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In this case, we would suggest you choose the ‘Strong compression’ option, which will push the compression rate even further. On top of that, we will also allow you to convert and compress as many documents as you need, all in one go. Batch compression is useful, especially when it comes to meeting application deadlines
Microsoft Excel up until 2007 version used a proprietary binary file format called Excel Binary File Format (.XLS) as its primary format. Excel 2007 uses Office Open XML (.XLSX) as its primary file format, an XML-based format that followed after a previous XML-based format called "XML Spreadsheet" ("XMLSS"), first introduced in Excel 2002. Although supporting and encouraging the use of new XML-based formats as replacements, Excel 2007 remained backwards-compatible with the traditional, binary formats
Probably the most common reason of a sudden increases in file sizes is including unused cells in worksheets. Although Excel doesn’t explicitly show this, there’s a Used Range for each spreadsheet. The computing power requirements are different for 100 cells and 17,179,869,184 cells, which is the limit Excel has since version 2007