Million Row CSV Copier

A CSV export with millions of rows, common from database dumps, analytics platforms, or system extracts, is too large to paste into Excel or most spreadsheet tools in one move, and manually splitting it yourself means writing a script or opening the file in a text editor to cut it apart.

Million by Million Rows Copier copies large CSV data in chunks automatically. Load your CSV by pasting with Ctrl+V or loading the file directly, click Start Copying Out, then use Copy Next Chunk to build and copy each million-row piece, ready to paste into Excel or any destination that accepts data through the clipboard.

Data is stored in a local SQLite database rather than memory once loaded, so working through a large CSV export in chunks stays fast and responsive regardless of how many rows the original file contained, up to 50,000,000 rows in a single session.

Each chunk includes the header row automatically and is saved to disk in your chosen format, CSV included, the moment it's copied, so you end up with both the clipboard paste and a permanent file record of every piece.

Chunk size defaults to 1,000,000 rows, fitting under Excel's per-sheet limit, but adjusts anywhere from 1 to 10,000,000 to match whatever destination or import limit you're actually working around.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your CSV 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 CSV data with Ctrl+V or load the CSV file directly.
3. Click Start Copying Out to lock the dataset in place.
4. Click Copy Next Chunk to build the first million-row piece.
5. Paste that chunk into Excel or your destination.
6. Click Copy Next Chunk for the next piece.
7. Repeat until the entire CSV file has been copied.
8. Review the auto-saved chunk 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.

• Copies large CSV files in chunks ready for Excel or any destination
• Load by pasting or by loading the CSV file directly
• Header row included automatically in every chunk
• Auto-saves each chunk to disk, CSV included
• Chunk size adjustable from 1 to 10,000,000 rows
• SQLite-backed storage handles datasets up to 50,000,000 rows
• 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