This node writes the input data table into a spreadsheet of an Excel file, which can then be read with other applications such as Microsoft Excel. The node can create completely new files or append data to an existing Excel file. When appending, the input data can be appended as a new spreadsheet or after the last row of an existing spreadsheet. By adding multiple data table input ports, the data can be written/appended to multiple spreadsheets within the same file.

The node supports two formats chosen by file extension:

• .xls format: This is the file format which was used by default up until Excel 2003. The maximum number of columns and rows held by a spreadsheet of this format is 256 and 65536 respectively.
• .xlsx format: The Office Open XML format is the file format used by default from Excel 2007 onwards. The maximum number of columns and rows held by a spreadsheet of this format is 16384 and 1048576 respectively.

If the data does not fit into a single sheet, it will be split into multiple chunks that are written to newly chosen sheet names sequentially. The new sheet names are derived from the originally selected sheet name by appending " (i)" to it, where i=1,...,n.
When appending to a file, a sheet may already exist. In this case the node will (according to its settings) either replace the sheet, fail or append rows after the last row in that sheet. This can be used to append data to an Excel file without having to create a new sheet name once the original sheet is full by just selecting the original sheet name. The data will be appendend to the last sheet in the name sequence. The original sheet name does not have to be changed.

This node does not support writing files in the '.xlsm' format, yet appending is supported.

This node can access a variety of different file systems. More information about file handling in KNIME can be found in the official File Handling Guide.