Convert to XLSX online

Free online converter for converting files to XLSX.

How to convert files to XLSX?

Upload your file

Click the 'Choose File' button or drag and drop your file into the upload area. Supported formats include SQL, SQLITE, SQLITE3 and more.

Select the output format

Make sure XLSX is selected as the conversion format. Adjust additional settings if needed.

Start the conversion process

Click the 'Convert' button and wait a few seconds. All conversions are performed on our servers.

Download the result

Once the process is complete, click the 'Download' button and save the file in XLSX format.

Why choose our XLSX converter?

We ensure quality, convenience, and support for all formats.

High-quality to XLSX conversion

We guarantee precise to XLSX file conversion without any loss of quality.

Support for multiple formats

You can convert your to XLSX files from over 200 different formats, including images, documents, and more.

Compatible with all devices

Convert to XLSX files from any device – whether it's a computer, tablet, or smartphone.

User-friendly interface

Our service is designed to make to XLSX conversion easy for everyone in just a few simple steps.

Full data security

All files are transmitted and stored using advanced encryption technologies.

High-speed processing

Thanks to cloud technology, we ensure fast processing even for large to XLSX files.

Convert to XLSX: supported formats

.XLSX

XLSX

Office Open XML Spreadsheet

Data type	Spreadsheet document
MIME type	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Developer	Microsoft (OOXML standardized via Ecma International and ISO/IEC)
Primary use cases	Spreadsheets for analysis and reporting, budgeting, calculations with formulas, tables, charts, pivot tables, data exchange, and business documents

What is the XLSX file format?

XLSX is an Office Open XML spreadsheet file: a ZIP package of XML parts that stores workbooks, sheets, formulas, styles, and charts.

XLSX file characteristics

Data type	Spreadsheet document
MIME type	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Container format	Open Packaging Conventions (OPC) ZIP package containing SpreadsheetML XML parts (workbook, worksheets, styles, shared strings, charts, relationships, and optional embedded resources)
Structure type	ZIP package (OPC) with XML parts and relationship files (.rels)
Metadata	Package/core properties and application-specific metadata; may include authoring tool info, timestamps, and custom properties (tool-dependent)
Standard / Specification	ISO/IEC 29500 (Office Open XML) and ECMA-376; media type registered by IANA
Typical file size	From a few KB (simple tables) to hundreds of MB or more (large datasets, images, many formulas, multiple sheets)
Max file size	No fixed format limit; practical limits depend on the application, available memory, and spreadsheet complexity
Year introduced	2007

Advantages

The XLSX file format offers several advantages that make it suitable for common use cases.

Widely supported modern spreadsheet format;
Good fidelity for formulas, formatting, and charts;
ZIP-compressed package reduces size;
Works well with cloud collaboration tools;
Standardized as OOXML

Limitations

The XLSX file format has certain limitations that may affect its use in specific scenarios.

XLSX is typically macro-free (use .xlsm for VBA macros). Real-world interoperability depends on the producing app, OOXML conformance (Strict/Transitional), and supported feature set (e.g., some advanced Excel features may not round-trip perfectly in other software).

Compatibility

XLSX spreadsheets can be opened and edited using various spreadsheet applications.

Supported platforms: Microsoft Excel (Windows/macOS), LibreOffice, Google Sheets (import), Apple Numbers (import), many third-party libraries and viewers
Supported devices: Computers, tablets, and smartphones (via office apps or viewers)
Browser support: No
Mobile support: Yes
Cloud support: Yes
Backward compatibility: Yes

Security considerations

Treat XLSX as untrusted input: files may contain external links, embedded objects, or crafted content targeting parser vulnerabilities. Keep software updated and avoid opening unknown files in sensitive environments.

License

Open standard (ISO/IEC 29500 / ECMA-376); implementations may include vendor-specific extensions

XLSX is the standard Excel workbook format introduced with Microsoft Office 2007. Internally it is an OOXML (ISO/IEC 29500) Open Packaging Conventions ZIP container with SpreadsheetML XML files for workbook structure, worksheets, shared strings, styles, charts, and related resources. XLSX is typically macro-free (macros are stored in .xlsm).