CSV Splitter

## Split Large CSV Files Into Smaller Chunks The CSV Splitter breaks one oversized CSV into several smaller files based on a row count you choose. Instead of wrestling with a multi-gigabyte export that crashes your spreadsheet app, you get a set of manageable parts you can open, share, or import one at a time. All splitting happens locally in your browser. Your file is never uploaded to a server, which matters when the data contains customer records, financial exports, or anything covered by a confidentiality or compliance requirement. ## When to Use It Common reasons to split a CSV by rows: - A file exceeds the row limit of Excel or Google Sheets (Excel caps at 1,048,576 rows). - An import tool, API, or database loader rejects files over a certain size. - You want to batch-process a dataset or hand pieces to different people. - Email or upload size limits block one large attachment. ## How Row-Based Splitting Works You set a maximum number of data rows per output file. The tool reads the source, keeps the header line, and writes consecutive blocks of rows into numbered files until the whole dataset is covered. Each chunk stays a valid, self-contained CSV. ### Tips for Clean Output - Confirm whether your downstream tool expects the header repeated in every file; row-count splitting keeps each part independently usable. - Choose a row count that fits the target system rather than an arbitrary number. - Watch for embedded line breaks inside quoted fields, which some naive splitters miscount. ## Privacy and Local Processing Because everything runs client-side, no data leaves your machine. There is nothing to delete from a server afterward and no transfer to intercept. For inspecting the data before or after splitting, the [CSV Viewer](/tools/developer/csv-viewer) lets you sort and filter rows in an interactive table.