CSV File Splitter

Splitting by rows is the most common reason anyone needs a CSV splitter in the first place: a file has too many rows for the tool you need to open it in, whether that's Excel's 1,048,576-row limit or an import tool with its own row ceiling, and it needs to become several smaller files, each under that limit.

Turbo CSV Splitter's Number of Rows method handles this directly: every output file gets the same number of data rows, up to a ceiling of 1,000,000 rows per file. Enter, say, 500,000 and a five-million-row export becomes ten tidy files, each independently valid with the header repeated at the top.

This is the go-to method when you simply need pieces that open cleanly in Excel without hitting its row ceiling, or that stay under an import tool's row limit. Because the split is purely row-count based, every output file except possibly the last is exactly the size you specified.

Splitting by rows works on files of any size thanks to the streaming engine, which processes row by row rather than loading the whole file into memory, so a multi-million-row export splits reliably without running out of memory.

Preview reports the total row count and an estimate of how many output files the split will produce, so you can confirm your row count setting will produce the number of files you expect before running the actual split.

Everything runs offline, on your own PC, so splitting a file by rows never requires uploading it anywhere, keeping the data in your CSV private throughout. Delimiter and encoding both default to Auto 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 CSV file directly in a spreadsheet program.

1. Install Turbo CSV Splitter on your Windows PC.
2. Browse to or drag and drop your CSV file.
3. Choose your output folder.
4. Select the Number of Rows split method.
5. Enter your desired rows per file, up to 1,000,000.
6. Run Preview to confirm the row count and estimated output files.
7. Click Start Split and monitor progress.
8. Open the output folder once the split completes.
9. Adjust the parallel worker slider (1-128) if compressing many output parts.
10. Check the status bar for the final row count and file count summary.

• Splits by a fixed row count, up to 1,000,000 rows per file
• Header repeated at the top of every output file
• Every part independently valid and directly openable
• Works on files of any size via streaming
• Preview estimates the resulting number of files
• Live speed and ETA during the split
• Runs fully offline with no upload 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