Massive Dataset Copier

A massive dataset, tens of millions of records deep, needs a copying process that doesn't degrade or become unreliable as you work further into the session, the tenth chunk should be just as fast and correct as the first.

Million by Million Rows Copier copies massive datasets automatically through a process that stays consistent regardless of how many chunks you've already produced. Load your data once, by pasting with Ctrl+V or loading a file in any of 33 supported formats, and Copy Next Chunk handles every subsequent piece the same reliable way.

The underlying SQLite-backed storage means chunk building doesn't slow down as you progress through a massive dataset; each chunk is queried fresh from the database rather than accumulated in memory, keeping performance consistent from the first million rows to the fiftieth.

Every chunk includes the header row automatically and is saved to disk in your chosen format the moment it's copied, so an automatic, repeatable session leaves you with both clipboard pastes and a complete file backup of the massive dataset.

Chunk size adjusts anywhere from 1 to 10,000,000 rows, and the app handles massive datasets up to 50,000,000 records in a single session, automating the same reliable process regardless of the specific scale involved.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your massive 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 automatically build and copy each piece.
5. Paste each chunk into your destination.
6. Repeat clicking Copy Next Chunk through the entire dataset.
7. Monitor consistent performance throughout the session.
8. Review the auto-saved chunks 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.

• Consistent performance regardless of how many chunks copied
• Each chunk queried fresh from SQLite, not accumulated in memory
• Header row included automatically in every chunk
• Auto-saves each chunk to disk as it's copied
• Chunk size adjustable from 1 to 10,000,000 rows
• Handles massive datasets up to 50,000,000 records
• 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