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Split Text or CSV Files

Split large text or CSV files by number of rows, file size, or repeating header.

100% Secure - your files are processed in your browser and never sent to a server.
Drop your file hereor click to browseSupports CSV, TSV, or TXT files (.csv, .tsv, .txt) (Max 100MB)

How to use the Split Files tool

  1. Load your file: Drag and drop your text or CSV file, choose a file from your file explorer, or paste content directly into the paste area.
  2. Choose split method: Select how to split: by number of rows, by number of equal parts, or by approximate file size.
  3. Set split parameters: Enter the value for your chosen split method (e.g., 100 rows per file, 5 parts, or 50000 bytes).
  4. Configure header option: Toggle whether to keep or prepend the header row in each split file (for CSVs).
  5. Split and download: Click the "Split File" button. Each split file is listed with its name and size for individual download.

Frequently asked questions

Is it safe to use Split Files with sensitive or confidential data?
Yes, completely. All processing done by Split Files runs 100% client-side inside your local web browser using a background Web Worker thread. Your data is never uploaded, transmitted, or stored on any server, not even temporarily.
What is the maximum file size Split Files can handle?
Split Files supports files up to 100 MB. Because all parsing happens inside your browser's memory rather than on a server, performance scales with your computer's available RAM. The Web Worker architecture keeps the UI fully responsive even during heavy processing.
How does Split Files process my data without uploading it?
Split Files uses modern browser File and Blob APIs alongside battle-tested open-source libraries (such as PapaParse and SheetJS) bundled directly into the page. When you load a file or paste data, the browser reads it into local memory and the conversion runs entirely inside a sandboxed Web Worker thread. No network call is ever made.
Do I need to install anything to use Split Files?
No installation, browser extension, or plugin is required. Split Files runs as a standard web page inside any modern browser. Simply open it, load your data, and download the output. Nothing to install and nothing to uninstall.
Does Split Files work offline after the page has loaded?
Yes. Once Split Files has finished loading in your browser, the conversion engine itself requires no active internet connection. You can disconnect from the network and continue converting files; all processing stays fully on-device.

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