CSV Splitter
Split one large CSV file into smaller files by row count and download them all as a ZIP archive. Free, no signup, works in your browser.
Everything runs inside your browser — your file is never uploaded to a server.
About this tool
Choose a CSV file and set how many rows each output file should contain, and this tool slices the data into evenly sized chunks while repeating the header row in every piece. It's built for situations where a downstream tool caps upload size, an email attachment limit is too small, or a teammate only needs a portion of a dataset. The splitter preserves quoting and encoding exactly as in the source file, so no data is corrupted between chunks. Once processed, every chunk is packaged into a single ZIP file you can download in one click, with clear sequential file names like part-1.csv, part-2.csv and so on. Because splitting happens locally with JavaScript, even multi-megabyte exports from a database or spreadsheet are handled instantly without waiting on a server.
How to use this tool
1. Choose your CSV
Select the large CSV file you want to split.
2. Set rows per file
Enter how many rows each output file should contain.
3. Split
Click split to generate the chunked files instantly.
4. Download ZIP
Download all split files bundled together as a single ZIP.
Why use this tool
Large CSV exports often exceed upload limits for email, import tools or third-party services. This splitter breaks one big file into manageable, header-preserved chunks in seconds, saving you from manually copying rows into separate spreadsheets or writing a script just to divide a dataset.
Tips & best practices
- Pick a row count that matches your target system's upload limit to avoid re-splitting later.
- Rename the ZIP after downloading if you plan to keep multiple split batches organized.
- Double check the last chunk, since it may contain fewer rows than the others.
Common use cases
- Breaking a huge database export into pieces small enough for an import tool's upload limit.
- Dividing a mailing list into batches for different email campaigns.
- Splitting a CRM export so several teammates can work on different portions.
- Preparing chunked accounting data for separate monthly reviews.
- Reducing a dataset's size before sending it as an email attachment.
Frequently asked questions
Does every chunk keep the header row?
Yes, the header row is repeated at the top of every split file so each piece stays usable on its own.
How are the files delivered?
All chunks are bundled into one ZIP archive so you can download everything with a single click.
Can I choose the exact number of rows per file?
Yes, you set the row count per chunk and the tool calculates how many files are produced.
Will quoted fields or special characters be corrupted?
No, quoting, delimiters and encoding are preserved exactly as in your original file.
Is my file uploaded to a server to be split?
No, the splitting happens entirely in your browser using JavaScript.
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