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XLSX Converter
Online XLSX converters slow or capped? reaConverter works locally, with instant results and no upload limit.
How to Convert .xlsx Files in Bulk
1. Install reaConverter
2. Select XLSX Files
3. Start Conversion
Step by step
See It in Action
For quick and effortless XLSX file handling on your PC, reaConverter offers powerful conversion tools with batch processing. Best of all, it works entirely offline — ensuring your sensitive data never leaves your computer.
Extra Tools
Do more with your documents
Converting XLSX documents for use in a larger project? reaConverter offers many ways to process documents, so you can customize them according to your requirements.
Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.
User reviews
From those who tried it
Average User Rating:Last updated on July 28, 2026
Questions & Answers
XLSX documents: Frequently Asked Questions
What are XLSX files?
XLSX is the Office Open XML format for spreadsheets, standardized as ISO/IEC 29500 and used by default in Excel since version 2007. A file is a ZIP package, so it can be renamed to .zip and opened with an archive program. Inside, the workbook part lists the sheets, and each sheet is a separate XML part with its cells. Repeated text values are collected in a table of shared strings, the styles and number formats are kept in their own part, and charts, drawings, and pictures are separate parts linked by relationship files. A formula is stored as text together with the last calculated value, and a date is stored as a number. A worksheet can have up to 1,048,576 rows and 16,384 columns, the last column being XFD, and a workbook can use millions of colors. Because of the compression and the XML structure, the file is usually much smaller than an XLS file with the same content, and a damaged part does not always destroy the whole workbook. The format cannot hold macros, and a workbook with macros uses the XLSM extension. Supported by Microsoft Excel.
Can reaConverter open XLSX files?
reaConverter fully supports the XLSX document format – open, edit, and export XLSX files to any other popular file format with ease.
How do I change XLSX to another format?
reaConverter is a user-friendly tool for converting XLSX files. Once installed on your computer, it allows you to convert all your .xlsx files at once with just a few clicks. You can even convert XLSX documents directly from Windows Explorer using the right-click menu — fast and convenient.
Why choose offline conversion with reaConverter?
Keep your sensitive data 100% private with offline processing that never exposes files to cloud risks. Our software meets strict compliance standards (GDPR, HIPAA, CCPA) while handling confidential documents for legal, healthcare and financial sectors.
Can I convert XLSX online?
If you only want to convert a few XLSX documents, you are welcome to try our free online XLSX converter.
How can I turn XLSX files on my computer to another format?
The best way to convert XLSX documents on your PC is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from XLSX.
How can I automate XLSX files conversion?
reaConverter supports all the essential automation features, such as right-click сonversion and Watch Folders, for the most efficient automated file conversion in any software of its kind.
Can I convert XLSX files using scripts or the command-line interface?
reaConverter provides full access to all its features from the Windows command-line shell, including the command-line xlsx converter.
What else can I do with reaConverter?
Convert vector filesChange image DPIConvert DICOM filesCrop pictureChange format settings
What formats can I convert a XLSX file to?
Discover More
Beyond XLSX conversion
Convert .xlsx files in batches of any size, with editing and processing applied along the way. The same tool also handles 800+ other formats, including CAD, medical imaging, and GIS.
