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CSV Merge & Split Tool

Combine two CSV files by appending their data rows into one export, or split one large CSV into smaller parts by row count. Merge does not match, reconcile, or deduplicate records.

Free
1Upload 2Configure 3Process 4Download
Merge Two CSV Files

Combines File A and File B into one output. If headers are enabled, only the first header is kept.

File A
First file in the merged output
File B
Appended after File A
Split One CSV File

Splits a large file into multiple output parts by row count.

File to split
One output file per chunk

Tool information

What it does

Combine two CSV files by appending their data rows into one export, or split one large CSV into smaller parts by row count. Merge does not match, reconcile, or deduplicate records.

How it works

  1. Upload one or more CSV files
  2. Choose merge or split mode and set parameters
  3. Run the tool to generate outputs
  4. Download the merged file or split parts

Output / privacy

Useful for large datasets and bulk imports.

Uploads and generated files are stored privately and retained for the configured retention period.

Header and row handling

When the header option is selected, merge writes the first file’s header once and appends data rows from both files. Split repeats the source header in every generated part and applies the chosen row count to data rows.

FAQ

Will the tool preserve headers?
Yes. Outputs are generated with consistent headers so imports remain predictable.
What is the best split size?
Choose a size that matches your dialer or CRM import limits and your operational routing needs.
Are uploads private?
Yes. Uploads and outputs are stored privately and served via protected download links.