Large Row Batch Copier

Automating the movement of millions of rows doesn't have to mean writing a script; it can mean a repeatable, click-driven process where the hard parts, building each chunk correctly and saving it to disk, happen automatically every single time.

Million by Million Rows Copier copies millions of rows with that kind of automation built in. Once you load your data, by pasting with Ctrl+V or loading a file, and click Start Copying Out, every subsequent Copy Next Chunk click automatically builds the next piece, copies it to your clipboard with the header included, and saves it to disk.

Nothing about the chunk-building or saving process needs manual configuration each time, the app remembers your chunk size and output format settings, so working through dozens of batches is a matter of clicking Copy Next Chunk, pasting, and repeating.

Behind the automation, background threads handle the actual chunk building and disk saving, running in parallel via independent SQLite connections, so the automated process stays fast even as you work through a large dataset.

Batch size defaults to 1,000,000 rows but adjusts anywhere from 1 to 10,000,000, and the app handles datasets up to 50,000,000 rows total, automating the same reliable process regardless of scale.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with nothing uploaded during processing. 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. Set your batch size and auto-save formats once.
5. Click Copy Next Chunk to automatically build and copy each batch.
6. Paste each batch into your destination.
7. Repeat clicking Copy Next Chunk through the rest of the dataset.
8. Review the automatically saved batches 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.

• Automatically builds, copies, and saves each batch on click
• Settings configured once apply to every subsequent batch
• Parallel background threads keep automation fast
• Header row included automatically in every batch
• Batch size adjustable from 1 to 10,000,000 rows
• Handles datasets up to 50,000,000 rows in one session
• 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