Can I merge more than two columns?

Yes, select as many columns as needed in any order.

Are original columns kept?

Optional — keep or remove the source columns.

No. Everything runs locally in your browser.

Process files up to the browser memory limit.

Empty values are skipped — no doubled separators.

Combine two or more CSV columns into one with a custom separator. The safest way to process sensitive data with zero-upload,

Your files never leave your device. Processed locally. 100% private.

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Complete your task perfectly in just three straightforward steps.

Drop your CSV file.

Choose columns to merge and enter a separator.

Download the CSV with the new merged column.

Everything you need to know about the Column Merger.

Continue working with our suite of free data utilities.

Filter CSV rows by conditions on any column. Supports AND/OR logic. The safest way to process sensitive data with zero-upload

Transform wide CSV tables to long format. Convert column headers into row values. Processed entirely in your browser for 100%

Sort CSV rows by one or more columns in ascending or descending order. Fast, private, and secure browser-based tool with no s