CSV Row Batch Copier

A large CSV file moved in batches, rather than all at once, gives every destination application, Excel, a database tool, another spreadsheet program, a fair chance of actually accepting the data without freezing or rejecting rows past its limit.

Million by Million Rows Copier copies large CSV files in batches by loading the whole file once, by pasting with Ctrl+V or loading it directly, then handing the data out through Copy Next Chunk, one manageable batch at a time, by default 1,000,000 rows.

Every batch includes the header row on the clipboard automatically, so each piece you paste is a self-contained, properly labeled table, whether it's the first batch of the session or the last.

Batch size adjusts anywhere from 1 to 10,000,000 rows, letting you tune the size of each piece to whatever your specific destination can comfortably handle, and each batch is saved to disk automatically the moment it's copied.

Because the CSV file is stored in a local SQLite database once loaded, working through many batches in sequence stays fast, without the slowdown that comes from repeatedly re-reading a large file from disk.

Everything runs locally on your PC, aside from a one-time license check. Loading, batching, and exporting all happen offline, with your CSV file never uploaded anywhere. Data analysts and engineers moving large extracts between tools, database administrators handing off query results, finance and accounting teams transferring big ledgers, operations and reporting staff assembling data from many sources, and anyone who has ever tried to paste more rows into Excel than it was willing to accept, all use the same underlying workflow. Virtual rendering keeps the loaded-data view smooth even at the upper end of the app's capacity, and every worker thread runs its own SQLite connection in WAL mode, so nothing here depends on your PC having an unusual amount of memory to spare.

1. Install Million by Million Rows Copier on your Windows PC.
2. Paste your CSV data with Ctrl+V or load the file directly.
3. Click Start Copying Out to lock the dataset in place.
4. Click Copy Next Chunk to build the first batch.
5. Paste that batch into your destination.
6. Click Copy Next Chunk for the next batch.
7. Repeat until the entire CSV file has been copied.
8. Review the auto-saved batches in your output folder.
9. Use Re-copy Current Chunk if your clipboard gets overwritten mid-paste.
10. Click Open Output Folder to review everything you've saved so far.

• Copies large CSV files in manageable, repeatable batches
• Header row included automatically in every batch
• Batch size adjustable from 1 to 10,000,000 rows
• Auto-saves each batch to disk as it's copied
• SQLite-backed storage avoids repeated slow file reads
• Handles CSV files up to 50,000,000 rows in one session
• Runs fully offline aside from a one-time license check
• One-time purchase for Windows, with Gumroad license activation
• Choose your own output folder, or use the default under My Documents
• Works with files on local drives, external drives, and network shares