CSV Splitter — Split Large CSV Files
Split large CSV files into smaller parts
Split a CSV file into multiple smaller files right in your browser. This free CSV splitter tool breaks up large CSV files by row count (every 10,000 rows, for example), by a target number of files, by maximum file size, or by the values in a column — one file per country, category, or customer.
The header row is copied into every part automatically, so each split file opens cleanly in Excel and imports correctly into databases, CRMs, and upload forms with row or size limits. All parts download together as a single ZIP.
Because splitting runs locally with no upload, your data never touches a server. The practical input size depends on your browser and available memory, while each output part can be sized for an email, spreadsheet, or import limit.
Drop your file here or browse from your device
Accepts CSV, TSV, TXT. Maximum input: 10 MiB. Files above this hard limit are rejected before local processing.
How to Use
- Upload your large CSV file (or paste CSV data)
- Choose a split method: by rows, by number of files, by file size, or by column value
- Set the parameters — e.g., 50,000 rows per file or a 10 MB size cap
- Preview how many parts will be created
- Download all split files together as a ZIP
Features
- Split by row count — every N rows becomes a new file
- Split into an exact number of files
- Split by maximum file size (great for upload and email limits)
- Split by column value — one file per unique value
- Header row preserved in every split file
- All parts packaged into a single ZIP download
- Private by design — splitting runs locally, no upload
Use Cases
- Break a huge export into parts small enough to email or upload
- Split a CSV that exceeds Excel’s 1,048,576-row limit into openable chunks
- Create one file per region, client, or category using split-by-column
- Feed batch imports that cap rows per upload (CRMs, ad platforms, ERPs)
- Chunk large datasets for parallel processing or review by different teams
Frequently Asked Questions
How do I split a CSV file into multiple files?
Upload the file, choose how to split it — every N rows, a target number of files, a maximum file size, or by the values in a column — and download all parts as a single ZIP. The header row is included in every part automatically.
Are headers included in each split file?
Yes. The header row is preserved at the top of every split file by default, so each part is a valid, self-contained CSV.
Can I split a very large CSV file?
Splitting happens locally with no server upload, but the whole input still has to fit in your browser’s available memory. The practical limit depends on your device and CSV structure; use row or size mode to produce parts that fit the destination system.
How do I open a CSV with more than 1,048,576 rows in Excel?
Excel cannot show more than 1,048,576 rows per sheet. Split the CSV into parts below that limit, then open each part separately. For inspection without converting, try the CSV Viewer; its practical limit depends on your browser and device.
Can I split a CSV by the values in a column?
Yes — choose split-by-column and one file is created per unique value, for example one file per country, department, or order status. Files are named after the value.
Is my data uploaded anywhere?
No. The file never leaves your device; splitting and ZIP packaging both run client-side in your browser.
Is the CSV splitter free?
Yes — free with no signup and no watermarks.
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