Online XLSX converter
Easily convert documents to the xlsx format for free using our online converter.
How to convert a xlsx file?
Step 1
Upload file
You can select the file you want to convert from your computer, Google Drive, Dropbox or simply drag and drop it onto the page.
Step 2
Select «to aai»
Choose aai or any of the other 200+ supported formats you'd like to convert to.
Step 3
Download your aai file
Please wait for the conversion to complete, then click on the download button to obtain your converted file in the aai format.
Best xlsx converter tool
Convert aai Fast and easy
Simply drag and drop your aai files onto the webpage, and you'll be able to convert them to over 250 different file formats, all without having to register, provide an email address, or include a watermark.
Secure aai Conversion
As soon as you upload your aai files, we instantly delete them. Converted files are then deleted after 24 hours. Furthermore, we ensure that all file transfers are secure through advanced SSL encryption.
No Software Installation Required
You don't have to go through the hassle of installing any software. We handle all aai conversions in the cloud, which means that none of your computer's resources will be used in the process.
Office Open XML Document
| Extension | .xlsx |
| Category | 🔵 documents |
| Programs | 🔵 Microsoft Office 🔵 LibreOffice 🔵 Kingsoft Office 🔵 Google Docs |
| Main program | 🔵 Microsoft Office |
| Description | 🔵 .xlsx (Microsoft Excel Open XML Spreadsheet) The .xlsx format is the default file format for spreadsheets created in Microsoft Excel, starting with Excel 007 and later versions. It's part of the Office Open XML specification and uses XML and ZIP compression for smaller file sizesThe .xlsx format supports complex spreadsheets with data, formulas, charts, pivot tables, and various formatting. It is more efficient and secure compared to the older .xls format and is widely used in business, education, and personal data organization. |
| Technical details | 🔵 Introduced in Excel 2007 as part of the Office Open XML (OOXML) standard, the `.xlsx` format is a notable advancement from the `.xls` format. It employs XML within a ZIP archive structure for improved data readability and efficient organization of elements like worksheets and shared strings. This format supports extensive datasets, allowing up to 1,048,576 rows and 16,384 columns per sheet, and includes advanced features like formulas, charts, pivot tables, and VBA macros. The use of shared XML files optimizes file size. `.xlsx` enhances cross-platform interoperability, includes security features like digital signatures and encryption, and has a macro-enabled `.xlsm` variant. Its XML structure minimizes file corruption risks and aids in data recovery. Widely compatible with modern spreadsheet software and older Excel versions, `.xlsx` has significantly enhanced Excel workbook functionality and efficiency, making it a preferred format for contemporary spreadsheet tasks. |
| Developer | 🔵 Microsoft |
| MIME type | 🔵 application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |