FREE TOOL
Free Online CSV splitter
Break a large CSV into smaller files that each keep the header row. It is free, it runs entirely in your browser, and nothing uploads to our servers.
Told your file is too big?
If a website would not accept your upload, a program choked on the file, or Excel refused to open it, breaking the file into smaller pieces is usually the fix, and that is all this tool does. You do not need to know anything technical to use it.
Drop your file in, say how many rows you want in each smaller file, and download the pieces. Each piece is a normal CSV with the same column headings at the top, so they open and behave just like the original, only smaller. Your data is copied across exactly, nothing is changed or lost, there is no account to create, and it is free.
What is a CSV file?
A CSV (comma-separated values) file is a plain-text table. Each line is one row, and commas mark where one column ends and the next begins. It is the most common way to move data between tools, which is why almost everything you export from, databases, analytics platforms, CRMs, accounting software, exports as a CSV. The catch is that a CSV has no viewer of its own, so a large one usually has to be opened in something heavier like a spreadsheet.
Why split a large CSV?
When a CSV is exported from a real system it can easily run to millions of rows, and files that big get awkward to handle. Excel will not load anything past 1,048,576 rows, and it quietly keeps the first million while throwing the rest away, so you end up working with a partial file without realising it. Even below that limit, a large CSV can take minutes to open or crash the program outright.
Other systems set their own ceilings too: an import tool that only accepts files under a certain size, an email attachment limit, an upload form that times out on anything large. Splitting one oversized CSV into several smaller parts gets you under all of those limits at once, while keeping every row intact.
How it works
Drop your file in and the tool streams through it to count the rows and read the header, without uploading anything. Choose how many rows you want in each part and it tells you how many files that will produce. Every part is written with the original header row at the top, so each one opens as a complete, valid CSV on its own. Download them one at a time or all together.
Questions
Does each split file keep the header row?
Yes. The original header is prepended to every output file so each one is a valid, self-contained CSV.
Will splitting change any of my data?
No. The tool only divides the rows into smaller groups. Every value is copied exactly as it was, and the header is repeated at the top of each part. Nothing is reformatted or rounded.
Is the file uploaded to split it?
No. Splitting happens right inside your browser, so your data never leaves your machine and the file is never uploaded to us.
How many files can I split into?
Up to 30 parts per split. If your chosen rows-per-file would exceed that, the tool tells you the minimum to use.
Is the CSV splitter free?
Yes, completely free. There is no sign-up, no watermark, and nothing to install. It runs in your browser.
Other free CSV tools: the CSV viewer opens large files for a quick look, and the CSV to Excel converter turns them into spreadsheets.
Want to query this file instead?
Skip the split — Sifar Data handles multi-GB files natively in your browser.