Split CSV into Multiple Files Online

Free browser-based CSV splitter — no install, works on Mac & Windows

How to Use
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Split CSV into Multiple Files Online

Split CSV files by row count or number of output files. Handles multi-GB files that Excel cannot open — with automatic header insertion, BOM preservation, and RFC 4180 compliance. Everything runs in your browser. No upload, no install.

How to Use
STEP1

Upload CSV File

Drag and drop your CSV file, or click "Select File" to load it.

STEP2

Specify Split Options

Choose "Split by Rows" or "Split by Files" and enter your target number. Turn on "Add header" to include column headers in every output file.

STEP3

Split and Download

Click "Split File" to start. Download each part individually, or save all parts as a single ZIP.

Features

Handles multi-GB files

Multi-GB CSV files that Excel cannot open are split without freezing your browser. Files are processed in small chunks instead of loading everything into memory at once.

Complete Client-Side Processing

Files are never sent to a server. All processing runs in your browser, so customer lists, sales records, and other sensitive CSVs stay on your device.

Binary Parsing — No Garbled Text

Supports UTF-8, ANSI, Shift-JIS, and more. The tool copies raw bytes from the original file without converting encoding, so the output is never garbled.

Handles Newlines Inside Quoted Fields

Newlines, commas, or double quotes inside a cell are preserved correctly. Rows stay intact across all split files (RFC 4180 compliant).

Auto Header & BOM Preservation

Automatically add header rows to the 2nd and subsequent files. Also preserves BOM for UTF-8 files to prevent garbled text in Excel.

Two Split Modes

Split by a fixed row count per file, or split into a set number of equal parts. Switch modes to fit your workflow.

Ideal For

Database Imports & System Migrations

Split exported CSVs into sizes your target system accepts, keeping headers in every file for direct import.

CSVs That Exceed Excel's 1M Row Limit

Break a multi-million-row CSV into parts that Excel or Google Sheets can open, filter, and pivot.

Confidential Data — No Server Upload

Customer lists, sales records, HR data — split them in your browser without sending a single byte to a server.

Encoding-Safe CSV Splitting (UTF-8 BOM, ANSI, etc.)

The tool copies raw bytes without converting encoding. Split files open cleanly in Excel without text corruption.

FAQ
Can I split a multi-GB CSV file?
Yes. The file is parsed in small chunks instead of loading everything into memory, so even multi-GB files won't freeze your browser.
Will text get garbled when opening split files in Excel?
No. The tool copies raw bytes from the original file without converting encoding. If the file has a UTF-8 BOM, every split file keeps it.
Will it accidentally split inside a "newline" within the data?
No. Newlines inside double-quoted fields are treated as cell data, not row delimiters, so your rows stay intact.
Are uploaded files saved on the server?
No, data is never sent to the server. All processing is completed within your browser, making it safe for files containing confidential information.
What if I get an error during Bulk Download?
Zipping very large results may exceed the browser's memory limit. If this happens, download each part individually.
Can I use it on smartphones or tablets?
Yes, you can. It works directly in mobile browsers like Safari and Chrome. Bulk downloaded ZIP files can be extracted using standard file apps.
Does it support multi-line headers?
Yes. Turn on "Add header to 2nd file onwards" and set the number of header rows. Even if your CSV has a 2- or 3-row header, that exact count is added to the top of each split file.
Do I need Python, PowerShell, or any command-line tool?
No. Just select your file, set the row count, and click Split. No coding, scripting, or software installation is required. It runs entirely in your browser on any OS — Windows, Mac, or Linux.
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