Does it support multi-line headers?

Yes, it does. By turning on the "Add header from 2nd file" option, you can freely change the number of header rows. Even if your CSV has 2 or 3 rows of headers, the exact specified number of rows will be accurately added to the top of each split file.

CSV Split Tool

Free, browser-based tool for splitting giant CSV files

How to Use

CSV Split Tool

A free tool to split CSV files by rows or number of files. Even multi-GB files that won't open in Excel are processed smoothly in your browser. No server uploads or registration required, safely split files without garbled text regardless of the character encoding.

How to Use

STEP1

Upload CSV File

Drag and drop the CSV file you want to split, or load it via the file selection button. Supports huge files of several GBs.

STEP2

Specify Split Options

Select the split mode ("Rows" or "Files") and enter the desired number. Also, turn on the "Add header from 2nd file" switch if necessary.

STEP3

Split and Download

Click the "Split File" button to parse the file instantly. Use the "Download" button for each part or use "Bulk Download".

Features

Handles multi-GB files

Thanks to our unique chunk processing algorithm, even heavy CSV files of several GBs can be parsed and split quickly without crashing the browser.

Complete Client-Side Processing

Uploaded files are never sent to a server. All processing is completed within your browser, making it safe for CSVs containing confidential data.

Binary Parsing without Garbled Text

Supports various character encodings like UTF-8 and ANSI. By safely processing as raw binary data, there is no need to worry about garbled text for major encodings.

Supports Newlines Inside Quotes

RFC 4180 compliant. Accurately determines newlines, commas, and double quotes within cells, splitting the CSV without breaking its structure.

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.

Ideal For

System Migration Managers

Split large exported CSV data from databases into manageable sizes for importing into other systems.

Data Analysts

Cut heavy CSV files that exceed Excel or Spreadsheet row limits (approx. 1 million rows) into easy-to-handle sizes.

Security-Conscious Companies

Process CSVs containing confidential company data safely at hand (in-browser) without uploading to a server.

Those Struggling with Garbled Text

Process files with diverse character encodings like ANSI or Windows-1252 directly without worrying about garbled text.

FAQ

Is it okay to upload a CSV file of several GBs?

Yes. Our tool does not load the entire file into memory at once. It parses it in small chunks, so even huge files will not freeze your browser.

Will the split CSV files be garbled when opened in Excel?

No, it will not be garbled. Garbling typically occurs when general tools unintentionally convert character encodings while reading files as text. Our tool uses a unique technology that extracts and saves the exact byte array (binary) of the original file. Furthermore, if the original file contains a BOM, that BOM information is perfectly preserved and carried over to each split file.

Will it accidentally split inside a "newline" within the data?

No, it will not be incorrectly split. The tool strictly parses data character by character internally. It implements advanced logic where "any newline appearing between opening and closing double quotes is treated as part of the data, not a row delimiter."

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?

Attempting to bulk download (ZIP) an extremely large file exceeding 2GB may cause an error due to the browser's memory limit. In such cases, please save each file one by one using the individual "Download" buttons.

Can I use it on smartphones or tablets?

Yes, you can. It works seamlessly on mobile browsers like Safari and Chrome. Bulk downloaded ZIP files can be extracted using standard file apps.

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