CSV Column Merger & Concatenator

Merge and concatenate two or more CSV columns into a new column with a custom separator.

How It Works & Processing Standards

Merge and concatenate two or more CSV columns into a new column with a custom separator.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Desktop max file size: 50MB
  • Mobile max file size: 20MB

CSV Column Merger & Concatenator is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use CSV Column Merger & Concatenator

  1. 1
    Paste CSVInput your CSV table.
  2. 2
    Select ColumnsChoose the columns to merge, separator (e.g. space, hyphen), and new column name.
  3. 3
    Export TableCopy or download the CSV with the merged column.

Examples

Merge Names
Input: first_name,last_name John,Smith Alice,Walker
Result: Merge with space -> [full_name]: full_name John Smith Alice Walker

Common Use Cases

  • Combining first and last name columns into a single full name field
  • Creating composite key identifiers from multiple columns (e.g. state-city-zip)
  • Building full street addresses from separate street, city, and zip columns

Frequently Asked Questions (FAQ)

Can I keep or delete the original source columns after merging?

Yes, you can toggle whether to retain or drop the original columns after generating the merged column.

Have feedback or ideas for this tool? Suggest & Inquire →