Free CSV Merger — Combine Multiple CSV Files
Upload up to 10 CSV files and merge them into one — stack rows together, even if schemas differ. No upload to servers. No signup. No limits.
Who uses CSV Merger?
Real teams solving real problems — see if your use case is here.
Operations Manager
Logistics / OperationsTwelve regional teams submit weekly activity reports as separate CSV files. Consolidating them in Excel every Monday means 2 hours of open-copy-paste-fix cycles, often with header mismatches between regions.
Uploads all 12 files. Schema-union mode handles the 2 teams with extra columns. Downloads the merged file in 15 seconds. Monday morning reclaimed.
Finance Manager
Finance / AccountingQ1 expenses are split across three CSV exports — January, February, and March — from the expense management platform. The auditor needs a single consolidated file.
Stacks 3 files. 4,800 combined expense rows. Downloads one clean CSV. Audit-ready in under a minute.
Market Research Analyst
Market ResearchSurvey platform exports responses in monthly batches as separate CSVs. A cross-month trend analysis requires one unified dataset, but questions were added mid-year so schemas differ.
Merges 6 monthly files. Column-union mode fills missing answers with blanks for consistency. SPSS-ready dataset in minutes, not hours.
Sales Analyst
B2B SalesCRM exports active deals split by region — North, South, East, West — as four separate CSVs. The board wants a single pipeline report across all territories.
Merges all 4 files. 2,100 combined deal rows. Pivot table built on the merged CSV. Board report ready before the Monday meeting.
How to merge multiple CSV files into one
Upload your CSV files
Click to add your files — you can upload up to 10 at once. Each file is read locally in your browser. Nothing is uploaded to a server.
Review the file list
Each uploaded file shows its row count and column count. Remove any file by clicking the trash icon. The tool warns you if schemas differ between files.
Merge and download
Click Merge to combine all files. Rows are stacked in upload order. Missing columns across files are filled with blank values. Download the merged CSV instantly.