CSV Joiner - Merge Multiple CSV Files Online
Combine and merge multiple CSV files into one unified dataset. Perfect for consolidating data from different sources, merging exports, and combining spreadsheet files for analysis.
Why Use CSV Joiner?
- Consolidate Data: Merge datasets from multiple files
- Header Management: Automatically handles duplicate headers
- Preview Results: See merged data before download
- No Software: Works entirely in your browser
Common Use Cases
📊 Data Analysis
Combine monthly reports into yearly datasets.
📈 Sales Data
Merge sales data from multiple regions or stores.
📧 Email Lists
Consolidate contact lists from different sources.
🔄 Data Migration
Combine export files before importing to new system.
How to Use This Tool
- Add CSV Data: Paste CSV content for each file you want to merge.
- Configure Options: Choose delimiter and whether files have headers.
- Merge & Download: Click merge to combine files, preview, and download the result.
💡 Tip: If your CSV files have headers, enable "First row is header" to avoid duplicate header rows.
CSV Joiner
CSV Merging Options
Header Handling
- With Headers: First file's header is used, subsequent file headers are skipped
- Without Headers: All rows from all files are combined sequentially
- Column Matching: Files should have the same column structure for best results
Best Practices
- Ensure all CSV files use the same delimiter
- Make sure column count and order match across files
- Check that headers (if present) are identical in all files
- Remove any extra blank lines or spaces
- Verify data types are consistent across files
Common Issues
- Mismatched columns: Ensure all files have the same number of columns
- Different delimiters: All files must use the same delimiter (comma, semicolon, etc.)
- Encoding issues: Special characters may not display correctly
- Large files: For very large files, consider using desktop software
Example Merge
File 1:
name,score John,85 Jane,92
File 2:
name,score Bob,78 Alice,95
Merged Result:
name,score John,85 Jane,92 Bob,78 Alice,95
Related Tools
- CSV to JSON - Convert merged CSV to JSON
- CSV to HTML Table - Create HTML table from merged data
- JSON to CSV - Convert JSON to CSV format