A single CSV file with hundreds of thousands or millions of rows quickly becomes difficult to work with. Spreadsheet programs slow down, email systems reject large attachments, and some import tools cap the number of rows they will accept at once. Splitting that one large file into several smaller files solves all three problems at once.
Turbo Large Data Splitter lets you split a CSV file by a fixed number of rows or by a target file size, so each output file stays within whatever limit your next step requires. The header row can be repeated automatically at the top of every split file, so each piece stays usable on its own.
- Install Turbo Large Data Splitter on your Windows PC.
- Open the app and load your CSV file, or drag it directly into the window.
- Choose to split by row count or by target file size.
- Enter the number of rows (or size in MB) you want per output file.
- Enable "Repeat header row" if each split file needs its own header.
- Click Split. The smaller CSV files are written to your chosen output folder, fully offline.
- 100% offline — your data never leaves your computer
- Split by row count or by file size, whichever fits your workflow
- Automatic header repetition on every output file
- Handles files with millions of rows without slowing down
- Works with CSV files of any delimiter (comma, semicolon, tab)
- No recurring subscription or row limits
How many rows can Turbo Large Data Splitter handle in one file?
The app is built to process CSV files with tens of millions of rows, using chunked reading so memory use stays low regardless of file size.
Will each split file keep the original column headers?
Yes, when the "Repeat header row" option is turned on, every output file gets its own copy of the header row so it can be opened and understood independently.
Can I split a CSV file by size instead of row count?
Yes, you can set a target file size in megabytes and the app will divide your data so each output file stays close to that size.
Ready to split your CSV files in seconds, fully offline?