To append multiple Excel files, make sure the first worksheet in every file has exactly the same column headers in the same order. The merge tool keeps one header row and appends data in the selected file order.
Open Merge Excel files, select your XLSX files in the intended order and start processing. Download the result and check the data row count and key columns.
This version preserves data values only. It does not preserve formatting, charts, macros or formula calculations. Formula cells use cached results from the source file. A formula with no cached result becomes an empty value. Recalculate and save the source workbook in Excel before processing.
Files with different headers cannot be appended directly. Standardize the column names and order first. Matching records by an identifier is a different operation from appending rows.