Up until the 2007 version, Microsoft Excel used a proprietary binary file format called Excel Binary File Format (.XLS) as its primary format. Microsoft Excel 2007, along with the other products in the Microsoft Office 2007 suite, introduced new file formats. The first of these (.xlsx) is defined in the Office Open XML (OOXML) specification.
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Pick the target format on this page — the Excel converter handles CSV, TSV, TXT, Excel, JSON, XML, HTML and SQL. Choose the file, set the delimiter and encoding if needed, and convert one file or thousands in a batch.
Yes. Merge combines many Excel files into a single file, in the order you choose or in file-name order. Split breaks one large Excel file into smaller files by number of rows, by file size, or by a column value.
Every tool on this page ships for Windows (32 and 64 bit), macOS and Linux (.deb and .rpm), with a GUI and a command line interface. A free trial is available.