Copy Data by Row Count

Sizing a copy operation by exact row count gives you precise control over how a large dataset gets divided, rather than relying on a fixed default that may or may not match what your specific destination or downstream process actually needs.

Million by Million Rows Copier copies data by row count through its adjustable chunk size setting. Load your dataset once, by pasting with Ctrl+V or loading a file, set the exact row count you want per copy operation, anywhere from 1 to 10,000,000, then click Start Copying Out.

From there, Copy Next Chunk produces exactly that many rows per copy, with the header row included automatically, so you always know precisely how much data each clipboard operation contains before you even paste it.

Each row-count-based chunk is also saved to disk automatically in your chosen format the moment it's copied, giving you a permanent record that matches your exact row count setting throughout the session.

Because your row count setting locks in once you start copying, every chunk in the session stays the same exact size, except possibly the last, which holds whatever rows remain if the total doesn't divide evenly.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your data 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 data with Ctrl+V or load a file.
3. Set your exact row count per copy, from 1 to 10,000,000.
4. Click Start Copying Out to lock the row count in for the session.
5. Click Copy Next Chunk to copy exactly that many rows.
6. Paste each chunk into your destination.
7. Repeat until the entire dataset has been copied.
8. Review the auto-saved files 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.

• Precise control over exactly how many rows each copy contains
• Row count adjustable from 1 to 10,000,000
• Header row included automatically in every copy
• Auto-saves each copy to disk in your chosen format
• Row count locked in for consistency once copying starts
• Handles datasets up to 50,000,000 rows total
• 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