CSV Large Data Copier

A huge CSV dataset, the kind that makes text editors sluggish and spreadsheet programs refuse to open the file at all, needs a copying approach that doesn't depend on holding the entire file in memory just to get started.

Million by Million Rows Copier copies huge CSV datasets by storing them in a local SQLite database rather than memory. Load your CSV, by pasting with Ctrl+V or loading the file directly, and the app builds each chunk on demand from that database rather than keeping the whole dataset resident in RAM.

Copy Next Chunk produces each piece, by default 1,000,000 rows, with the header row included automatically, and saves it to disk in your chosen format the moment it's copied, so working through a huge CSV dataset stays reliable from the first chunk to the last.

Background threads handle all the heavy processing, loading, chunk building, and saving, so the interface stays responsive even while the underlying dataset is genuinely huge, up to 50,000,000 rows in a single session.

Chunk size adjusts anywhere from 1 to 10,000,000 rows, letting you tune the size of each piece to whatever your destination or downstream process actually needs, without any impact on the reliability of the underlying storage.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your CSV 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 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 piece.
5. Paste that piece into your destination.
6. Click Copy Next Chunk for the next piece.
7. Repeat until the entire huge CSV dataset has been copied.
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.

• Stores huge CSV datasets in local SQLite, not memory
• Chunks built on demand rather than all at once
• Header row included automatically in every chunk
• Background threads keep the interface responsive
• Chunk size adjustable from 1 to 10,000,000 rows
• Handles CSV 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