Combine multiple CSV files into one document.
Drag and drop CSV files here
Combine multiple CSV files into one document.
Drag and drop CSV files here
A CSV (Comma-Separated Values) file is one of the most universal data formats — every spreadsheet app, database, and analytics tool can read it. CSV merging is the process of combining two or more CSV files into a single unified file. This is essential when you receive data exports from different sources, different time periods, or different departments and need to analyze them together. Instead of manually copying and pasting rows between spreadsheets, a CSV merger automates the process and ensures columns align correctly.
CSV merging is useful in a wide range of scenarios:
FileNaut automatically detects the header row of each CSV file you upload. Columns with matching headers are aligned into the same column in the merged output. If one file has a column that another file does not, the merged output includes that column with blank cells for files that lack it. This means no data is ever lost during the merge — every column and every row from every source file appears in the result.
CSV is a universal plain-text format that works in any spreadsheet application — Excel, Google Sheets, LibreOffice, Numbers, and more. FileNaut outputs a clean, standards-compliant CSV file that opens anywhere. If you need an Excel-native .xlsx file with formatting, formulas, or multiple sheets, merge your CSVs first in FileNaut and then use the CSV to Excel converter to get the format you need. This two-step workflow gives you the best of both worlds: reliable merging plus Excel compatibility.