Split CSV & Excel Files Online - Free File Splitter

Splitting large data files is a common task for operations, finance, and data teams. Whether you need to break up a dataset that exceeds an import limit, distribute records across team members, or simply make a massive spreadsheet easier to work with, a file splitter saves hours of manual copy-paste work.

Why Split CSV or Excel Files?

• Import row limits: Many platforms (Salesforce, HubSpot, Shopify, QuickBooks) cap CSV imports at 5,000–50,000 rows. Splitting your file into chunks lets you upload in batches without errors.
• Email attachment limits: Email providers typically cap attachments at 10–25 MB. Splitting a large spreadsheet into smaller parts makes it easy to share via email.
• Performance: Excel slows down significantly with files over 100,000 rows. Smaller files open faster and are easier to filter and sort.
• Team distribution: Divide a lead list or task sheet among team members by splitting into equal-sized chunks.
• Database migrations: Large data migrations are safer when executed in smaller batches, making it easier to validate each chunk before proceeding.

Step-by-Step: Splitting a File

1. Upload your file — Drag and drop or click to select a CSV, XLS, or XLSX file from your computer.
2. Set the row limit — Choose how many rows each output file should contain (e.g., 1,000 rows per file).
3. Split — Click the split button. The tool processes your file entirely in-browser; nothing is uploaded to a server.
4. Download — Download individual chunks or all files at once as a ZIP archive. Each chunk includes the original header row.

Header Preservation Explained

When you split a spreadsheet, the first row (header row) contains your column names. Without proper handling, only the first chunk would have headers, and every subsequent file would start with data — causing import failures and confusion. Our splitter automatically copies the header row to every output file, so each chunk is ready for immediate use.

CSV vs. Excel: Which Format to Use?

CSV (Comma-Separated Values) is a plain-text format supported by virtually every data tool. It is lightweight, easy to parse, and works well for simple tabular data. Excel (XLS/XLSX) supports multiple sheets, formatting, formulas, and data types. Use CSV when your downstream tool expects it (most import tools do), and use Excel when you need to preserve formatting or work across multiple sheets.