Data Utility
CSV Splitter
Split one large CSV into multiple files by row count, file size, number of files, or column value.100% Client-Side. Your data never leaves your browser.
Data Utility
Why split a CSV?
Upload limits, row caps, and per-tenant imports all force big files into smaller pieces. This tool keeps the header row in every output file and bundles them into a single ZIP, so each piece imports cleanly on its own.
- Split by row count, file size, file count, or column
- Header row kept in every output file
- Downloads as a single ZIP (or file-by-file)
Splitting to work around an importer's row limit?
If you are slicing files just to squeeze past an upload cap, the real fix is a pipeline that maps, validates, and loads the whole file at once. DataFlowMapper handles large files and reusable templates so you stop splitting by hand every month.
Client-Side Processing ArchitectureSecure
Your data never leaves your device. All processing happens locally in your browser's memory via WebAssembly/JavaScript. This ensures complete data sovereignty and compliance with GDPR, HIPAA, and SOC2 standards as no files are uploaded to our servers.
Frequently Asked Questions
How do I split a large CSV file?▼
Paste or upload your CSV, choose a split mode (by row count, by number of files, by max file size, or by a column's value), and click Split. The tool generates the smaller files in your browser and lets you download them all as a single ZIP, or one at a time.
What are the split modes?▼
Four: by row count (a fixed number of rows per file), by number of files (split as evenly as possible into N files), by max file size (each piece stays under a KB or MB target), and by column value (one file per distinct value in a column you pick, for example one file per region or per customer).
Does every output file keep the header row?▼
Yes. The header row from your original file is written to the top of every output file, so each piece is a valid, self-contained CSV you can open or import on its own.
Will it preserve leading zeros and long ID numbers?▼
Yes. Values are kept exactly as they appear in your file, so leading zeros, ZIP codes, and account numbers are never reformatted or turned into numbers.
Is my data secure?▼
Yes. Splitting runs 100% in your browser, including the ZIP packaging. Your file is processed locally in memory and is never uploaded to our servers.
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