CSV Splitter

The CSV Splitter is a free online tool that split large csv files into smaller chunks by row count, number of files, or column value. download individually or as a zip archive.. It runs entirely in your browser with no installation or sign-up needed.

Three: by row count (N rows per file), by file count (evenly distributed), or by column value (one file per unique value in a chosen column).

Yes, when First row is header is enabled, the header row is repeated at the top of every split file.

Yes — Download All as ZIP gives a single archive containing all split CSVs, or download each individually.

Yes, the CSV Splitter is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The CSV Splitter processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the CSV Splitter is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the CSV Splitter in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The CSV Splitter works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Both modes slice a CSV into sequential pieces, but they fix different variables. By row count, you set how many rows each file holds — pick 10,000 and a 45,000-row export becomes five files, four with 10,000 rows and a last one with the remaining 5,000. By file count, you set how many files you want instead, and the rows are spread as evenly as possible. If the total doesn't divide cleanly, the remainder is handed out one row at a time to the earliest files, so no two files differ by more than a single row. Choose row count when the other system has a hard per-upload ceiling; choose file count when you want a fixed number of balanced batches, for example to hand one to each teammate. Paste your CSV above and toggle between the modes to compare the preview instantly.

It uses a quote-aware parser rather than naively splitting on the delimiter, so values wrapped in double quotes are read as single fields even when they contain commas, line breaks, or escaped doubled quotes (""). That means an address like "123 Main St, Apt 4" stays in one column instead of being torn into two, and a multi-line note inside quotes is kept intact as one cell. On the way out, any field that contains a comma, a quote, or a newline is automatically re-quoted to standard CSV rules, so every split file stays well-formed and reopens correctly in Excel, Google Sheets, or another importer. The parser also understands both Windows (CRLF) and Unix (LF) line endings. Drop your file above and the preview will reflect the correctly parsed rows before you download anything.

Yes. The tool inspects the beginning of your file and tests four common delimiters — comma, semicolon, tab, and pipe — choosing the one that divides rows most consistently. This matters because many European exports use semicolons (since the comma is a decimal separator there) and tab-separated values are common from databases and spreadsheets. Because detection is automatic, you don't have to declare the format up front; just paste the data or upload a .csv, .tsv, or .txt file and the parser adapts. Whatever the input delimiter, the split files are written out as standard comma-separated CSV, which is the most widely accepted format for re-importing. If a file looks misparsed, it's usually because the first rows are inconsistent — load the built-in sample to see how clean detection behaves, then drop in your own data.

Use the By Column Value mode. Instead of slicing rows sequentially, it reads a column you choose and writes one separate file for every unique value found in it. Splitting a contacts export on a "Region" column gives you a distinct CSV for each region; splitting orders on "Status" gives one file per status. The resulting files are labelled and sorted alphabetically by their value, and each one keeps the header row when "First row is a header" is enabled, so every group opens as a complete, self-describing spreadsheet. This turns a single master file into ready-made per-category datasets without manual filtering, sorting, or copy-pasting. Rows with a blank value in that column are collected together so nothing is lost. Pick your grouping column above and the preview shows exactly how many files each value will produce before you download.

All splitting runs locally in your browser using your own device's memory, so there's no upload step and no server-side size cap to negotiate — the practical limit is how much your browser and machine can hold in RAM at once. Modest files of a few thousand to a few hundred thousand rows split near-instantly on a typical laptop, while extremely large files (many millions of rows) can strain memory because the full dataset is parsed in one pass. Because nothing leaves your computer, a sensitive customer list or financial export stays private the entire time. The preview reports total rows, file count, and the minimum and maximum rows per file so you can confirm the result before downloading each piece individually or grabbing them all in one ZIP. Paste or drop your file above to see how quickly it handles your data.