize quality loss. For lossless formats, the conversion is exact. For lossy formats like images and audio, we use optimized settings that balance quality and file size.

Can I batch convert multiple XLSX files to ODS?

Yes, Convert999 supports batch conversion. Select or drag & drop multiple XLSX files and convert them all to ODS format at once. Each file is processed locally in your browser.

What is the difference between XLSX and ODS?

Microsoft Excel (XLSX) and OpenDocument Spreadsheet (ODS) differ in compression, compatibility, and features. XLSX is optimized for its native use cases, while ODS may offer different advantages. Visit our XLSX vs ODS comparison page for a detailed breakdown.

Why Convert XLSX to ODS?

Advantages

✓OpenDocument Spreadsheet offers better compatibility with modern applications and workflows
✓Converting is completely free with no file size limits on Convert999
✓Your files never leave your device — 100% private and secure conversion
✓Instant conversion without waiting for server processing

Key Differences

→XLSX (Microsoft Excel) is optimized for its native use cases
→ODS (OpenDocument Spreadsheet) may offer different compression or feature set
→Choose based on your target platform, quality needs, and file size requirements

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