Million Row Data Processor

Processing a large dataset covers more ground than just moving it somewhere; it means loading it reliably, breaking it into usable pieces, and getting those pieces into whatever format and destination your actual workflow requires.

Million by Million Rows Copier processes large datasets across all of these steps. Loading accepts 33 input formats, either pasted with Ctrl+V or loaded from a file, storing everything in a local SQLite database that keeps the app responsive regardless of dataset size.

Once loaded, Copy Next Chunk processes the dataset into million-row pieces by default, each with the header row included automatically, ready either for a manual clipboard paste or as a saved file in your chosen output format.

For processing the entire dataset in one operation rather than piece by piece, Export Everything As handles that too, writing the full dataset to disk with automatic splitting based on chunk size, XLSX into multiple sheets, other formats into numbered part files.

Background threads handle the actual processing work throughout, loading, chunk building, and exporting all happen without locking up the interface, keeping the whole workflow usable even for datasets at the upper end of the app's 50,000,000-row capacity.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your dataset never uploaded anywhere 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 in any of 33 formats.
3. Click Start Copying Out to lock the dataset in place.
4. Choose your chunk size and desired output formats.
5. Click Copy Next Chunk to process each piece.
6. Paste chunks into your destination, or use Export Everything As.
7. Review the processed output in your chosen formats.
8. Check your output folder for the saved files.
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.

• Processes datasets from loading through to final export
• 33 input formats and six output formats supported
• SQLite-backed storage keeps processing responsive
• Header row included automatically in every processed chunk
• Export Everything As for complete, one-shot processing
• Handles 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