Large File Data Copier

A huge file, whether it's a database export, a Word document with an enormous table, or an HTML page full of tabular data, holds information that often needs to move somewhere else, but the file's sheer size makes a direct copy operation impractical.

Million by Million Rows Copier copies data from huge files by loading the file once, in any of 33 supported formats, and then delivering the contents piece by piece through Copy Next Chunk, each piece sized to be manageable regardless of how large the original file was.

Loading happens with a visible progress bar, so a huge file being read doesn't leave you staring at an unresponsive window, and once loaded, the data lives in a local SQLite database rather than memory, keeping the app fast for every subsequent chunk you copy.

Every chunk includes the header row automatically, so data pulled from a huge file arrives at its destination as a complete, properly labeled table, and each chunk is saved to disk in your chosen format the moment it's copied.

Because the file is only read once during loading, and chunks are subsequently built from the local database, working through a huge file's contents chunk by chunk doesn't require repeatedly accessing the original file, keeping the process fast and consistent.

Everything runs locally on your PC, aside from a one-time license check. Loading, chunking, and exporting all happen offline, with your huge file 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. Load your huge file in any of 33 supported formats.
3. Watch the progress bar as the file loads.
4. Click Start Copying Out to lock the dataset in place.
5. Click Copy Next Chunk to build the first piece.
6. Paste that piece into your destination.
7. Repeat with Copy Next Chunk through the rest of the file.
8. Review the auto-saved pieces 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.

• Loads huge files once, in any of 33 supported formats
• Delivers file contents piece by piece afterward
• Visible progress bar during large file loading
• Header row included automatically in every piece
• SQLite-backed storage avoids repeated file access
• Handles files 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