Multi-Million Row Copier

Some datasets go well beyond a single million rows, tens of millions of transaction records, sensor readings, or log entries accumulated over years, and copying them needs an approach genuinely built for that scale, not one that happens to technically work but struggles under the weight.

Million by Million Rows Copier copies extremely large, multi-million row datasets up to a total of 50,000,000 rows in a single session. Load your data once, by pasting with Ctrl+V or loading a file in any of 33 supported formats, and Copy Next Chunk hands the dataset out in pieces, by default 1,000,000 rows each.

A fifty-million-row dataset at the default chunk size means fifty chunks total, each built the same reliable way, with the header row included automatically and each piece saved to disk in your chosen format the moment it's copied.

Because your data is stored in a local SQLite database throughout the session, working through dozens of chunks in sequence stays fast, with parallel worker threads handling chunk building and disk saving simultaneously rather than one waiting on the other.

For a multi-million row dataset that doesn't need the manual paste workflow at all, Export Everything As writes the complete dataset to disk in one operation, automatically splitting the output by your chunk size.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your multi-million row dataset 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. Click Start Copying Out to lock the dataset in place.
4. Click Copy Next Chunk to build the first of many pieces.
5. Paste that piece into your destination.
6. Repeat with Copy Next Chunk through dozens of chunks if needed.
7. Or use Export Everything As for a complete, one-time export.
8. Review the auto-saved chunks or export 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.

• Genuinely built for datasets well beyond a million rows
• Handles up to 50,000,000 rows in a single session
• Header row included automatically in every piece
• Parallel worker threads for chunk building and saving
• Export Everything As for complete, one-shot processing
• Consistent, reliable chunk production across dozens of pieces
• 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