File compression software, such as WinZip, has little impact on Excel XLSX files as they’re already compressed files. Thus, the XLSX format already utilizes ZIP compression. The format consists of zipped XML files that you can explore by changing the Excel file’s format to ZIP in File Explorer. Therefore, compression utilities can’t significantly compress the XLSX file much more. So, users need to find alternative methods for either reducing Excel file sizes or sharing spreadsheets. One of the best ways to reduce an XLSX file is to save it as an XLSB instead. XLSB is the binary file format for Excel spreadsheets, which takes up less hard drive storage space.
How to save an Excel spreadsheet as an XLSB
How to share an Excel file via Google Drive
So, don’t waste your time trying to zip XLSX files. Instead, save them as XSLB files to reduce their size. If the file is far too big for email attachments, you’ll need to share the spreadsheet via cloud storage, such as Google Drive or OneDrive.
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