Large Excel File Splitter

An Excel workbook that's grown too large to open smoothly, or that's hit its roughly 1,048,576-row-per-sheet limit, needs to be split before it's usable again, ideally without requiring you to manually copy ranges into new files one at a time.

Turbo Large Data Splitter splits large Excel workbooks using seven methods, with XLSX workbooks containing multiple sheets showing a sheet selector automatically, so you can choose exactly which sheet to split rather than the tool guessing or requiring the first sheet by default.

Splitting by Number of Rows removes the row-per-sheet ceiling directly, since each output part becomes its own workbook, while Column Value writes one output file per distinct value in a chosen column, useful for splitting a workbook by department, region, or category.

Legacy .xls files are read whole into memory rather than streamed, which is fine because .xls itself caps at 65,536 rows, well within typical memory limits, while modern .xlsx files stream in a single pass for larger workbooks.

Output format is independent of input, so a large Excel workbook can be split directly into CSV, JSON, TXT, TSV, or XML files if that better suits your next step, with conversion happening in the same pass as the split.

Everything runs offline, entirely on your own Windows PC, so splitting a large Excel workbook containing sensitive business data never requires uploading it to an external service. Delimiter and encoding both default to Auto for relevant formats and are detected directly from the file itself, so you only need to touch them in the rare case detection gets something wrong, an unusual delimiter or a legacy encoding, for example. This makes the tool equally useful for data analysts working with irregular exports, developers automating a recurring pipeline step, e-commerce teams distributing catalog data by category, and anyone else who regularly runs into the practical limits of opening a large data file directly in a spreadsheet program.

1. Install Turbo Large Data Splitter on your Windows PC.
2. Browse to or drag and drop your XLSX or XLS file.
3. Choose a specific sheet if the workbook has multiple sheets.
4. Choose your output folder and format.
5. Select the split method matching your goal.
6. Run Preview to confirm the setup.
7. Click Start Split and monitor progress.
8. Open the output folder once the split completes.
9. Adjust the parallel worker slider if compressing many output parts.
10. Check the status bar for the final row count and file count summary.

• Sheet selector for multi-sheet XLSX workbooks
• Splits large workbooks using seven distinct methods
• Removes Excel's roughly 1,048,576-row-per-sheet ceiling
• Handles both modern XLSX and legacy XLS files
• Convert output to CSV, JSON, TXT, or other formats
• Preview and live status bar for full visibility
• Runs fully offline with no uploads required
• One-time purchase for Windows, with Gumroad license activation
• Compression options: uncompressed, per-part ZIP/gzip, or a single bundled archive
• Works with files on local drives, external drives, and network shares