CSV Merger

A CSV merger helps you combine multiple files into a single dataset without doing manual copy and paste. This tool supports two common approaches: vertical merging, which appends rows from several CSV files, and horizontal merging, which joins columns from different files by using a shared key column.

When to use each mode

Vertical stacking is useful when several files share the same kind of records, such as monthly exports or separate survey batches. Horizontal joining is better when each file contains different details about the same item, customer, or order and you need to bring those fields together by a shared identifier.

What the tool handles

The merger detects headers across uploaded files, previews the result, and fills missing values with empty cells when columns do not line up perfectly. That makes it practical for real-world exports where the file structures are similar but not identical.

Because the merge runs in the browser, you can consolidate CSV files privately before sending the cleaned result to a spreadsheet, CRM, reporting workflow, or internal system.